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Chaptewr 5 Special Occupancies | 506.6 | For the purposes of testing, approval, and area classification, various air mixtures (not oxygen enriched) shall be grouped as follows: Group IIIC: Combustible metal dust, including combustible metal fibers/flyings. [499:3.3.8.2.1]Group IIIB: Combustible dust other than combustible metal dust. [499:3.3.8.2.2]Group IIIA: Combustible fibers/flyings or ignitible fibers/flyings other than metal. [499:3.3.8.2.3]Informational Note No. 1: Group IIIA materials are larger particle-size Group IIIB materials and do not include metal dust or metal fibers/flyings. [499:A.3.3.8.2.3]Informational Note No. 2: Examples of ignitible fibers/flyings include rayon, cotton (including cotton linters and cotton waste), sisal, jute, hemp, cocoa fiber, oakum, and baled waste kapok.Informational Note No. 3: Combustible fibers/flyings include flat platelet-shaped particulates, such as metal flakes, and fibrous board, such as particle board. [506.6](https://2023.antflix.net#506.6) | https://2023.antflix.net#506.6 |
Chaptewr 5 Special Occupancies | 506.7 | This article shall require equipment construction and installation that ensures safe performance under conditions of proper use and maintenance. [506.7](https://2023.antflix.net#506.7) | https://2023.antflix.net#506.7 |
Chaptewr 5 Special Occupancies | 506.7(A) | Classification of areas, engineering and design, selection of equipment and wiring methods, installation, and inspection shall be performed by qualified persons. [506.7(A)](https://2023.antflix.net#506.7(A)) | https://2023.antflix.net#506.7(A) |
Chaptewr 5 Special Occupancies | 506.7(B) | In instances of areas within the same facility classified separately, Zone 22 locations shall be permitted to abut, but not overlap, Class II or Class III, Division 2 locations. Zone 20 or Zone 21 locations shall not abut Class II or Class III, Division 1 or Division 2 locations. [506.7(B)](https://2023.antflix.net#506.7(B)) | https://2023.antflix.net#506.7(B) |
Chaptewr 5 Special Occupancies | 506.7(C) | A Class II or Class III, Division 1 or Division 2 location shall be permitted to be reclassified as a Zone 20, Zone 21, or Zone 22 location if all of the space that is classified because of a single combustible dust, combustible fiber/flying, or ignitible fiber/flying source is reclassified under the requirements of this article. [506.7(C)](https://2023.antflix.net#506.7(C)) | https://2023.antflix.net#506.7(C) |
Chaptewr 5 Special Occupancies | 506.7(D) | Where flammable gases, combustible dusts, combustible fibers/flyings, or ignitible fibers/flyings are or might be present at the same time, the simultaneous presence shall be considered during the selection and installation of the electrical equipment and the wiring methods, including the determination of the safe operating temperature of the electrical equipment. [506.7(D)](https://2023.antflix.net#506.7(D)) | https://2023.antflix.net#506.7(D) |
Chaptewr 5 Special Occupancies | 506.8 | Acceptable protection techniques for electrical and electronic equipment in hazardous (classified) locations shall be as described in 506.8(A) through (P). Informational Note No. 1: See ANSI/UL 120101, Definitions and Information Pertaining to Electrical Equipment in Hazardous Locations; and ANSI/UL 60079-0, Explosive Atmospheres - Part 0: Equipment - General Requirements, for additional information. Informational Note No. 2: See Chapter 9, Table 13 for descriptions of subdivisions of protection techniques. [506.8](https://2023.antflix.net#506.8) | https://2023.antflix.net#506.8 |
Chaptewr 5 Special Occupancies | 506.8(A) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, and Zone 22 locations for which it is identified. [506.8(A)](https://2023.antflix.net#506.8(A)) | https://2023.antflix.net#506.8(A) |
Chaptewr 5 Special Occupancies | 506.8(B) | This protection technique shall be permitted for equipment in Zone 21 and Zone 22 locations for which it is identified. [506.8(B)](https://2023.antflix.net#506.8(B)) | https://2023.antflix.net#506.8(B) |
Chaptewr 5 Special Occupancies | 506.8(C) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, and Zone 22 locations for which it is identified. [506.8(C)](https://2023.antflix.net#506.8(C)) | https://2023.antflix.net#506.8(C) |
Chaptewr 5 Special Occupancies | 506.8(D) | This protection technique shall be permitted for equipment in Zone 22 locations for which it is identified. [506.8(D)](https://2023.antflix.net#506.8(D)) | https://2023.antflix.net#506.8(D) |
Chaptewr 5 Special Occupancies | 506.8(E) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, and Zone 22 locations for which it is identified. [506.8(E)](https://2023.antflix.net#506.8(E)) | https://2023.antflix.net#506.8(E) |
Chaptewr 5 Special Occupancies | 506.8(F) | This protection technique shall be permitted for equipment in Zone 22 locations for which it is identified. [506.8(F)](https://2023.antflix.net#506.8(F)) | https://2023.antflix.net#506.8(F) |
Chaptewr 5 Special Occupancies | 506.8(G) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, and Zone 22 locations for which it is identified. [506.8(G)](https://2023.antflix.net#506.8(G)) | https://2023.antflix.net#506.8(G) |
Chaptewr 5 Special Occupancies | 506.8(H) | This protection technique shall be permitted for equipment in Zone 21 and Zone 22 locations for which it is identified. [506.8(H)](https://2023.antflix.net#506.8(H)) | https://2023.antflix.net#506.8(H) |
Chaptewr 5 Special Occupancies | 506.8(I) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, and Zone 22 locations for which it is listed. [506.8(I)](https://2023.antflix.net#506.8(I)) | https://2023.antflix.net#506.8(I) |
Chaptewr 5 Special Occupancies | 506.8(J) | This protection technique shall be permitted for electrical resistance trace heating equipment in Zone 21 or Zone 22 for which it is listed. [506.8(J)](https://2023.antflix.net#506.8(J)) | https://2023.antflix.net#506.8(J) |
Chaptewr 5 Special Occupancies | 506.8(K) | This protection technique shall be permitted for equipment in Zone 20, 21, or 22 locations for which the equipment is identified. [506.8(K)](https://2023.antflix.net#506.8(K)) | https://2023.antflix.net#506.8(K) |
Chaptewr 5 Special Occupancies | 506.8(L) | This protection technique shall be permitted for equipment in Zone 21 or 22 locations for which the equipment is identified. [506.8(L)](https://2023.antflix.net#506.8(L)) | https://2023.antflix.net#506.8(L) |
Chaptewr 5 Special Occupancies | 506.8(M) | This protection technique shall be permitted for equipment in Zone 20, 21, or 22 locations for which the equipment is identified. [506.8(M)](https://2023.antflix.net#506.8(M)) | https://2023.antflix.net#506.8(M) |
Chaptewr 5 Special Occupancies | 506.8(N) | This protection technique shall be permitted for skin effect trace heating equipment in Zone 21 or Zone 22 for which it is listed. [506.8(N)](https://2023.antflix.net#506.8(N)) | https://2023.antflix.net#506.8(N) |
Chaptewr 5 Special Occupancies | 506.8(O) | This protection technique shall be permitted in Zone 21 and Zone 22 locations for which it is identified. [506.8(O)](https://2023.antflix.net#506.8(O)) | https://2023.antflix.net#506.8(O) |
Chaptewr 5 Special Occupancies | 506.8(P) | This protection technique shall be permitted for equipment in Zone 20, Zone 21, or Zone 22 locations for which they are listed. [506.8(P)](https://2023.antflix.net#506.8(P)) | https://2023.antflix.net#506.8(P) |
Chaptewr 5 Special Occupancies | 506.9(A) | Suitability of identified equipment shall be determined by one of the following: Equipment listing or labelingEvidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned with product evaluationEvidence acceptable to the authority having jurisdiction such as a manufacturer's self-evaluation or an owner's engineering judgmentInformational Note: Additional documentation for equipment might include certificates demonstrating compliance with applicable equipment standards, indicating special conditions of use, and other pertinent information. [506.9(A)](https://2023.antflix.net#506.9(A)) | https://2023.antflix.net#506.9(A) |
Chaptewr 5 Special Occupancies | 506.9(B) | Equipment that is listed for Zone 20 shall be permitted in a Zone 21 or Zone 22 location of the same combustible dust, combustible fiber/flying, or ignitible fiber/flying. Equipment that is listed for Zone 21 shall be permitted in a Zone 22 location of the same combustible dust, combustible fiber/flying, or ignitible fiber/flying. [506.9(B)](https://2023.antflix.net#506.9(B)) | https://2023.antflix.net#506.9(B) |
Chaptewr 5 Special Occupancies | 506.9(C)(1) | Equipment identified for Class II, Division 1, Class II, Division 2, Class III, Division 1, or Class III, Division 2 shall, in addition to being marked in accordance with 500.8(C), be permitted to be marked with all of the following: Zone 20, 21, or 22 (as applicable)Material group in accordance with 506.6Maximum surface temperature in accordance with 506.9(D), marked as a temperature value in degrees C, preceded by "T" and followed by the symbol "°C" [506.9(C)(1)](https://2023.antflix.net#506.9(C)(1)) | https://2023.antflix.net#506.9(C)(1) |
Chaptewr 5 Special Occupancies | 506.9(C)(2) | Equipment meeting one or more of the protection techniques described in 506.8 shall be marked with the following in the order shown: Zone in accordance with Chapter 9, Table 13Symbol "AEx"Protection technique(s) in accordance with Chapter 9, Table 13Material group in accordance with 506.6Maximum surface temperature in accordance with 506.9(D), marked as a temperature value in degrees Celsius, preceded by "T" and followed by the symbol "°C"Ambient temperature marking in accordance with 506.9(D)Equipment protection level (EPL)Informational Note: EPLs are designated as G for gas, or D for dust, and are then followed by a letter (a, b, or c) to give the user a better understanding as to whether the equipment provides (a) a "very high," (b) a "high," or (c) an "enhanced" level of protection against ignition of an explosive atmosphere. For example, a Zone 21 AEx pb IIIB T165°C Db motor is marked with an EPL of "Db".Exception: Associated apparatus NOT suitable for installation in a hazardous (classified) location shall be required, to be marked only with 506.9(C)(2)(2) and (C)(2)(3), and where applicable (C)(2)(4), but BOTH the symbol AEx in 506.9(C)(2)(2) and the symbol for the type of protection in 506.9(C)(2)(3) shall be enclosed within the same square brackets; for example, [AEx ia] IIIC. [506.9(C)(2)](https://2023.antflix.net#506.9(C)(2)) | https://2023.antflix.net#506.9(C)(2) |
Chaptewr 5 Special Occupancies | 506.9(D) | Equipment shall be marked to show the maximum surface temperature referenced to a 40°C ambient, or at the higher marked ambient temperature if the equipment is rated and marked for an ambient temperature of greater than 40°C. For equipment installed in a Zone 20 or Zone 21 location, the operating temperature shall be based on operation of the equipment when blanketed with the maximum amount of dust (or with dust-simulating fibers/flyings) that can accumulate on the equipment. Electrical equipment designed for use in the ambient temperature range between -20°C and +40°C shall require no additional ambient temperature marking. Electrical equipment that is designed for use in a range of ambient temperatures other than -20°C and +40°C is considered to be special, and the ambient temperature range shall then be marked on the equipment, including either the symbol "Ta" or "Tamb" together with the special range of ambient temperatures. Informational Note: As an example, such a marking might be 30°C < Ta < +40°C." Exception No. 1: Equipment of the non-heat-producing type, such as conduit fittings, shall not be required to have a marked operating temperature. Exception No. 2: Equipment identified for Class II, Division 1 or Class II, Division 2 locations as permitted by 506.20(B) and (C) shall be permitted to be marked in accordance with 500.8(C) and Table 500.8(C)(4). [506.9(D)](https://2023.antflix.net#506.9(D)) | https://2023.antflix.net#506.9(D) |
Chaptewr 5 Special Occupancies | 506.9(E) | The supply connection entry thread form shall be NPT or metric. Conduit and fittings shall be made wrench-tight to prevent sparking when the fault current flows through the conduit system and to ensure the integrity of the conduit system. Equipment provided with threaded entries for field wiring connections shall be installed in accordance with 506.9(E)(1) or (E)(2) and with (E)(3). [506.9(E)](https://2023.antflix.net#506.9(E)) | https://2023.antflix.net#506.9(E) |
Chaptewr 5 Special Occupancies | 506.9(E)(1) | For equipment provided with threaded entries for NPT-threaded conduit or fittings, listed conduit fittings or listed cable fittings shall be used. All NPT-threaded conduit and fittings shall be threaded with a National (American) Standard Pipe Taper (NPT) thread. Informational Note: See ASME B1.20.1, Pipe Threads, General Purpose (Inch), for thread specifications for NPT threads. [506.9(E)(1)](https://2023.antflix.net#506.9(E)(1)) | https://2023.antflix.net#506.9(E)(1) |
Chaptewr 5 Special Occupancies | 506.9(E)(2) | For equipment with metric-threaded entries, listed conduit fittings or listed cable fittings shall be used. Such entries shall be identified as being metric, or listed adapters to permit connection to conduit or NPT-threaded fittings shall be provided with the equipment and shall be used for connection to conduit or NPT-threaded fittings. Metric-threaded fittings installed into equipment entries shall be made up with at least five threads fully engaged. [506.9(E)(2)](https://2023.antflix.net#506.9(E)(2)) | https://2023.antflix.net#506.9(E)(2) |
Chaptewr 5 Special Occupancies | 506.9(E)(3) | All unused openings shall be closed with blanking elements or close-up plugs that are listed for the location and will maintain the type of protection. Thread engagement shall comply with the requirements of 506.9(E)(1) or (E)(2). [506.9(E)(3)](https://2023.antflix.net#506.9(E)(3)) | https://2023.antflix.net#506.9(E)(3) |
Chaptewr 5 Special Occupancies | 506.9(F) | An optical fiber cable, with or without current-carrying conductors (hybrid optical fiber cable), shall be installed to address the associated fire hazard and sealed to address the associated explosion hazard in accordance with 506.15 and 506.16. [506.9(F)](https://2023.antflix.net#506.9(F)) | https://2023.antflix.net#506.9(F) |
Chaptewr 5 Special Occupancies | 506.9(G) | For equipment involving sources of optical radiation (such as laser or LED sources) in the wavelength range from 380 nm to 10 pm, the risk of ignition from optical radiation shall be considered for all electrical parts and circuits that might be exposed to the radiation, both inside and outside the optical equipment. This includes optical equipment, which itself is located outside the explosive atmosphere but its emitted optical radiation enters such atmospheres. Informational Note: See ANSI/UL 60079-28, Explosive Atmospheres - Part 28: Protection of Equipment and Transmission Systems Using Optical Radiation, for information on types of protection that can be applied to minimize the risk of ignition in explosive atmospheres from optical radiation. Exception: All luminaires (fixed, portable, or transportable) and hand lights intended to be supplied by mains (with or without galvanic isolation) or powered by batteries, with any continuous divergent light source, including LEDs, shall be excluded from this requirement. [506.9(G)](https://2023.antflix.net#506.9(G)) | https://2023.antflix.net#506.9(G) |
Chaptewr 5 Special Occupancies | 506.15 | Wiring methods shall maintain the integrity of the protection techniques and shall comply with 506.15(A), (B), or (C). Informational Note: See Article 100 for the definition of restricted industrial establishment [as applied to hazardous (classified) locations]. [506.15](https://2023.antflix.net#506.15) | https://2023.antflix.net#506.15 |
Chaptewr 5 Special Occupancies | 506.15(A) | In Zone 20 locations, the following wiring methods shall be permitted: Threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC).Type MI cable terminated with fittings listed for the location. Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.Exception No. 1: Type MI cable and fittings listed for Class II, Division 1 locations shall be permitted to be used.Exception No. 2: Equipment identified as intrinsically safe "ia" shall be permitted to be connected using the wiring methods identified in 504.20.In restricted industrial establishments, Type MC-HL cable listed for use in Zone 20 locations, with a continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, and a separate equipment grounding conductor(s) in accordance with 250.122, and terminated with fittings listed for the application. Type MC-HL cable shall be installed in accordance with Part II of Article 330.Exception: Type MC-HL cable and fittings listed for Class II, Division 1 locations shall be permitted to be used.In restricted industrial establishments, and where the cable is not subject to physical damage, Type ITC-HL cable listed for use in Zone 1 or Class I, Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material, and terminated with fittings listed for the application. Type ITC-HL cable shall be installed in accordance with 335.4.Fittings and boxes shall be identified for use in Zone 20 locations.Exception: Boxes and fittings listed for Class II, Division 1 locations shall be permitted to be used.If flexible connections are necessary, liquidtight flexible metal conduit (LFMC) with listed fittings, liquidtight flexible nonmetallic conduit (LFNC) with listed fittings, or flexible cord listed for extra-hard usage and provided with listed fittings. Where flexible cords are used, they shall also comply with 506.17 and be terminated with a listed cord connector that maintains the type of protection of the terminal compartment. If flexible connections are subject to oil or other corrosive conditions, the insulation of the conductors shall be of a type listed for the condition or be protected by means of a suitable sheath.Exception No. 1: Liquidtight flexible conduit (LFMC or LFNC), flexible conduit fittings, and cord fittings listed for Class II, Division 1 locations shall be permitted.Exception No. 2: For elevator use, an identified elevator cable of Type EO, Type ETP, or Type ETT, shown under the "use" column in Table 400.4 for "hazardous (classified) locations," and terminated with listed connectors that maintain the type of protection of the terminal compartment shall be permitted.Informational Note No. 1: See 506.30 for grounding requirements where flexible conduit is used.Informational Note No. 2: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cables, cable fittings, and cord connectors.Optical fiber cable Type OFNP, Type OFCP, Type OFNR, Type OFCR, Type OFNG, Type OFCG, Type OFN, or Type OFC installed in raceways in accordance with 506.15(A). Optical fiber cables shall be sealed in accordance with 506.16. [506.15(A)](https://2023.antflix.net#506.15(A)) | https://2023.antflix.net#506.15(A) |
Chaptewr 5 Special Occupancies | 506.15(B) | In Zone 21 locations, the following wiring methods shall be permitted: All wiring methods permitted in 506.15(A)Fittings and boxes that are dusttight, that are provided with threaded bosses for connection to conduit, and in which taps, joints, or terminal connections are not made and are not used in locations where metal dust is presentInformational Note: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cables, cable fittings, and cord connectors.Exception: Equipment identified as intrinsically safe "ib" shall be permitted to be connected using the wiring methods identified in 504.20. [506.15(B)](https://2023.antflix.net#506.15(B)) | https://2023.antflix.net#506.15(B) |
Chaptewr 5 Special Occupancies | 506.15(C) | In Zone 22 locations, the following wiring methods shall be permitted: All wiring methods permitted in 506.15(B).Rigid metal conduit (RMC) or intermediate metal conduit (IMC) with listed threaded or threadless fittings.Electrical metallic tubing (EMT) or dusttight wireways.Type MC or Type MI cable with listed termination fittings.Type PLTC cable or Type PLTC-ER cable used in Class 2 or Class 3 circuits, including installation in cable tray systems. The cable shall be terminated with listed fittings. Type PLTC-ER cable shall include an equipment grounding conductor in addition to a drain wire that might be present.Type ITC cable or Type ITC-ER cable as permitted in 335.4 and terminated with listed fittings. Type ITC-ER cable shall include an equipment grounding conductor in addition to a drain wire.Type MV, Type TC, or Type TC-ER cable, including installation in cable tray systems. Type TC-ER cable shall include an equipment grounding conductor in addition to a drain wire that might be present. The cable shall be terminated with listed fittings.Intrinsic safety type of protection "ic" using any of the wiring methods permitted for unclassified locations. Intrinsic safety type of protection "ic" systems shall be installed in accordance with the control drawing(s). Simple apparatus, not shown on the control drawing, shall be permitted in a circuit of intrinsic safety type of protection "ic", provided that the simple apparatus does not interconnect the intrinsic safety type of protection "ic" circuit to any other circuit. Separation of circuits of intrinsic safety type of protection "ic" shall be in accordance with one of the following:Be in separate cablesBe in multiconductor cables where the conductors of each circuit are within a grounded metal shieldBe in multiconductor cables where the conductors have insulation with a minimum thickness of 0.25 mm (0.01 in.)Informational Note: See Article 100 for the definition of simple apparatus.Boxes and fittings shall be dusttight.Optical fiber cable Type OFNP, Type OFCP, Type OFNR, Type OFCR, Type OFNG, Type OFCG, Type OFN, or Type OFC installed in cable trays or any raceway in accordance with 506.15(C). Optical fiber cables shall be sealed in accordance with 506.16.Cablebus. [506.15(C)](https://2023.antflix.net#506.15(C)) | https://2023.antflix.net#506.15(C) |
Chaptewr 5 Special Occupancies | 506.16 | Where necessary to protect against the ingress of combustible dust, combustible fibers/flyings, or ignitible fibers/flyings, or to maintain the type of protection, seals shall be provided. The seal shall be identified as capable of preventing the ingress of combustible dust, combustible fiber/flying, or ignitible fiber/flying and maintaining the type of protection but need not be explosionproof or flameproof. [506.16](https://2023.antflix.net#506.16) | https://2023.antflix.net#506.16 |
Chaptewr 5 Special Occupancies | 506.17 | Flexible cords used in Zone 20, Zone 21, and Zone 22 locations shall comply with all of the following: Be of a type listed for extra-hard usageContain, in addition to the conductors of the circuit, an equipment grounding conductor complying with 400.23Be connected to terminals or to supply conductors in an approved mannerBe supported by clamps or by other suitable means in such a manner to minimize tension on the terminal connectionsBe terminated with a listed cord connector that maintains the protection technique of the terminal compartmentInformational Note: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cables, cable fittings, and cord connectors. [506.17](https://2023.antflix.net#506.17) | https://2023.antflix.net#506.17 |
Chaptewr 5 Special Occupancies | 506.20(A) | In Zone 20 locations, only equipment listed and marked as suitable for the location shall be permitted. Exception No. 1: Equipment listed for use in Class II, Division 1 locations with a suitable temperature class shall be permitted. Exception No. 2: For locations involving Group IIIA materials, equipment listed for use in Class III, Division 1 locations with a suitable temperature in accordance with 500.8(D)(3) shall be permitted. [506.20(A)](https://2023.antflix.net#506.20(A)) | https://2023.antflix.net#506.20(A) |
Chaptewr 5 Special Occupancies | 506.20(B) | In Zone 21 locations, only equipment listed and marked as suitable for the location shall be permitted. Exception No. 1: Apparatus listed for use in Class II, Division 1 locations with a suitable temperature class shall be permitted. Exception No. 2: Pressurized equipment identified for Class II, Division 1 shall be permitted. Exception No. 3: For locations involving Group IIIA materials, equipment listed for use in Class III, Division 1 locations with a suitable temperature in accordance with 500.8(D)(3) shall be permitted. [506.20(B)](https://2023.antflix.net#506.20(B)) | https://2023.antflix.net#506.20(B) |
Chaptewr 5 Special Occupancies | 506.20(C) | In Zone 22 locations, only equipment listed and marked as suitable for the location shall be permitted. Exception No. 1: Apparatus listed for use in Class II, Division 1 or Class II, Division 2 locations with a suitable temperature class shall be permitted. Exception No. 2: Pressurized equipment identified for Class II, Division 1 or Division 2 shall be permitted. Exception No. 3: For Group IIIA materials, equipment listed for use in Class III, Division 1 or Class III, Division 2 locations with a suitable temperature in accordance with 500.8(D)(3) shall be permitted. [506.20(C)](https://2023.antflix.net#506.20(C)) | https://2023.antflix.net#506.20(C) |
Chaptewr 5 Special Occupancies | 506.20(D) | Equipment marked Group IIIC shall be permitted for applications requiring Group IIIA or Group IIIB equipment. Similarly, equipment marked Group IIIB shall be permitted for applications requiring Group IIIA equipment. [506.20(D)](https://2023.antflix.net#506.20(D)) | https://2023.antflix.net#506.20(D) |
Chaptewr 5 Special Occupancies | 506.20(E) | Electrical equipment installed in hazardous (classified) locations shall be installed in accordance with the manufacturer's instructions, if provided. [506.20(E)](https://2023.antflix.net#506.20(E)) | https://2023.antflix.net#506.20(E) |
Chaptewr 5 Special Occupancies | 506.20(F) | The temperature marking specified in 506.9(C)(2)(5) shall comply with 506.20(F)(1) or (F)(2): Combustible dusts or combustible fibers/flyings shall be less than the lower of either the layer or cloud ignition temperature of the specific combustible dust or combustible fiber/flying. For nonmetal dusts or nonmetal combustible fibers/flyings that might dehydrate or carbonize, the temperature marking shall not exceed the lower of either the ignition temperature or 165°C (329°F).For ignitible fibers/flyings, less than 165°C (329°F) for equipment that is not subject to overloading, or 120°C (248°F) for equipment (such as motors or power transformers) that may be overloaded.Informational Note: See NFPA 499, Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, for minimum ignition temperatures of specific dusts. [506.20(F)](https://2023.antflix.net#506.20(F)) | https://2023.antflix.net#506.20(F) |
Chaptewr 5 Special Occupancies | 506.30 | Regardless of the voltage of the electrical system, wiring systems and equipment shall comply with 506.30(A) and (B). [506.30](https://2023.antflix.net#506.30) | https://2023.antflix.net#506.30 |
Chaptewr 5 Special Occupancies | 506.30(A) | Wiring systems and equipment shall be grounded in accordance with Part I and Part VI of Article 250, as applicable. [506.30(A)](https://2023.antflix.net#506.30(A)) | https://2023.antflix.net#506.30(A) |
Chaptewr 5 Special Occupancies | 506.30(B) | Bonding shall comply with Part I and Part V of Article 250, as applicable, and 506.30(B)(1) and (B)(2). [506.30(B)](https://2023.antflix.net#506.30(B)) | https://2023.antflix.net#506.30(B) |
Chaptewr 5 Special Occupancies | 506.30(B)(1) | Bonding shall comply with 506.30(B)(1)(a) and (B)(1)(b). The locknut-bushing and double-locknut types of contacts shall not be depended on for bonding purposes, but bonding jumpers with identified fittings or other approved means of bonding shall be used. These bonding means shall apply to all metal raceways, fittings, boxes, cable trays, and enclosures, and other parts of raceway systems between hazardous (classified) locations and the point of grounding for service equipment or point of grounding for a separately derived system. Metal struts, angles, or channels provided for support and mechanical or physical protection as permitted in 335.4(5), 336.10(7)(c), or 722.135(C) shall be bonded in accordance with 250.102.Where the branch-circuit overcurrent protection is located on the load side of the disconnecting means, the specific bonding means shall be permitted to end at the nearest point where the grounded circuit conductor and the grounding electrode conductor are connected together on the line side of the building or structure disconnecting means as specified in 250.32(B). [506.30(B)(1)](https://2023.antflix.net#506.30(B)(1)) | https://2023.antflix.net#506.30(B)(1) |
Chaptewr 5 Special Occupancies | 506.30(B)(2) | Liquidtight flexible metal conduit shall comply with 506.30(B)(2)(a) and (B)(2)(b). Liquidtight flexible metal conduit shall include an equipment bonding jumper of the wire type in accordance with 250.102.In Zone 22 locations, the bonding jumper shall not be required where all of the following conditions are met:Listed liquidtight flexible metal conduit 1.8 m (6 ft) or less in length, with fittings listed for grounding, is used.Overcurrent protection in the circuit is limited to 10 amperes or less.The load is part of a meter, instrument, or relay circuit. [506.30(B)(2)](https://2023.antflix.net#506.30(B)(2)) | https://2023.antflix.net#506.30(B)(2) |
Chaptewr 5 Special Occupancies | 511.1 | These occupancies shall include locations used for service and repair operations in connection with self-propelled vehicles (including, but not limited to, passenger automobiles, buses, trucks, and tractors) in which volatile flammable liquids or flammable gases are used for fuel or power. Informational Note: See NFPA 30A-2021, Code for Motor Fuel Dispensing Facilities and Repair Garages, for extracted text that is followed by a reference in brackets. Only editorial changes were made to the extracted text to make it consistent with this Code. [511.1](https://2023.antflix.net#511.1) | https://2023.antflix.net#511.1 |
Chaptewr 5 Special Occupancies | 511.2 | In addition to the requirements of this article, these occupancies shall comply with Table 511.2, as applicable, except as modified by this article. Table 511.2 Other Articles Requirement Division Classified Locations Zone Classified Locations Area classification 500.5, 500.6 505.5, 505.6, 505.7 Equipment Part III of 501, 505.8, 505.9, 500.7, 500.8, 501.5 505.20, 505.22 Wiring Part II of 501 505.15, 505.16, 505.17, 505.18, 505.19, 505.26, 505.30 [511.2](https://2023.antflix.net#511.2) | https://2023.antflix.net#511.2 |
Chaptewr 5 Special Occupancies | 511.3 | Where Class I liquids or gaseous fuels are stored, handled, or transferred, electrical wiring and electrical utilization equipment shall be designed in accordance with the requirements for Class I, Division 1 or 2 hazardous (classified) locations as classified in accordance with 500.5 and 500.6, and this article. A Class I location shall not extend beyond an unpierced wall, roof, or other solid partition that has no openings. [30A:8.3.1, 8.3.3] Where the term "Class I" is used with respect to Zone classifications within this article of the Code, it shall apply to Zone 0, Zone 1, and Zone 2 designations. Informational Note: The term "Class I" was originally included as a prefix to Zone 0, Zone 1, and Zone 2 locations and references as an identifier for flammable gases, vapors, or liquids to differentiate from Class II and Class III locations. Zone 0, Zone 1, and Zone 2 only apply to flammable gases, vapors, or liquids so the "Class I" prefix is redundant and has been deleted, except for text that is extracted from other documents or to remain consistent throughout this article. [511.3](https://2023.antflix.net#511.3) | https://2023.antflix.net#511.3 |
Chaptewr 5 Special Occupancies | 511.3(A) | Parking garages used for parking or storage shall be permitted to be unclassified. Informational Note: See NFPA 88A, Standard for Parking Structures, and NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, for additional information. [511.3(A)](https://2023.antflix.net#511.3(A)) | https://2023.antflix.net#511.3(A) |
Chaptewr 5 Special Occupancies | 511.3(B) | Major and minor repair garages that dispense motor fuels into the fuel tanks of vehicles, including flammable liquids having a flash point below 38°C (100°F) such as gasoline, or gaseous fuels such as natural gas, hydrogen, or LPG, shall have the dispensing functions and components classified in accordance with Table 514.3(B)(1) in addition to any classification required by this section. Where Class I liquids, other than fuels, are dispensed, the area within 900 mm (3 ft) of any fill or dispensing point, extending in all directions, shall be a Class I, Division 2 location. [511.3(B)](https://2023.antflix.net#511.3(B)) | https://2023.antflix.net#511.3(B) |
Chaptewr 5 Special Occupancies | 511.3(C) | Where vehicles using Class I liquids or heavier-than-air gaseous fuels (such as LPG) are repaired, hazardous area classification shall be in accordance with Table 511.3(C). Informational Note: See NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, Table 8.3.2, for additional information. [511.3(C)](https://2023.antflix.net#511.3(C)) | https://2023.antflix.net#511.3(C) |
Chaptewr 5 Special Occupancies | 511.3(D) | Where vehicles using lighter-than-air gaseous fuels (such as hydrogen and natural gas) are repaired or stored, hazardous area classification shall be in accordance with Table 511.3(D). Informational Note: See NFPA 30A, Code for Motor Fuel Dispensing Facilities and Repair Garages, Table 8.3.2, for additional information. [511.3(D)](https://2023.antflix.net#511.3(D)) | https://2023.antflix.net#511.3(D) |
Chaptewr 5 Special Occupancies | 511.3(E)(1) | Areas adjacent to classified locations in which flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, shall be unclassified where mechanically ventilated at a rate of four or more air changes per hour, designed with positive air pressure, or separated by an unpierced wall, roof, or other solid partition. [511.3(E)(1)](https://2023.antflix.net#511.3(E)(1)) | https://2023.antflix.net#511.3(E)(1) |
Chaptewr 5 Special Occupancies | 511.3(E)(2) | The area used for storage, handling, or dispensing into motor vehicles of alcohol-based windshield washer fluid in repair garages shall be unclassified unless otherwise classified by a provision of 511.3. [30A: 8.3.1, Exception] Table 511.3(C) Extent of Classified Locations for Major and Minor Repair Garages with Heavier-Than-Air Fuel Location Class I Extent of Classified Location Division(Group D) Zone(Group IIA) Repair garage, major(where Class I liquids or gaseous fuels are transferred or dispensed*) 1 1 Entire space within any pit, belowgrade work area, or subfloor work area that is not ventilated 2 2 Entire space within any pit, belowgrade work area, or subfloor work area that is provided with ventilation of at least 0.3 m3/min/m2 (1 ft3/min/ft2) of floor area, with suction taken from a point within 300 mm (12 in.) of floor level 2 2 Up to 450 mm (18 in.) above floor level of the room, except as noted below, for entire floor area Unclassified Unclassified Up to 450 mm (18 in.) above floor level of the room where room is provided with ventilation of at least 0.3 m3/min/m2(1 ft3/min/ft2) of floor area, with suction taken from a point within 300 mm (12 in.) of floor level 2 2 Within 0.9 m (3 ft) of any fill or dispensing point, extending in all directions Specific areas adjacent to classified locations Unclassified Unclassified Areas adjacent to classified locations where flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, where mechanically ventilated at a rate of four or more air changes per hour or designed with positive air pressure or where effectively separated by walls or partitions Repair garage, minor(where Class I liquids or gaseous fuels are not transferred or dispensed*) 2 2 Entire space within any pit, belowgrade work area, or subfloor work area that is not ventilated 2 2 Up to 450 mm (18 in.) above floor level, extending 0.9 m (3 ft) horizontally in all directions from opening to any pit, belowgrade work area, or subfloor work area that is not ventilated Unclassified Unclassified Entire space within any pit, belowgrade work area, or subfloor work area that is provided with ventilation of at least 0.3 m3/min/m2 (1 ft3/min/ft2) of floor area, with suction taken from a point within 300 mm (12 in.) of floor level Specific areas adjacent to classified locations Unclassified Unclassified Areas adjacent to classified locations where flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, where mechanically ventilated at a rate of four or more air changes per hour or designed with positive air pressure or where effectively separated by walls or partitions *Includes draining of Class I liquids from vehicles. Table 511.3(D) Extent of Classified Locations for Major Repair Garages with Lighter-than-Air Fuel Location Class I Extent of Classified Location Division2 Zone3 Repair garage, major(where lighter-than-air gaseous fueled1 vehicles are repaired or stored) 2 2 Within 450 mm (18 in.) of ceiling, except as noted below Unclassified Unclassified Within 450 mm (18 in.) of ceiling where ventilation of at least 0.3 m3/min/m2(1 ft3/min/ft2) of floor area is provided, with suction taken from a point within 450 mm (18 in.) of the highest point in the ceiling Specific areas adjacent to classified locations Unclassified Unclassified Areas adjacent to classified locations where flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, where mechanically ventilated at a rate of four or more air changes per hour, designed with positive air pressure, or effectively separated by walls or partitions 1Includes fuels such as hydrogen and natural gas, but not LPG. 2For hydrogen (lighter than air) Group B, or natural gas Group D. 3For hydrogen (lighter than air) Group IIC or IIB+H2, or natural gas Group IIA. [511.3(E)(2)](https://2023.antflix.net#511.3(E)(2)) | https://2023.antflix.net#511.3(E)(2) |
Chaptewr 5 Special Occupancies | 511.4(A) | Wiring located within Class I locations as classified in 511.3 shall conform with the requirements of Part II of Article 501 or 504.20, as applicable. [511.4(A)](https://2023.antflix.net#511.4(A)) | https://2023.antflix.net#511.4(A) |
Chaptewr 5 Special Occupancies | 511.4(B) | Within Class I locations as defined in 511.3, equipment shall conform with the requirements of Part III of Article 501 or 504.10, as applicable. [511.4(B)](https://2023.antflix.net#511.4(B)) | https://2023.antflix.net#511.4(B) |
Chaptewr 5 Special Occupancies | 511.4(B)(1) | Where fuel-dispensing units (other than liquid petroleum gas, which is prohibited) are located within buildings, 514.1 shall apply. Where mechanical ventilation is provided in the dispensing area, the control shall be interlocked so that the dispenser cannot operate without ventilation, in accordance with 500.5(B)(2). [511.4(B)(1)](https://2023.antflix.net#511.4(B)(1)) | https://2023.antflix.net#511.4(B)(1) |
Chaptewr 5 Special Occupancies | 511.4(B)(2) | Portable lighting equipment shall be equipped with a handle, lampholder, hook, and substantial guard attached to the lampholder or handle. All exterior surfaces that might come in contact with battery terminals, wiring terminals, or other objects shall be of nonconducting material or shall be effectively protected with insulation. Lampholders shall be of an unswitched type and shall not provide means for plug-in of attachment plugs. The outer shell shall be of molded composition or other suitable material. Unless the lamp and its cord are supported or arranged in such a manner that they cannot be used in the locations classified in 511.3, they shall be of a type identified for Class I, Division 1 locations. [511.4(B)(2)](https://2023.antflix.net#511.4(B)(2)) | https://2023.antflix.net#511.4(B)(2) |
Chaptewr 5 Special Occupancies | 511.7(A)(1) | Fixed wiring above hazardous (classified) locations shall be permitted to be one or more of the following:Rigid metal conduit (RMC) or intermediate metal conduit (IMC) with listed threaded or threadless fittings, or electrical metallic conduit (EMT) with listed fittings.Rigid polyvinyl chloride conduit (PVC), reinforced thermosetting resin conduit (RTRC), or electrical nonmetallic tubing (ENT).Flexible metal conduit (FMC), liquidtight flexible metal conduit (LFMC), or liquidtight flexible nonmetallic conduit (LFNC), with listed fittings.Type MC cable, Type AC cable, Type TC cable, or Type TC-ER cable, including installation in cable trays. Type TC-ER cable shall include an equipment grounding conductor (EGC) in addition to any drain wire. All cable types shall have listed fittings.Type MI cable terminated with listed fittings and supported in a manner to avoid tensile stress.Manufactured wiring systems.Type PLTC cable or Type PLTC-ER cable in Class I, Class 2, or Class 3 circuits. Type PLTC-ER cable shall include an equipment grounding conductor (EGC) in addition to any drain wire.Type ITC cable or Type ITC-ER cable in accordance with 335.4 and 335.5, terminated with listed fittings. Type ITC-ER cable shall include an equipment grounding conductor (EGC) in addition to any drain wire.Cellular metal floor raceways or cellular concrete floor raceways only for supplying ceiling outlets or extensions to the area below the floor. Such raceways shall have no connections leading into or through any Class I location above the floor. [511.7(A)(1)](https://2023.antflix.net#511.7(A)(1)) | https://2023.antflix.net#511.7(A)(1) |
Chaptewr 5 Special Occupancies | 511.7(A)(2) | For pendants, flexible cord suitable for the type of service and listed for hard usage shall be used. [511.7(A)(2)](https://2023.antflix.net#511.7(A)(2)) | https://2023.antflix.net#511.7(A)(2) |
Chaptewr 5 Special Occupancies | 511.7(B)(1) | Electrical equipment in a fixed position shall be located above the level of any defined hazardous (classified) location or shall be identified for the location. Arcing Equipment. Equipment that is less than 3.7 m (12 ft) above the floor level and that might produce arcs, sparks, or particles of hot metal, such as cutouts, switches, charging panels, generators, motors, or other equipment (excluding receptacles, lamps, and lampholders) having make-and-break or sliding contacts, shall be of the totally enclosed type or constructed to prevent the escape of sparks or hot metal particles.Fixed Lighting. Lamps and lampholders for fixed lighting that is located over lanes through which vehicles are commonly driven or that might otherwise be exposed to physical damage shall be located not less than 3.7 m (12 ft) above floor level, unless of the totally enclosed type or constructed to prevent escape of sparks or hot metal particles. [511.7(B)(1)](https://2023.antflix.net#511.7(B)(1)) | https://2023.antflix.net#511.7(B)(1) |
Chaptewr 5 Special Occupancies | 511.8 | Underground wiring shall be installed in accordance with one of the following wiring methods: Threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC) with listed threaded fittings.Rigid polyvinyl chloride conduit (PVC), reinforced thermosetting resin conduit (RTRC), or high-density polyethylene conduit (HDPE) where buried under not less than 600 mm (2 ft) of cover. Where PVC conduit, RTRC conduit, or HDPE conduit is used, threaded rigid metal conduit or threaded intermediate metal conduit shall be used for the last 600 mm (2 ft) of the underground run to emergence or to the point of connection to the above-ground raceway, and an equipment grounding conductor shall be included to provide electrical continuity of the raceway system and for grounding of non—current-carrying metal parts. [511.8](https://2023.antflix.net#511.8) | https://2023.antflix.net#511.8 |
Chaptewr 5 Special Occupancies | 511.9 | Seals complying with the requirements of 501.15 and 501.15(B)(2) shall be provided and shall apply to horizontal as well as vertical boundaries of the defined Class I locations. [511.9](https://2023.antflix.net#511.9) | https://2023.antflix.net#511.9 |
Chaptewr 5 Special Occupancies | 511.10(A) | Battery chargers and their control equipment, and batteries being charged, shall not be located within locations classified in 511.3. [511.10(A)](https://2023.antflix.net#511.10(A)) | https://2023.antflix.net#511.10(A) |
Chaptewr 5 Special Occupancies | 511.10(B)(1) | All electrical equipment and wiring shall be installed in accordance with Part III of Article 625, except as required by 511.10(B)(2) and (B)(3). Flexible cords shall be of a type identified for extra-hard usage. [511.10(B)(1)](https://2023.antflix.net#511.10(B)(1)) | https://2023.antflix.net#511.10(B)(1) |
Chaptewr 5 Special Occupancies | 511.10(B)(2) | No connector shall be located within a Class I location as defined in 511.3. [511.10(B)(2)](https://2023.antflix.net#511.10(B)(2)) | https://2023.antflix.net#511.10(B)(2) |
Chaptewr 5 Special Occupancies | 511.10(B)(3) | Where the cord is suspended from overhead, it shall be arranged so that the lowest point of sag is at least 150 mm (6 in.) above the floor. Where an automatic arrangement is provided to pull both cord and plug beyond the range of physical damage, no additional connector shall be required in the cable or at the outlet. [511.10(B)(3)](https://2023.antflix.net#511.10(B)(3)) | https://2023.antflix.net#511.10(B)(3) |
Chaptewr 5 Special Occupancies | 511.12 | Ground-fault circuit-interrupter protection for personnel shall be provided as required in 210.8(B). [511.12](https://2023.antflix.net#511.12) | https://2023.antflix.net#511.12 |
Chaptewr 5 Special Occupancies | 511.16(A) | All metal raceways, the metal armor or metallic sheath on cables, and all non—current-carrying metal parts of fixed or portable electrical equipment, regardless of voltage, shall be grounded. [511.16(A)](https://2023.antflix.net#511.16(A)) | https://2023.antflix.net#511.16(A) |
Chaptewr 5 Special Occupancies | 511.16(B) | Grounding in Class I locations shall comply with 501.30. [511.16(B)](https://2023.antflix.net#511.16(B)) | https://2023.antflix.net#511.16(B) |
Chaptewr 5 Special Occupancies | 511.16(B)(1) | Where a circuit supplies portables or pendants and includes a grounded conductor in accordance with 200.3, receptacles, attachment plugs, connectors, and similar devices shall be of the grounding type and the grounded conductor of the flexible cord shall be connected to the screw shell of any lamp-holder or to the grounded terminal of any utilization equipment supplied. [511.16(B)(1)](https://2023.antflix.net#511.16(B)(1)) | https://2023.antflix.net#511.16(B)(1) |
Chaptewr 5 Special Occupancies | 511.16(B)(2) | Approved means shall be provided for maintaining continuity of the equipment grounding conductor between the fixed wiring system and the non—current-carrying metal portions of pendant luminaires, portable luminaires, and portable utilization equipment. [511.16(B)(2)](https://2023.antflix.net#511.16(B)(2)) | https://2023.antflix.net#511.16(B)(2) |
Chaptewr 5 Special Occupancies | 512.1 | This article covers cannabis oil preparatory equipment, extraction equipment, booths, postprocessing equipment, and systems using flammable materials (flammable gas, flammable liquid—produced vapor, combustible liquid-produced vapor) in commercial and industrial facilities. Informational Note No. 1: See ANSI/UL 1389, Plant Oil Extraction Equipment for Installation and Use in Ordinary (Unclassified) Locations and Hazardous (Classified) Locations, for information on cannabis oil equipment and systems for hazardous (classified) locations. Informational Note No. 2: See NFPA 1, Fire Code, NFPA 55, Compressed Gases and Cryogenic Fluids Code, NFPA 58, Liquefied Petroleum Gas Code, and ICC IFC, International Fire Code, together with the manufacturer's installation instructions, for information on the installation of cannabis oil equipment and systems. [512.1](https://2023.antflix.net#512.1) | https://2023.antflix.net#512.1 |
Chaptewr 5 Special Occupancies | 512.2 | In addition to the requirements of this article, cannabis oil equipment and cannabis oil systems using flammable materials shall comply with Table 512.2, as applicable, except as modified by this article. Table 512.2 Other Articles Requirement Division Classified Locations Zone Classified Locations Area classification 500.5, 500.6 505.5, 505.6, 505.7 Equipment Part III of 501, 500.7, 500.8, 501.5 505.8, 505.9, 505.20, 505.22 Wiring Part II of 501 505.15, 505.16, 505.17, 505.18, 505.19, 505.26, 505.30 [512.2](https://2023.antflix.net#512.2) | https://2023.antflix.net#512.2 |
Chaptewr 5 Special Occupancies | 512.3 | Cannabis oil equipment and systems that can release flammable materials during operation shall be classified in accordance with 512.3(A) and (B). Informational Note No. 1: Some cannabis oil applications can result in the release of heavier-than-air flammable gases or vapors into the surrounding atmosphere as a normal part of the overall extraction process (e.g., during disconnecting or opening of vessels containing flammable solvents, or during off-gassing of spent material or extracted plant oil). Cannabis oil equipment and systems can also include the connection of external containers, or other external sources, of flammable solvent. Informational Note No. 2: See NFPA 30, Flammable and Combustible Liquids Code, NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials; and NFPA 497, Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, for information on area classification. Informational Note No. 3: See NFPA 36, Standard for Solvent Extraction Plants, for information on area classification in commercial-scale extraction processes. [512.3](https://2023.antflix.net#512.3) | https://2023.antflix.net#512.3 |
Chaptewr 5 Special Occupancies | 512.3(A)(1) | For sources of gases or vapors from a flammable material, the location shall be classified in accordance with the following and as shown in Figure 512.3(A)(1): The space within 915 mm (3 ft) in all directions from any such equipment or container and extending to the floor or grade level shall be classified as Class I, Division 1 or Zone 1, whichever is applicable.The space extending 610 mm (2 ft) beyond the Class I, Division 1 or Zone 1 location shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.The space extending 1525 mm (5 ft) horizontally beyond the space described in 512.3(A)(1)(2) up to a height of 460 mm (18 in.) above the floor or grade level shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.The space inside of a tank or container and the inside of equipment that contains a flammable material shall be classified as Class I, Division 1 or Zone 0, whichever is applicable.Sumps, pits, or belowgrade channels within 3.05 m (10 ft) horizontally of a vapor source shall be classified as Class I, Division 1 or Zone 1. If the sump, pit, or channel extends beyond 3.05 m (10 ft) horizontally from the vapor source, it shall be provided with a vapor stop or classified as Class I, Division 1 or Zone 1 for its entire length. [512.3(A)(1)](https://2023.antflix.net#512.3(A)(1)) | https://2023.antflix.net#512.3(A)(1) |
Chaptewr 5 Special Occupancies | 512.3(A)(2) | Where listed equipment is marked to indicate that the level of release during disconnection or opening is maintained below 25 percent LFL without ventilation, flammable solvents shall not be released during the extraction process except during disconnecting or opening of vessels containing flammable solvents, or during off-gassing of spent material or extracted plant oil. For sources of gas or vapor from a flammable material, the location shall be classified in accordance with the following and as shown in Figure 512.3(A)(2):The space within 915 mm (3 ft) in all directions from any such equipment or container and extending to the floor or grade level shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.The space extending beyond the Division 2 or Zone 2 area shall be unclassified.The space inside of a tank or container and the inside of equipment that contains a flammable material shall be classified as Class I, Division 1 or Zone 0, whichever is applicable.The space extending 2134 mm (7 ft) horizontally beyond the space described in 512.3(A)(2)(1) up to a height of 460 mm (18 in.) above the floor or grade level shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.Sumps, pits, or belowgrade channels within 3.05 m (10 ft) horizontally of a vapor source shall be classified as Class I, Division 1 or Zone 1. If the sump, pit, or channel extends beyond 3.05 m (10 ft) horizontally from the vapor source, it shall be provided with a vapor stop or it shall be classified as Class I, Division 1 or Zone 1 for its entire length. [512.3(A)(2)](https://2023.antflix.net#512.3(A)(2)) | https://2023.antflix.net#512.3(A)(2) |
Chaptewr 5 Special Occupancies | 512.3(B) | Air exhausted from the booths shall not be recirculated or exhausted from the booths into the room in which the booths are installed. Ventilation other than exhaust ventilation can be provided to the booth, but cannot be recirculated or exhausted from the booth into the room in which the booth is installed. [512.3(B)](https://2023.antflix.net#512.3(B)) | https://2023.antflix.net#512.3(B) |
Chaptewr 5 Special Occupancies | 512.3(B)(1) | For sources of gas or vapor from a flammable material, the location shall be classified in accordance with the following and as shown in Figure 512.3(B)(1): The space within the booth shall be classified as Class I, Division 1 or Zone 1, whichever is applicable.The space within 915 mm (3 ft) of any opening shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.The interior of fresh air supply ducts and fresh air supply plenums shall be unclassified. [512.3(B)(1)](https://2023.antflix.net#512.3(B)(1)) | https://2023.antflix.net#512.3(B)(1) |
Chaptewr 5 Special Occupancies | 512.3(B)(2) | Where listed equipment is marked to indicate that the level of release during disconnection or opening is maintained below 25 percent LFL without ventilation, flammable solvents shall not be released during the extraction process except during disconnecting or opening of vessels containing flammable solvents, or during off-gassing of spent material or extracted plant oil. For sources of gas or vapor from a flammable material, the location shall be classified in accordance with the following and as shown in Figure 512.3(B)(2):The space within the booth shall be classified as Class I, Division 2 or Zone 2, whichever is applicable.The space outside any opening shall be unclassified.The interior of fresh air supply ducts and fresh air supply plenums shall be unclassified.FIGURE 512.3(A)(1) Area Classification for Equipment and Systems Other than Booths, Where Flammable Gases or Vapors Are Released.FIGURE 512.3(A)(2) Area Classification for Equipment and Systems Other than Booths, Where Flammable Gases or Vapors Are Not Released Except During Disconnection or Opening.FIGURE 512.3(B)(1) Area Classification for Booths Where Flammable Gases or Vapors Are Released.FIGURE 512.3(B)(2) Area Classification for Booths Where Flammable Gases or Vapors Are Not Released Except During Disconnection or Opening. [512.3(B)(2)](https://2023.antflix.net#512.3(B)(2)) | https://2023.antflix.net#512.3(B)(2) |
Chaptewr 5 Special Occupancies | 512.10 | All wiring installed or operated within any of the hazardous (classified) locations defined in 512.3 shall comply with the requirements of Part II of Article 501 or 505.15, as applicable, for the division or zone location in which it is installed. [512.10](https://2023.antflix.net#512.10) | https://2023.antflix.net#512.10 |
Chaptewr 5 Special Occupancies | 512.13 | Other than above cannabis oil booths, all fixed wiring installed at an elevation above hazardous (classified) locations [see Figure 512.3(A)(1) and Figure 512.3(A)(2)] shall be in metal raceways, PVC conduit, RTRC conduit, or ENT conduit. Where used, cables shall be Type MI, Type TC, or Type MC. [512.13](https://2023.antflix.net#512.13) | https://2023.antflix.net#512.13 |
Chaptewr 5 Special Occupancies | 512.20 | Installation of cannabis oil equipment and systems shall be in a distinct room or area located at commercial or industrial facilities. Where all electrical equipment within cannabis oil booths is listed for Class I, Division 1 or Zone 1 locations, gas detection shall not be required to be provided within the booth. Where gas detection in accordance with 500.7(K) is provided within booths listed for Class I, Division 2 or Zone 2 locations, electrical equipment shall be permitted. [512.20](https://2023.antflix.net#512.20) | https://2023.antflix.net#512.20 |
Chaptewr 5 Special Occupancies | 512.20(A) | Equipment that is used to prepare the plant material for subsequent extraction of the plant oil (e.g., trimming, deseeding, drying/curing) shall be listed for the location. [512.20(A)](https://2023.antflix.net#512.20(A)) | https://2023.antflix.net#512.20(A) |
Chaptewr 5 Special Occupancies | 512.20(B) | Equipment that uses flammable materials (solvents) in the process of extracting the plant oil from the plant material shall be listed for the location. Informational Note: Extraction equipment can use flammable materials as solvents to extract the plant oil from the plant material by saturating the plant material in a vented container, sealed container, or pressure vessel. Typical flammable materials used in the extraction process include butane, ethanol, hexane, pentane, propane, and LPG. [512.20(B)](https://2023.antflix.net#512.20(B)) | https://2023.antflix.net#512.20(B) |
Chaptewr 5 Special Occupancies | 512.20(C) | Enclosed areas used to house cannabis oil equipment and systems shall be listed for the location. Informational Note: Cannabis oil booths can be designed to house a single piece or multiple pieces of cannabis oil equipment. Booths range in size and can be large enough to permit entrance of personnel to perform the processing tasks. [512.20(C)](https://2023.antflix.net#512.20(C)) | https://2023.antflix.net#512.20(C) |
Chaptewr 5 Special Occupancies | 512.20(D) | Equipment that is used in the final processing stages of the extracted plant oil (e.g., vacuum ovens, rotary evaporators, solvent recovery pumps) shall be listed for the location. [512.20(D)](https://2023.antflix.net#512.20(D)) | https://2023.antflix.net#512.20(D) |
Chaptewr 5 Special Occupancies | 512.20(E) | Any combination of cannabis oil equipment needed for the overall extraction process (e.g., cannabis oil preparatory equipment, cannabis oil extraction equipment, cannabis oil booths, cannabis oil post-processing equipment) shall be listed for the location. Informational Note: See NFPA 70B, Recommended Practice for Electrical Equipment Maintenance, for information related to general electrical equipment maintenance and developing an effective electrical preventive maintenance (EPM) program. [512.20(E)](https://2023.antflix.net#512.20(E)) | https://2023.antflix.net#512.20(E) |
Chaptewr 5 Special Occupancies | 512.22 | All equipment installed or operated within any of the classified locations defined in 512.3 shall comply with the requirements of Part III of Article 501 or 505.9, as applicable, for the division or zone area in which they are used. [512.22](https://2023.antflix.net#512.22) | https://2023.antflix.net#512.22 |
Chaptewr 5 Special Occupancies | 512.30 | Equipment that could produce arcs, sparks, or hot metal particles, such as lamps and lampholders for fixed lighting, cutouts, switches, receptacles, motors, or other equipment having make-and-break or sliding contacts, where installed above a classified location other than cannabis oil booths, shall be of the totally enclosed type or be constructed to prevent the escape of sparks or hot metal particles. [512.30](https://2023.antflix.net#512.30) | https://2023.antflix.net#512.30 |
Chaptewr 5 Special Occupancies | 512.32 | Cannabis oil preparatory equipment, extraction equipment, booths, and post-processing equipment shall be listed and marked to show the hazardous (classified) location for which it is permitted to be installed. [512.32](https://2023.antflix.net#512.32) | https://2023.antflix.net#512.32 |
Chaptewr 5 Special Occupancies | 512.32(A) | Equipment for Class I, Division 1 or Class I, Division 2 shall be marked in accordance with 500.8(C). [512.32(A)](https://2023.antflix.net#512.32(A)) | https://2023.antflix.net#512.32(A) |
Chaptewr 5 Special Occupancies | 512.32(B) | Equipment for Zone 1 or Zone 2 shall be marked in accordance with 500.8(C)(2). [512.32(B)](https://2023.antflix.net#512.32(B)) | https://2023.antflix.net#512.32(B) |
Chaptewr 5 Special Occupancies | 513.1 | This article shall apply to buildings or structures in any part of which aircraft containing Class I (flammable) liquids or Class II (combustible) liquids whose temperatures are above their flash points are housed or stored and in which aircraft might undergo service, repairs, or alterations. It shall not apply to locations used exclusively for aircraft that have never contained fuel or unfueled aircraft. Informational Note No. 1: See NFPA 409, Standard on Aircraft Hangars, for definitions of aircraft hangar and unfueled aircraft. Informational Note No. 2: See NFPA 30, Flammable and Combustible Liquids Code, for information on fuel classification. [513.1](https://2023.antflix.net#513.1) | https://2023.antflix.net#513.1 |
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