Chapter stringclasses 6 values | Reference stringlengths 1 17 | Body stringlengths 62 23.1k | URL stringlengths 26 42 |
|---|---|---|---|
Chaptewr 5 Special Occupancies | 501.105(B)(2) | Switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns shall have enclosures identified for Class I, Division 1 locations in accordance with 501.105(A). Exception: General-purpose enclosures shall be permitted if current-interrupting contacts comply with one of the following: (1) Are immersed in oil (2) Are enclosed within a chamber that is hermetically sealed against the entrance of gases or vapors (3) Are in nonincendive circuits (4) Are listed for Division 2 locations [501.105(B)(2)](https://2023.antflix.net#501.105(B)(2)) | https://2023.antflix.net#501.105(B)(2) |
Chaptewr 5 Special Occupancies | 501.105(B)(3) | Resistors, resistance devices, thermionic tubes, rectifiers, and similar equipment that are used in or in connection with meters, instruments, and relays shall comply with 501.105(A). Exception: General-purpose-type enclosures shall be permitted if such equipment is without make-and-break or sliding contacts [other than as provided in 501.105(B)(2)] and if the marked maximum operating temperature of any exposed surface will not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved or has been tested and found incapable of igniting the gas or vapor. This exception shall not apply to thermionic tubes. [501.105(B)(3)](https://2023.antflix.net#501.105(B)(3)) | https://2023.antflix.net#501.105(B)(3) |
Chaptewr 5 Special Occupancies | 501.105(B)(4) | Transformer windings, impedance coils, solenoids, and other windings that do not incorporate sliding or make-or-break contacts shall be provided with enclosures. General-purpose-type enclosures shall be permitted. [501.105(B)(4)](https://2023.antflix.net#501.105(B)(4)) | https://2023.antflix.net#501.105(B)(4) |
Chaptewr 5 Special Occupancies | 501.105(B)(5) | Where general-purpose enclosures are permitted in 501.105(B)(2) through (B)(4), fuses for overcurrent protection of instrument circuits not subject to overloading in normal use shall be permitted to be mounted in general-purpose enclosures if each such fuse is preceded by a switch complying with 501.105(B)(2). [501.105(B)(5)](https://2023.antflix.net#501.105(B)(5)) | https://2023.antflix.net#501.105(B)(5) |
Chaptewr 5 Special Occupancies | 501.105(B)(6) | To facilitate replacements, process control instruments shall be permitted to be connected through flexible cord and attachment plug and receptacle if all of the following conditions apply: The attachment plug and receptacle are listed for use in Class I, Division 2 locations and listed for use with flexible cords.Exception No. 1 to (1): A Class I, Division 2 listing shall not be required if the circuit involves only nonincendive field wiring.Exception No. 2 to (1): In restricted industrial establishments, the Class I, Division 2 listing shall not be required if the requirements of 501.105(B)(6)(2), (B)(6)(3), and (B)(6)(4) are satisfied and the receptacle carries a label warning against plugging or unplugging when energized.The flexible cord does not exceed 900 mm (3 ft), is of a type listed for extra-hard usage, or is listed for hard usage and protected by location.Only necessary receptacles are provided.Unless the attachment plug and receptacle are interlocked mechanically or electrically, or otherwise designed so that they cannot be separated when the contacts are energized and the contacts cannot be energized when the plug and socket outlet are separated, a switch complying with 501.105(B)(2) is provided so that the attachment plug or receptacle is not necessary to interrupt current.Exception to (4): The switch shall not be required if the circuit is nonincendive field wiring. [501.105(B)(6)](https://2023.antflix.net#501.105(B)(6)) | https://2023.antflix.net#501.105(B)(6) |
Chaptewr 5 Special Occupancies | 501.115(A) | In Class I, Division 1 locations, switches, circuit breakers, motor controllers, and fuses, including pushbuttons, relays, and similar devices, shall be provided with enclosures, and the enclosure in each case, together with the enclosed apparatus, shall be identified as a complete assembly for use in Class I locations. [501.115(A)](https://2023.antflix.net#501.115(A)) | https://2023.antflix.net#501.115(A) |
Chaptewr 5 Special Occupancies | 501.115(B) | Switches, circuit breakers, motor controllers, and fuses in Class I, Division 2 locations shall comply with 501.115(B)(1) through (B)(4). [501.115(B)](https://2023.antflix.net#501.115(B)) | https://2023.antflix.net#501.115(B) |
Chaptewr 5 Special Occupancies | 501.115(B)(1) | Circuit breakers, motor controllers, and switches intended to interrupt current in the normal performance of the function for which they are installed shall be provided with enclosures identified for Class I, Division 1 locations in accordance with 501.105(A), unless general-purpose enclosures are provided and any of the following apply: The interruption of current occurs within a chamber hermetically sealed against the entrance of gases and vapors.The current make-and-break contacts are oil-immersed and of the general-purpose type having a 50-mm (2-in.) minimum immersion for power contacts and a 25-mm (1-in.) minimum immersion for control contacts.The interruption of current occurs within an enclosure, identified for the location, and marked "Leads Factory Sealed", or "Factory Sealed", or "Seal not Required", or equivalent.The device is a solid state, switching control without contacts, where the surface temperature does not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved. [501.115(B)(1)](https://2023.antflix.net#501.115(B)(1)) | https://2023.antflix.net#501.115(B)(1) |
Chaptewr 5 Special Occupancies | 501.115(B)(2) | Fused or unfused disconnect and isolating switches for transformers or capacitor banks that are not intended to interrupt current in the normal performance of the function for which they are installed shall be permitted to be installed in general-purpose enclosures. [501.115(B)(2)](https://2023.antflix.net#501.115(B)(2)) | https://2023.antflix.net#501.115(B)(2) |
Chaptewr 5 Special Occupancies | 501.115(B)(3) | For the protection of motors, appliances, and lamps, other than as provided in 501.115(B)(4), standard plug or cartridge fuses shall be permitted, provided they are placed within enclosures identified for the location; or fuses shall be permitted if they are within general-purpose enclosures, and if they are of a type in which the operating element is immersed in oil or other approved liquid, or the operating element is enclosed within a chamber hermetically sealed against the entrance of gases and vapors, or the fuse is a nonindicating, filled, current-limiting type. [501.115(B)(3)](https://2023.antflix.net#501.115(B)(3)) | https://2023.antflix.net#501.115(B)(3) |
Chaptewr 5 Special Occupancies | 501.115(B)(4) | Listed cartridge fuses shall be permitted as supplementary protection within luminaires. [501.115(B)(4)](https://2023.antflix.net#501.115(B)(4)) | https://2023.antflix.net#501.115(B)(4) |
Chaptewr 5 Special Occupancies | 501.120 | Transformers, impedance coils, and resistors used as, or in conjunction with, control equipment for motors, generators, and appliances shall comply with 501.120(A) and (B). [501.120](https://2023.antflix.net#501.120) | https://2023.antflix.net#501.120 |
Chaptewr 5 Special Occupancies | 501.120(A) | In Class I, Division 1 locations, transformers, impedance coils, and resistors, together with any switching mechanism associated with them, shall be provided with enclosures identified for Class I, Division 1 locations in accordance with 501.105(A). [501.120(A)](https://2023.antflix.net#501.120(A)) | https://2023.antflix.net#501.120(A) |
Chaptewr 5 Special Occupancies | 501.120(B) | In Class I, Division 2 locations, control transformers and resistors shall comply with 501.120(B)(1) through (B)(3). [501.120(B)](https://2023.antflix.net#501.120(B)) | https://2023.antflix.net#501.120(B) |
Chaptewr 5 Special Occupancies | 501.120(B)(1) | Switching mechanisms used in conjunction with transformers, impedance coils, and resistors shall comply with 501.115(B). [501.120(B)(1)](https://2023.antflix.net#501.120(B)(1)) | https://2023.antflix.net#501.120(B)(1) |
Chaptewr 5 Special Occupancies | 501.120(B)(2) | Enclosures for windings of transformers, solenoids, or impedance coils shall be permitted to be of the general-purpose type. [501.120(B)(2)](https://2023.antflix.net#501.120(B)(2)) | https://2023.antflix.net#501.120(B)(2) |
Chaptewr 5 Special Occupancies | 501.120(B)(3) | Resistors shall be provided with enclosures; and the assembly shall be identified for Class I locations, unless resistance is nonvariable and maximum operating temperature, in degrees Celsius, will not exceed 80 percent of the autoignition temperature of the gas or vapor involved or the resistor has been tested and found incapable of igniting the gas or vapor. [501.120(B)(3)](https://2023.antflix.net#501.120(B)(3)) | https://2023.antflix.net#501.120(B)(3) |
Chaptewr 5 Special Occupancies | 501.125(A) | In Class I, Division 1 locations, motors, generators, and other rotating electrical machinery shall be one of the following: Identified for Class I, Division 1 locationsOf the totally enclosed type supplied with positive-pressure ventilation from a source of clean air with discharge to a safe area, so arranged to prevent energizing of the machine until ventilation has been established and the enclosure has been purged with at least 10 volumes of air, and so arranged to automatically deenergize the equipment when the air supply failsOf the totally enclosed inert gas—filled type supplied with a suitable reliable source of inert gas for pressurizing the enclosure, with devices provided to ensure a positive pressure in the enclosure and arranged to automatically de-energize the equipment when the gas supply failsFor machines that are for use only in restricted industrial establishments, the machine is permitted to be of a type designed to be submerged in a liquid that is flammable only when vaporized and mixed with air. or in a gas or vapor at a pressure greater than atmospheric and that is flammable only when mixed with air; and the machine is so arranged to prevent energizing it until it has been purged with the liquid or gas to exclude air, and so arranged to automatically de-energize the equipment when the supply of liquid or gas or vapor fails or the pressure is reduced to atmosphericTotally enclosed motors of the types specified in 501.125(A)(2) or (A)(3) shall have no external surface with an operating temperature in degrees Celsius in excess of 80 percent of the autoignition temperature of the gas or vapor involved. Appropriate devices shall be provided to detect and automatically de-energize the motor or provide an adequate alarm if there is any increase in temperature of the motor beyond designed limits. Auxiliary equipment shall be of a type identified for the location in which it is installed. [501.125(A)](https://2023.antflix.net#501.125(A)) | https://2023.antflix.net#501.125(A) |
Chaptewr 5 Special Occupancies | 501.125(B) | In Class I, Division 2 locations, motors, generators, and other rotating electrical machinery shall comply with (1), (2), or (3). They shall also comply with (4) and (5), if applicable. Be identified for Class I, Division 2 locations, orBe identified for Class I, Division 1 locations where sliding contacts, centrifugal or other types of switching mechanism (including motor overcurrent, overloading, and overtemperature devices), or integral resistance devices, either while starting or while running, are employed, orBe open or nonexplosionproof enclosed motors, such as squirrel-cage induction motors without brushes, switching mechanisms, or similar arc-producing devices that are not identified for use in a Class I, Division 2 location.The exposed surface of space heaters used to prevent condensation of moisture during shutdown periods shall not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved when operated at rated voltage, and the maximum space heater surface temperature [based on a 40°C or higher marked ambient] shall be permanently marked on a visible name-plate mounted on the motor. Otherwise, space heaters shall be identified for Class I, Division 2 locations.A sliding contact shaft bonding device used for the purpose of maintaining the rotor at ground potential, shall be permitted where the potential discharge energy is determined to be nonincendive for the application. The shaft bonding device shall be permitted to be installed on the inside or the outside of the motor.Informational Note No. 1: It is important to consider the temperature of internal and external surfaces that might be exposed to the flammable atmosphere.Informational Note No. 2: It is important to consider the risk of ignition due to currents arcing across discontinuities and overheating of parts in multisection enclosures of large motors and generators. Such motors and generators might need equipotential bonding jumpers across joints in the enclosure and from enclosure to ground. Where the presence of ignitible gases or vapors is suspected, clean-air purging might be needed immediately prior to and during start-up periods.Informational Note No. 3: See IEEE 1349, IEEE Guide for the Application of Electric Machines in Zone 2 and Class I, Division 2 Hazardous (Classified) Locations, for information on the application of rotating electric machines including shaft bonding devices and potential discharge energy calculations.Informational Note No. 4: See ANSI/UL 122001, General Requirements for Electrical Ignition Systems for Internal Combustion Engines in Class I, Division 2 or Zone 2, Hazardous (Classified) Locations, for reciprocating engine—driven generators, compressors, and other equipment installed in Class I, Division 2 locations. Reciprocating engine—driven generators, compressors, and other equipment installed in Class I, Division 2 locations might present a risk of ignition of flammable materials associated with fuel, starting, and compression due to inadvertent release or equipment malfunction by the engine ignition system and controls.Informational Note No. 5: See UL 1836, Outline of Investigation for Electric Motors and Generators for Use in Class I, Division 2, Class I, Zone 2, Class II, Division 2 and Zone 22 Hazardous (Classified) Locations, for details of the evaluation process to determine incendivity. Refer to Annex A and Figure A1. [501.125(B)](https://2023.antflix.net#501.125(B)) | https://2023.antflix.net#501.125(B) |
Chaptewr 5 Special Occupancies | 501.130 | Luminaires shall comply with 501.130(A) or (B). [501.130](https://2023.antflix.net#501.130) | https://2023.antflix.net#501.130 |
Chaptewr 5 Special Occupancies | 501.130(A) | In Class I, Division 1 locations, luminaires shall comply with 501.130(A)(1) through (A)(4). [501.130(A)](https://2023.antflix.net#501.130(A)) | https://2023.antflix.net#501.130(A) |
Chaptewr 5 Special Occupancies | 501.130(A)(1) | Each luminaire shall be identified as a complete assembly for the Class I, Division 1 location and shall be clearly marked to indicate the maximum wattage of lamps for which it is identified. Luminaires intended for portable use shall be specifically listed as a complete assembly for that use. [501.130(A)(1)](https://2023.antflix.net#501.130(A)(1)) | https://2023.antflix.net#501.130(A)(1) |
Chaptewr 5 Special Occupancies | 501.130(A)(2) | Each luminaire shall be protected against physical damage by a suitable guard or by location. [501.130(A)(2)](https://2023.antflix.net#501.130(A)(2)) | https://2023.antflix.net#501.130(A)(2) |
Chaptewr 5 Special Occupancies | 501.130(A)(3) | Pendant luminaires shall be suspended by and supplied through threaded rigid metal conduit stems or threaded steel intermediate conduit stems, and threaded joints shall be provided with set-screws or other effective means to prevent loosening. For stems longer than 300 mm (12 in.), permanent and effective bracing against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of a fitting or flexible connector identified for the Class I, Division 1 location shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. [501.130(A)(3)](https://2023.antflix.net#501.130(A)(3)) | https://2023.antflix.net#501.130(A)(3) |
Chaptewr 5 Special Occupancies | 501.130(A)(4) | Boxes, box assemblies, or fittings used for the support of luminaires shall be identified for Class I locations. [501.130(A)(4)](https://2023.antflix.net#501.130(A)(4)) | https://2023.antflix.net#501.130(A)(4) |
Chaptewr 5 Special Occupancies | 501.130(B) | In Class I, Division 2 locations, luminaires shall comply with 501.130(B)(1) through (B)(6). [501.130(B)](https://2023.antflix.net#501.130(B)) | https://2023.antflix.net#501.130(B) |
Chaptewr 5 Special Occupancies | 501.130(B)(1) | Where lamps are of a size or type that may, under normal operating conditions, reach surface temperatures exceeding 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved, luminaires shall comply with 501.130(A)(1) or shall be of a type that has been tested in order to determine the marked operating temperature or temperature class (T code). [501.130(B)(1)](https://2023.antflix.net#501.130(B)(1)) | https://2023.antflix.net#501.130(B)(1) |
Chaptewr 5 Special Occupancies | 501.130(B)(2) | Luminaires shall be protected from physical damage by suitable guards or by location. Where there is danger that falling sparks or hot metal from lamps or luminaires might ignite localized concentrations of flammable vapors or gases, suitable enclosures or other effective protective means shall be provided. [501.130(B)(2)](https://2023.antflix.net#501.130(B)(2)) | https://2023.antflix.net#501.130(B)(2) |
Chaptewr 5 Special Occupancies | 501.130(B)(3) | Pendant luminaires shall be suspended by threaded rigid metal conduit stems, threaded steel intermediate metal conduit stems, or other approved means. For rigid stems longer than 300 mm (12 in.), permanent and effective bracing against lateral displacement shall be provided at a level not more than 300 mm (12 in.) above the lower end of the stem, or flexibility in the form of an identified fitting or flexible connector shall be provided not more than 300 mm (12 in.) from the point of attachment to the supporting box or fitting. [501.130(B)(3)](https://2023.antflix.net#501.130(B)(3)) | https://2023.antflix.net#501.130(B)(3) |
Chaptewr 5 Special Occupancies | 501.130(B)(4) | Portable lighting equipment shall comply with 501.130(B)(4)(a) or (B)(4)(b). Portable lighting equipment shall comply with 501.130(B)(1).Portable lighting equipment mounted on movable stands and connected by flexible cords in accordance with 501.140 shall be permitted to comply with 501.130(B)(1), where mounted in any position, if it is protected from physical damage in accordance with 501.130(B)(2). [501.130(B)(4)](https://2023.antflix.net#501.130(B)(4)) | https://2023.antflix.net#501.130(B)(4) |
Chaptewr 5 Special Occupancies | 501.130(B)(5) | Switches that are a part of a luminaire or of an individual lampholder shall comply with 501.115(B)(1). [501.130(B)(5)](https://2023.antflix.net#501.130(B)(5)) | https://2023.antflix.net#501.130(B)(5) |
Chaptewr 5 Special Occupancies | 501.130(B)(6) | Starting and control equipment for electric-discharge lamps shall comply with 501.120(B). Exception: A thermal protector potted into a thermally protected fluorescent lamp ballast if the luminaire is identified for the location. [501.130(B)(6)](https://2023.antflix.net#501.130(B)(6)) | https://2023.antflix.net#501.130(B)(6) |
Chaptewr 5 Special Occupancies | 501.135(A) | In Class I, Division 1 locations, all utilization equipment shall be identified for Class I, Division 1 locations. [501.135(A)](https://2023.antflix.net#501.135(A)) | https://2023.antflix.net#501.135(A) |
Chaptewr 5 Special Occupancies | 501.135(B) | 2. In Class I, Division 2 locations, all utilization equipment shall comply with 501.135(B)(1) through (B)(4). [501.135(B)](https://2023.antflix.net#501.135(B)) | https://2023.antflix.net#501.135(B) |
Chaptewr 5 Special Occupancies | 501.135(B)(1) | Electrically heated utilization equipment shall meet one of the following requirements: The heater shall not exceed 80 percent of the autoignition temperature in degrees Celsius of the gas or vapor involved on any surface that is exposed to the gas or vapor when continuously energized at the maximum rated ambient temperature. If a temperature controller is not provided, these conditions shall apply when the heater is operated at 120 percent of rated voltage.Exception No. 1 to (1): For motor-mounted anticondensation space heaters, see 501.125.Exception No. 2 to (1): Where a current-limiting device is applied to the circuit serving the heater to limit the current in the heater to a value less than that required to raise the heater surface temperature to 80 percent of the autoignition temperature.The heater shall be identified for Class I, Division 1 locations.Exception to (2): Electrical resistance and skin effect heat tracing identified for Class I, Division 2 locations shall be permitted.Informational Note No. 1: See ANSI/UL 60079-30-1, Explosive Atmospheres - Part 30-1: Electrical Resistance Trace Heating - General and Testing Requirements, for information on electric resistance heat tracing.Informational Note No. 2: See IEEE 844.1/CSA C22.2 No. 293.1, IEEE/CSA Standard for Skin Effect Trace Heating of Pipelines, Vessels, Equipment, and Structures - General, Testing, Marking, and Documentation Requirements, for information on electric skin effect heat tracing.Informational Note No. 3: See IEEE 844.3/CSA C22.2 No. 293.3, IEEE/CSA Standard for Impedance Heating of Pipelines and Equipment - General, Testing, Marking, and Documentation Requirements, for information on electric impedance heating. [501.135(B)(1)](https://2023.antflix.net#501.135(B)(1)) | https://2023.antflix.net#501.135(B)(1) |
Chaptewr 5 Special Occupancies | 501.135(B)(2) | Motors of motor-driven utilization equipment shall comply with 501.125(B). [501.135(B)(2)](https://2023.antflix.net#501.135(B)(2)) | https://2023.antflix.net#501.135(B)(2) |
Chaptewr 5 Special Occupancies | 501.135(B)(3) | Switches, circuit breakers, and fuses shall comply with 501.115(B). [501.135(B)(3)](https://2023.antflix.net#501.135(B)(3)) | https://2023.antflix.net#501.135(B)(3) |
Chaptewr 5 Special Occupancies | 501.135(B)(4) | Luminaires shall comply with 501.130(B). [501.135(B)(4)](https://2023.antflix.net#501.135(B)(4)) | https://2023.antflix.net#501.135(B)(4) |
Chaptewr 5 Special Occupancies | 501.140(A) | Flexible cord shall be permitted as follows: For connection between portable lighting equipment or other portable utilization equipment and the fixed portion of their supply circuit. The flexible cord shall be attached to the utilization equipment with a cord connector listed for the protection technique of the equipment wiring compartment. An attachment plug in accordance with 501.140(B)(4) shall be employed.For that portion of the circuit where the fixed wiring methods of 501.10(A) cannot provide the necessary degree of movement for fixed and mobile electrical utilization equipment, and the flexible cord is protected by location or by a suitable guard from damage and only in a restricted industrial establishment.For electric submersible pumps with means for removal without entering the wet-pit. The extension of the flexible cord within a suitable raceway between the wet-pit and the power source shall be permitted.For electric mixers intended for travel into and out of open-type mixing tanks or vats.For temporary portable assemblies consisting of receptacles, switches, and other devices that are not considered portable utilization equipment but are individually listed for the location. [501.140(A)](https://2023.antflix.net#501.140(A)) | https://2023.antflix.net#501.140(A) |
Chaptewr 5 Special Occupancies | 501.140(B) | Where flexible cords are used, the cords 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 supported by clamps or by other suitable means in such a manner that there is no tension on the terminal connectionsIn Division 1 locations or in Division 2 locations where the boxes, fittings, or enclosures are required to be explosionproof, the cord shall be terminated with a cord connector or attachment plug listed for the location or a listed cord connector installed with a seal listed for the location. In Division 2 locations where explosionproof equipment is not required, the cord shall be terminated with a listed cord connector or listed attachment plug.Be of continuous length. Where 501.140(A)(5) is applied, cords shall be of continuous length from the power source to the temporary portable assembly and from the temporary portable assembly to the utilization equipment.Informational Note: See 501.20 for flexible cords exposed to liquids having a deleterious effect on the conductor insulation. [501.140(B)](https://2023.antflix.net#501.140(B)) | https://2023.antflix.net#501.140(B) |
Chaptewr 5 Special Occupancies | 501.141 | Flexible cables installed in Class I, Division 2 locations shall comply with 501.141 (A) and (B). [501.141](https://2023.antflix.net#501.141) | https://2023.antflix.net#501.141 |
Chaptewr 5 Special Occupancies | 501.141(A) | Flexible cables shall be permitted to be installed in accordance with 501.141(A)(1) and (A)(2). [501.141(A)](https://2023.antflix.net#501.141(A)) | https://2023.antflix.net#501.141(A) |
Chaptewr 5 Special Occupancies | 501.141(A)(1) | Flexible cables in other than nonincendive field wiring applications shall be permitted in accordance with the following: Flexible cables shall be permitted to connect two pieces of electrical equipment by means of a cable assembly installed in accordance with 501.141(B)(2)(a) or (B)(2)(b).Flexible cables shall be permitted to connect a piece of electrical equipment to the premises wiring by means of a cable assembly installed in accordance with 501.141(B)(2)(c). [501.141(A)(1)](https://2023.antflix.net#501.141(A)(1)) | https://2023.antflix.net#501.141(A)(1) |
Chaptewr 5 Special Occupancies | 501.141(A)(2) | Flexible cables in nonincendive field wiring applications shall be permitted to be used in accordance with 501.10(B)(3). [501.141(A)(2)](https://2023.antflix.net#501.141(A)(2)) | https://2023.antflix.net#501.141(A)(2) |
Chaptewr 5 Special Occupancies | 501.141(B) | If flexible cables are used as permitted in 501.141(A), the associated cable assemblies shall comply with 501.141(B)(1) through (B)(3). [501.141(B)](https://2023.antflix.net#501.141(B)) | https://2023.antflix.net#501.141(B) |
Chaptewr 5 Special Occupancies | 501.141(B)(1) | Listed Type P cables shall comply with 501.141(A)(1) and shall be installed as required in Part II of Article 337. The associated cable assemblies shall comply with the requirements of 501.141 (B)(2). [501.141(B)(1)](https://2023.antflix.net#501.141(B)(1)) | https://2023.antflix.net#501.141(B)(1) |
Chaptewr 5 Special Occupancies | 501.141(B)(2) | Terminations shall comply with 501.141(B)(2)(a), (B)(2)(b), or (B)(2)(c). Connecting Two Devices or Pieces of Electrical Utilization Equipment Together. The cable connectors on each end of the cable shall be listed for use in Class I, Division 2 locations and listed for the type of cable being used.Connecting Two Devices or Pieces of Electrical Utilization Equipment Together. A cable connector listed for Class I, Division 2 and listed for the type of cable being used shall be used on one end and a fitting listed for the type of protection and the type of cable being used shall be used on the other end.Connecting an Electrical Device or Utilization Equipment to Premises Wiring. The cable connectors used on both ends shall be listed for Class I, Division 2 locations and for the type of cable being used. On one end of the cable, the cable connector shall also be listed for the type of protection. [501.141(B)(2)](https://2023.antflix.net#501.141(B)(2)) | https://2023.antflix.net#501.141(B)(2) |
Chaptewr 5 Special Occupancies | 501.141(B)(3) | Flexible cable shall be installed in accordance with 501.141(B)(3)(a) through (B)(3)(c) to protect against the disconnection of the cable connectors when energized. Switch. A switch complying with the requirements of 501.105(B)(2) shall be provided to disconnect power so that cable connectors are not depended on as a disconnecting means.Cable Connectors Mechanically or Electrically Interlocked. Switches shall not be required where the cable connectors are interlocked mechanically or electrically, or are otherwise designed to ensure the cable connectors cannot be separated when energized and cannot be energized when separated.Warning Label. The fixed equipment and the cable assembly shall both carry a label warning against plugging or unplugging when energized, with both labels as close to the cable connector termination as possible. [501.141(B)(3)](https://2023.antflix.net#501.141(B)(3)) | https://2023.antflix.net#501.141(B)(3) |
Chaptewr 5 Special Occupancies | 501.145 | Receptacles and attachment plugs shall be listed for the location, except as permitted by 501.105(B)(6). [501.145](https://2023.antflix.net#501.145) | https://2023.antflix.net#501.145 |
Chaptewr 5 Special Occupancies | 501.145(A) | Receptacles shall be part of the premises wiring, except as permitted by 501.140(A). [501.145(A)](https://2023.antflix.net#501.145(A)) | https://2023.antflix.net#501.145(A) |
Chaptewr 5 Special Occupancies | 501.145(B) | Attachment plugs shall be of the type that provides connection to the equipment grounding conductor of a permitted flexible cord. [501.145(B)](https://2023.antflix.net#501.145(B)) | https://2023.antflix.net#501.145(B) |
Chaptewr 5 Special Occupancies | 501.150(A) | In Class I, Division 1 locations, all apparatus and equipment of signaling, alarm, remote-control, and communications systems, regardless of voltage, shall be identified for Class I, Division 1 locations, and all wiring shall comply with 501.10(A), 501.15(A), and 501.15(C). [501.150(A)](https://2023.antflix.net#501.150(A)) | https://2023.antflix.net#501.150(A) |
Chaptewr 5 Special Occupancies | 501.150(B) | In Class I, Division 2 locations, signaling, alarm, remote-control, and communications systems shall comply with 501.150(B)(1) through (B)(4). [501.150(B)](https://2023.antflix.net#501.150(B)) | https://2023.antflix.net#501.150(B) |
Chaptewr 5 Special Occupancies | 501.150(B)(1) | Switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns shall have enclosures identified for Class I, Division 1 locations in accordance with 501.105(A). Exception: General-purpose enclosures shall be permitted if current-interrupting contacts are one of the following: (1) Immersed in oil (2) Enclosed within a chamber hermetically sealed against the entrance of gases or vapors (3) In nonincendive circuits (4) Part of a listed nonincendive component [501.150(B)(1)](https://2023.antflix.net#501.150(B)(1)) | https://2023.antflix.net#501.150(B)(1) |
Chaptewr 5 Special Occupancies | 501.150(B)(2) | Resistors, resistance devices, thermionic tubes, rectifiers, and similar equipment shall comply with 501.105(B)(3). [501.150(B)(2)](https://2023.antflix.net#501.150(B)(2)) | https://2023.antflix.net#501.150(B)(2) |
Chaptewr 5 Special Occupancies | 501.150(B)(3) | Enclosures shall be provided for lightning protective devices and for fuses. Such enclosures shall be permitted to be of the general-purpose type. [501.150(B)(3)](https://2023.antflix.net#501.150(B)(3)) | https://2023.antflix.net#501.150(B)(3) |
Chaptewr 5 Special Occupancies | 501.150(B)(4) | All wiring shall comply with 501.10(B), 501.15(B), and 501.15(C). [501.150(B)(4)](https://2023.antflix.net#501.150(B)(4)) | https://2023.antflix.net#501.150(B)(4) |
Chaptewr 5 Special Occupancies | 502.1 | This article covers the requirements for electrical and electronic equipment and wiring for all voltages in Class II, Division 1 and 2 locations where fire or explosion hazards may exist due to combustible dust. [502.1](https://2023.antflix.net#502.1) | https://2023.antflix.net#502.1 |
Chaptewr 5 Special Occupancies | 502.5 | Explosionproof equipment and wiring shall not be required and shall not be acceptable in Class II locations unless also identified for such locations. [502.5](https://2023.antflix.net#502.5) | https://2023.antflix.net#502.5 |
Chaptewr 5 Special Occupancies | 502.6 | Equipment listed and marked in accordance with 506.9(C)(2) for Zone 20 locations shall be permitted in Class II, Division 1 locations for the same dust atmosphere; and with a suitable temperature class. Equipment listed and marked in accordance with 506.9(C)(2) for Zone 20, 21, or 22 locations shall be permitted in Class II, Division 2 locations for the same dust atmosphere and with a suitable temperature class. [502.6](https://2023.antflix.net#502.6) | https://2023.antflix.net#502.6 |
Chaptewr 5 Special Occupancies | 502.10 | Wiring methods shall comply with 502.10(A) or (B). Informational Note: See Article 100 for the definition of restricted industrial establishment [as applied to hazardous (classified) locations]. [502.10](https://2023.antflix.net#502.10) | https://2023.antflix.net#502.10 |
Chaptewr 5 Special Occupancies | 502.10(A)(1) | In Class II, Division 1 locations, the following wiring methods shall be permitted: Threaded rigid metal conduit (RMC) or threaded intermediate metal conduit (IMC), including conduit systems with supplemental corrosion protection coatings.Type MI cable with termination fittings listed for the location. Type MI cable shall be installed and supported in a manner to avoid tensile stress at the termination fittings.In restricted industrial establishments, Type MC-HL. cable, listed for use in Class II, Division 1 locations, with a gas/vaportight continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, a separate equipment grounding conductor(s) in accordance with 250.122, and provided with termination fittings listed for the location, shall be permitted.Optical fiber cable Type OFNP, Type OFCP, Type OFNR, Type OFCR, Type OFNG, Type OFCG, Type OFN, or Type OFC shall be permitted to be installed in raceways in accordance with 502.10(A). Optical fiber cables shall be sealed in accordance with 502.15.In restricted industrial establishments, listed Type ITC-HL cable with a gas/vaportight continuous corrugated metallic sheath and an overall jacket of suitable polymeric material, and terminated with fittings listed for the application, and installed in accordance with 335.4.In restricted industrial establishments, for applications limited to 600 volts nominal or less, where the cable is not subject to physical damage and is terminated with fittings listed for the location, listed Type TC-ER-HL cable. When installed in ladder, ventilated trough, or ventilated channel cable trays, cables shall be installed in a single layer, with a space not less than the larger cable diameter between the two adjacent cables unless otherwise protected against dust buildup resulting in increased heat, Type TC-ER-HL cable shall be installed in accordance with 336.10.Informational Note No. 1: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for construction, testing, and marking of cables and cable fittings.In restricted industrial establishments, listed Type P cable with metal braid armor, with an overall jacket, that is terminated with fittings listed for the location and installed in accordance with 337.10. When installed in ladder, ventilated trough, or ventilated channel cable trays, cables shall be installed in a single layer, with a space not less than the larger cable diameter between the two adjacent cables, unless otherwise protected against dust buildup resulting in increased heat.Informational Note No. 2: See ANSI/UL 1309, Marine Shipboard Cable, for information on construction, testing, and marking of Type P cable.Informational Note No. 3: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cable fittings. [502.10(A)(1)](https://2023.antflix.net#502.10(A)(1)) | https://2023.antflix.net#502.10(A)(1) |
Chaptewr 5 Special Occupancies | 502.10(A)(2) | Where flexible connections are necessary, one or more of the following shall also be permitted: Dusttight flexible connectors.Liquidtight flexible metal conduit (LFMC) with listed fittings and bonded in accordance with 502.30(B).Liquidtight flexible nonmetallic conduit (LFNC) with listed fittings.Interlocked armor Type MC cable having an overall jacket of suitable polymeric material and provided with termination fittings listed for Class II, Division 1 locations.Flexible cord listed for extra-hard usage and terminated with listed dusttight cord connectors. Where used, flexible cords shall comply with 502.140.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 dusttight fittings.In restricted industrial establishments, for applications limited to 600 volts nominal or less, and where the cable is not subject to physical damage and is terminated with fittings listed for the location, listed Type TC-ER-HL cable. Type TC-ER-HL cable shall be installed in accordance with 336.10.Informational Note No. 1: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for construction, testing, and marking of cables and cable fittings.In restricted industrial establishments, listed Type P cable with metal braid armor, with an overall jacket, terminated with fittings listed for the location, and installed in accordance with 337.10.Informational Note No. 2: See UL 1309A, Outline of Investigation for Cable for Use in Mobile Installations, for information on construction, testing, and marking of Type P cable.Informational Note No. 3: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cable fittings. [502.10(A)(2)](https://2023.antflix.net#502.10(A)(2)) | https://2023.antflix.net#502.10(A)(2) |
Chaptewr 5 Special Occupancies | 502.10(A)(3) | Boxes and fittings shall be provided with threaded bosses for connection to conduit or cable terminations and shall be dusttight. Boxes and fittings in which taps, joints, or terminal connections are made, or that are used in Group E locations, shall be identified for Class II locations. Informational Note: See ANSI/UL 2225, Cables and Cable-Fittings for Use in Hazardous (Classified) Locations, for information on construction, testing, and marking of cables, dust-ignitionproof cable fittings, and dust-ignitionproof cord connectors for entry into enclosures required to be dust-ignitionproof. [502.10(A)(3)](https://2023.antflix.net#502.10(A)(3)) | https://2023.antflix.net#502.10(A)(3) |
Chaptewr 5 Special Occupancies | 502.10(B) | Wiring methods installed in Class II, Division 2 locations shall be in accordance with 502.10(B)(1) through (B)(4). [502.10(B)](https://2023.antflix.net#502.10(B)) | https://2023.antflix.net#502.10(B) |
Chaptewr 5 Special Occupancies | 502.10(B)(1) | In Class II, Division 2 locations, the following wiring methods shall be permitted: All wiring methods permitted in 502.10(A).Rigid metal conduit (RMC) or intermediate metal conduit (IMC) with listed threaded or threadless fittings, including conduit systems with supplemental corrosion protection coatings.Dusttight wireways or electrical metallic tubing (EMT) with listed compression-type connectors or listed compression-type couplings.Type MC, 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.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.In restricted industrial establishments where wiring methods in 502.10(B)(1)(1)(2) will not provide the corrosion resistance required for the installation environment, either of the following:Listed reinforced thermosetting resin conduit (RTRC), factory elbows, and associated fittings, all marked with suffix -XWSchedule 80 PVC conduit, factory elbows, and associated fittingsOptical 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 other raceway in accordance with 502.10(B). Optical fiber cables shall be sealed in accordance with 502.15.Cablebus.In restricted industrial establishments, listed Type P cable with or without metal braid armor, with an overall jacket, that is terminated with listed fittings and installed in accordance with 337.10.Informational Note: See UL 1309A, Outline of Investigation for Cable for Use in Mobile Installations, for information on construction, testing, and marking of Type P cable. [502.10(B)(1)](https://2023.antflix.net#502.10(B)(1)) | https://2023.antflix.net#502.10(B)(1) |
Chaptewr 5 Special Occupancies | 502.10(B)(2) | If flexibility is necessary, 502.10(A)(2) shall apply. [502.10(B)(2)](https://2023.antflix.net#502.10(B)(2)) | https://2023.antflix.net#502.10(B)(2) |
Chaptewr 5 Special Occupancies | 502.10(B)(3) | Nonincendive field wiring shall be permitted using any of the wiring methods permitted for unclassified locations. Nonincendive field wiring systems shall be installed in accordance with the control drawing(s). Simple apparatus, not shown on the control drawing, shall be permitted in a nonincendive field wiring circuit if the simple apparatus does not interconnect the nonincendive field wiring circuit to any other circuit. Informational Note: See Article 100 for the definition of simple apparatus. Separate nonincendive field wiring circuits shall be installed in accordance with one of the following:In separate cablesIn multiconductor cables where the conductors of each circuit are within a grounded metal shieldIn multiconductor cables or in raceways where the conductors of each circuit have insulation with a minimum thickness of 0.25 mm (0.01 in.) [502.10(B)(3)](https://2023.antflix.net#502.10(B)(3)) | https://2023.antflix.net#502.10(B)(3) |
Chaptewr 5 Special Occupancies | 502.10(B)(4) | All boxes and fittings shall be dust-tight. [502.10(B)(4)](https://2023.antflix.net#502.10(B)(4)) | https://2023.antflix.net#502.10(B)(4) |
Chaptewr 5 Special Occupancies | 502.15 | If a raceway provides communication between an enclosure that is required to be dust-ignitionproof and one that is not, suitable means shall be provided to prevent the entrance of dust into the dust-ignitionproof enclosure through the raceway. One of the following means shall be permitted: A permanent and effective sealA horizontal raceway not less than 3.05 m (10 ft) longA vertical raceway not less than 1.5 m (5 ft) long and extending downward from the dust-ignitionproof enclosureA raceway installed in a manner equivalent to 502.15(2) or (3) that extends only horizontally and downward from the dust-ignition proof enclosuresElectrical sealing puttyIf a raceway provides communication between an enclosure that is required to be dust-ignitionproof and an enclosure in an unclassified location, seals shall not be required.Sealing fittings shall be accessible and shall not be required to be explosionproof. [502.15](https://2023.antflix.net#502.15) | https://2023.antflix.net#502.15 |
Chaptewr 5 Special Occupancies | 502.25 | There shall be no uninsulated exposed parts, such as electrical conductors, buses, terminals, or components, that operate at more than 30 volts (15 volts in wet locations). These parts shall additionally be protected by a protection technique according to 500.7(E), (F), or (G) that is suitable for the location. [502.25](https://2023.antflix.net#502.25) | https://2023.antflix.net#502.25 |
Chaptewr 5 Special Occupancies | 502.30 | Regardless of the voltage of the electrical system, wiring systems and equipment shall comply with 502.30(A) and (B). [502.30](https://2023.antflix.net#502.30) | https://2023.antflix.net#502.30 |
Chaptewr 5 Special Occupancies | 502.30(A) | Wiring systems and equipment shall be grounded in accordance with Part I and Part VI of Article 250, as applicable. [502.30(A)](https://2023.antflix.net#502.30(A)) | https://2023.antflix.net#502.30(A) |
Chaptewr 5 Special Occupancies | 502.30(B) | Bonding shall comply with Part I and Part V of Article 250, as applicable, and 502.30(B)(1) and (B)(2). [502.30(B)](https://2023.antflix.net#502.30(B)) | https://2023.antflix.net#502.30(B) |
Chaptewr 5 Special Occupancies | 502.30(B)(1) | Bonding shall comply with 502.30(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). [502.30(B)(1)](https://2023.antflix.net#502.30(B)(1)) | https://2023.antflix.net#502.30(B)(1) |
Chaptewr 5 Special Occupancies | 502.30(B)(2) | Liquidtight flexible metal conduit shall comply with 502.30(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 Class II, Division 2 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. [502.30(B)(2)](https://2023.antflix.net#502.30(B)(2)) | https://2023.antflix.net#502.30(B)(2) |
Chaptewr 5 Special Occupancies | 502.35 | Surge arresters and surge-protective devices installed in a Class II, Division 1 location shall be in suitable enclosures. Surge-protective capacitors shall be of a type designed for specific duty. [502.35](https://2023.antflix.net#502.35) | https://2023.antflix.net#502.35 |
Chaptewr 5 Special Occupancies | 502.100(A) | In Class II, Division 1 locations, transformers and capacitors shall comply with 502.100(A)(1) through (A)(3). [502.100(A)](https://2023.antflix.net#502.100(A)) | https://2023.antflix.net#502.100(A) |
Chaptewr 5 Special Occupancies | 502.100(A)(1) | Transformers and capacitors containing a liquid that will burn shall be installed only in vaults complying with 450.41 through 450.48, and, in addition, (1), (2), and (3) shall apply. Doors or other openings communicating with the Division 1 location shall have self-closing fire doors on both sides of the wall, and the doors shall be carefully fitted and provided with suitable seals (such as weather stripping) to minimize the entrance of dust into the vault.Vent openings and ducts shall communicate only with the outside air.Suitable pressure-relief openings communicating with the outside air shall be provided. [502.100(A)(1)](https://2023.antflix.net#502.100(A)(1)) | https://2023.antflix.net#502.100(A)(1) |
Chaptewr 5 Special Occupancies | 502.100(A)(2) | Transformers and capacitors that do not contain a liquid that will burn shall be installed in vaults complying with 450.41 through 450.48 or be identified as a complete assembly, including terminal connections. [502.100(A)(2)](https://2023.antflix.net#502.100(A)(2)) | https://2023.antflix.net#502.100(A)(2) |
Chaptewr 5 Special Occupancies | 502.100(A)(3) | No transformer or capacitor shall be installed in a Class II, Division 1, Group E location. [502.100(A)(3)](https://2023.antflix.net#502.100(A)(3)) | https://2023.antflix.net#502.100(A)(3) |
Chaptewr 5 Special Occupancies | 502.100(B) | In Class II, Division 2 locations, transformers and capacitors shall comply with 502.100(B)(1) through (B)(3). [502.100(B)](https://2023.antflix.net#502.100(B)) | https://2023.antflix.net#502.100(B) |
Chaptewr 5 Special Occupancies | 502.100(B)(1) | Transformers and capacitors containing a liquid that will burn shall be installed in vaults that comply with 450.41 through 450.48. [502.100(B)(1)](https://2023.antflix.net#502.100(B)(1)) | https://2023.antflix.net#502.100(B)(1) |
Chaptewr 5 Special Occupancies | 502.100(B)(2) | Transformers containing askarel and rated in excess of 25 kVA shall be as follows: Provided with pressure-relief ventsProvided with a means for absorbing any gases generated by arcing inside the case, or the pressure-relief vents shall be connected to a chimney or flue that will carry such gases outside the buildingHave an airspace of not less than 150 mm (6 in.) between the transformer cases and any adjacent combustible material [502.100(B)(2)](https://2023.antflix.net#502.100(B)(2)) | https://2023.antflix.net#502.100(B)(2) |
Chaptewr 5 Special Occupancies | 502.100(B)(3) | Dry-type transformers shall be installed in vaults or shall have their windings and terminal connections enclosed in tight metal housings without ventilating or other openings and shall operate at not over 600 volts, nominal. [502.100(B)(3)](https://2023.antflix.net#502.100(B)(3)) | https://2023.antflix.net#502.100(B)(3) |
Chaptewr 5 Special Occupancies | 502.115(A) | In Class II, Division 1 locations, switches, circuit breakers, motor controllers, fuses, pushbuttons, relays, and similar devices shall be provided with enclosures identified for the location. [502.115(A)](https://2023.antflix.net#502.115(A)) | https://2023.antflix.net#502.115(A) |
Chaptewr 5 Special Occupancies | 502.115(B) | In Class IL Division 2 locations, enclosures for fuses, switches, circuit breakers, and motor controllers, including push buttons, relays, and similar devices, shall be dusttight or otherwise identified for the location. [502.115(B)](https://2023.antflix.net#502.115(B)) | https://2023.antflix.net#502.115(B) |
Chaptewr 5 Special Occupancies | 502.120(A) | In Class II Division 1 locations, control transformers, solenoids, impedance coils, resistors, and any overcurrent devices or switching mechanisms associated with them shall be provided with enclosures identified for the location. [502.120(A)](https://2023.antflix.net#502.120(A)) | https://2023.antflix.net#502.120(A) |
Chaptewr 5 Special Occupancies | 502.120(B) | In Class II, Division 2 locations, transformers and resistors shall comply with 502.120(B)(1) through (B)(3). [502.120(B)](https://2023.antflix.net#502.120(B)) | https://2023.antflix.net#502.120(B) |
Chaptewr 5 Special Occupancies | 502.120(B)(1) | Switching mechanisms (including overcurrent devices) associated with control transformers, solenoids, impedance coils, and resistors shall be provided with enclosures that are dusttight or otherwise identified for the location. [502.120(B)(1)](https://2023.antflix.net#502.120(B)(1)) | https://2023.antflix.net#502.120(B)(1) |
Chaptewr 5 Special Occupancies | 502.120(B)(2) | Where not located in the same enclosure with switching mechanisms, control transformers, solenoids, and impedance coils shall be provided with enclosures that are dusttight or otherwise identified for the location. [502.120(B)(2)](https://2023.antflix.net#502.120(B)(2)) | https://2023.antflix.net#502.120(B)(2) |
Chaptewr 5 Special Occupancies | 502.120(B)(3) | Resistors and resistance devices shall have dust-ignitionproof enclosures that are dusttight or otherwise identified for the location. [502.120(B)(3)](https://2023.antflix.net#502.120(B)(3)) | https://2023.antflix.net#502.120(B)(3) |
Chaptewr 5 Special Occupancies | 502.125(A) | In Class II, Division 1 locations, motors, generators, and other rotating electrical machinery shall be in conformance with either of the following: Identified for the locationTotally enclosed pipe-ventilated [502.125(A)](https://2023.antflix.net#502.125(A)) | https://2023.antflix.net#502.125(A) |
Chaptewr 5 Special Occupancies | 502.125(B) | In Class II, Division 2 locations, motors, generators, and other rotating electrical equipment shall be totally enclosed nonventilated, totally enclosed pipe-ventilated, totally enclosed water-air-cooled, totally enclosed fan-cooled, or dust-ignitionproof, for which maximum full-load external temperature shall be in accordance with 500.8(D)(2) for normal operation when operating in free air (not dust blanketed) and shall have no external openings. Exception: If the authority having jurisdiction believes accumulations of nonconductive, nonabrasive dust will be moderate and if machines can be easily reached for routine cleaning and maintenance, the following shall be permitted to be installed: (1) Standard open-type machines without sliding contacts, centrifugal or other types of switching mechanism (including motor over-current, overloading, and overtemperature devices), or integral resistance devices (2) Standard open-type machines with such contacts, switching mechanisms, or resistance devices enclosed within dusttight housings without ventilating or other openings (3) Self-cleaning textile motors of the squirrel-cage type (4) Machines with sealed bearings, bearing isolators, and seals [502.125(B)](https://2023.antflix.net#502.125(B)) | https://2023.antflix.net#502.125(B) |
Chaptewr 5 Special Occupancies | 502.128 | Ventilating pipes for motors, generators, or other rotating electrical machinery, or for enclosures for electrical equipment, shall be of metal not less than 0.53 mm (0.021 in.) in thickness or of equally substantial noncombustible material and shall comply with all of the following: Lead directly to a source of clean air outside of buildingsBe screened at the outer ends to prevent the entrance of small animals or birdsBe protected against physical damage and against rusting or other corrosive influencesVentilating pipes shall also comply with 502.128(A) and (B). [502.128](https://2023.antflix.net#502.128) | https://2023.antflix.net#502.128 |
Chaptewr 5 Special Occupancies | 502.128(A) | In Class II, Division 1 locations, ventilating pipes, including their connections to motors or to the dust-ignitionproof enclosures for other equipment, shall be dusttight throughout their length. For metal pipes, seams and joints shall comply with one of the following: Be riveted and solderedBe bolted and solderedBe weldedBe rendered dusttight by some other equally effective means [502.128(A)](https://2023.antflix.net#502.128(A)) | https://2023.antflix.net#502.128(A) |
Chaptewr 5 Special Occupancies | 502.128(B) | In Class II, Division 2 locations, ventilating pipes and their connections shall be sufficiently tight to prevent the entrance of appreciable quantities of dust into the ventilated equipment or enclosure and to prevent the escape of sparks, flame, or burning material that might ignite dust accumulations or combustible material in the vicinity. For metal pipes, lock seams and riveted or welded joints shall be permitted; and tight-fitting slip joints shall be permitted where some flexibility is necessary, as at connections to motors. [502.128(B)](https://2023.antflix.net#502.128(B)) | https://2023.antflix.net#502.128(B) |
Chaptewr 5 Special Occupancies | 502.130(A) | In Class II, Division 1 locations, luminaires for fixed and portable lighting shall comply with 502.130(A)(1) through (A)(4). [502.130(A)](https://2023.antflix.net#502.130(A)) | https://2023.antflix.net#502.130(A) |
Chaptewr 5 Special Occupancies | 502.130(A)(1) | Each luminaire shall be identified for the location and shall be clearly marked to indicate the type and maximum wattage of the lamp for which it is designed. [502.130(A)(1)](https://2023.antflix.net#502.130(A)(1)) | https://2023.antflix.net#502.130(A)(1) |
Chaptewr 5 Special Occupancies | 502.130(A)(2) | Each luminaire shall be protected against physical damage by a suitable guard or by location. [502.130(A)(2)](https://2023.antflix.net#502.130(A)(2)) | https://2023.antflix.net#502.130(A)(2) |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.