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Chapter 4 Equipment for General Use | 425.22(C) | The supplementary over-current protective devices for the subdivided loads specified in 425.22(B) shall comply with the following: Be factory installed within or on the heater enclosure or supplied for use with the heater as a separate assembly by the heater manufacturerBe accessible but not be required to be readily accessibleBe suitable for branch-circuit protectionInformational Note No. 1: See 240.10. Where cartridge fuses are used to provide this overcurrent protection, a single disconnecting means shall be permitted to be used for the several subdivided loads.Informational Note No. 2: See 240.10 for supplementary over-current protection.Informational Note No. 3: See 240.40 for disconnecting means for cartridge fuses in circuits of any voltage. [425.22(C)](https://2023.antflix.net#425.22(C)) | https://2023.antflix.net#425.22(C) |
Chapter 4 Equipment for General Use | 425.22(D) | The conductors supplying the supplementary overcurrent protective devices shall be considered branch-circuit conductors. Where the heaters are rated 50 kW or more, the conductors supplying the supplementary overcurrent protective devices specified in 425.22(C) shall be permitted to be sized at not less than 100 percent of the nameplate rating of the heater, provided all of the following conditions are met:The heater is marked with a minimum conductor size.The conductors are not smaller than the marked minimum size.A temperature-actuated device controls the cyclic operation of the equipment. [425.22(D)](https://2023.antflix.net#425.22(D)) | https://2023.antflix.net#425.22(D) |
Chapter 4 Equipment for General Use | 425.22(E) | Field-wired conductors between the heater and the supplementary overcurrent protective devices for fixed industrial process heating equipment shall be sized at not less than 125 percent of the load served. The supplementary overcurrent protective devices specified in 425.22(C) shall protect these conductors in accordance with 240.4. Where the heaters are rated 50 kW or more, the ampacity of field-wired conductors between the heater and the supplementary overcurrent protective devices shall be permitted to be not less than 100 percent of the load of their respective subdivided circuits, provided all of the following conditions are met: The heater is marked with a minimum conductor size.The conductors are not smaller than the marked minimum size.A temperature-activated device controls the cyclic operation of the equipment. [425.22(E)](https://2023.antflix.net#425.22(E)) | https://2023.antflix.net#425.22(E) |
Chapter 4 Equipment for General Use | 425.28(A) | Fixed industrial process heating equipment shall be provided with a nameplate identifying the manufacturer and the rating in volts and watts or in volts and amperes. Fixed industrial process heating equipment intended for use on alternating current only, direct current only, or both shall be marked to so indicate. The marking of equipment consisting of motors over 1/8 hp and other loads shall specify the rating of the motor in volts, amperes, and frequency and the heating load in volts and watts or in volts and amperes. [425.28(A)](https://2023.antflix.net#425.28(A)) | https://2023.antflix.net#425.28(A) |
Chapter 4 Equipment for General Use | 425.28(B) | This nameplate shall be located so as to be permanent and shall be visible or accessible after installation. [425.28(B)](https://2023.antflix.net#425.28(B)) | https://2023.antflix.net#425.28(B) |
Chapter 4 Equipment for General Use | 425.29 | All heating elements that are replaceable in the field and are part of industrial process heating equipment shall be legibly marked with the ratings in volts and watts or in volts and amperes. [425.29](https://2023.antflix.net#425.29) | https://2023.antflix.net#425.29 |
Chapter 4 Equipment for General Use | 425.45 | Concealed fixed industrial heating equipment installations shall be made with due care to prevent damage to the heating equipment and shall be inspected and approved before heating equipment is covered or concealed. [425.45](https://2023.antflix.net#425.45) | https://2023.antflix.net#425.45 |
Chapter 4 Equipment for General Use | 425.57 | Part V shall apply to any heater mounted in the airstream of a forced-air system where the air-moving unit is not provided as an integral part of the equipment. [425.57](https://2023.antflix.net#425.57) | https://2023.antflix.net#425.57 |
Chapter 4 Equipment for General Use | 425.58 | Heaters installed in an air duct shall be identified as suitable for the installation. [425.58](https://2023.antflix.net#425.58) | https://2023.antflix.net#425.58 |
Chapter 4 Equipment for General Use | 425.59 | Means shall be provided to ensure uniform airflow over the face of the heater in accordance with the manufacturer's instructions. Informational Note: Some heaters installed within 1.2 m (4 ft) of the outlet of an air-moving device, elbows, baffle plates, or other obstructions in ductwork use turning vanes, pressure plates, or other devices on the inlet side of the duct heater to ensure an even distribution of air over the face of the heater. [425.59](https://2023.antflix.net#425.59) | https://2023.antflix.net#425.59 |
Chapter 4 Equipment for General Use | 425.60 | Duct heaters intended for use with elevated inlet air temperature shall be identified as suitable for use at the elevated temperatures. [425.60](https://2023.antflix.net#425.60) | https://2023.antflix.net#425.60 |
Chapter 4 Equipment for General Use | 425.63 | Means shall be provided to ensure that the fan circuit, where present, is energized when any heater circuit is energized. However, time- or temperature-controlled delay in energizing the fan motor shall be permitted. [425.63](https://2023.antflix.net#425.63) | https://2023.antflix.net#425.63 |
Chapter 4 Equipment for General Use | 425.64 | Each duct heater shall be provided with an integral, automatic-reset temperature-limiting control or controllers to de-energize the circuit or circuits. In addition, an integral independent supplementary control or controllers shall be provided in each duct heater that disconnects a sufficient number of conductors to interrupt heating element current flow. This device shall be manually resettable or replaceable. [425.64](https://2023.antflix.net#425.64) | https://2023.antflix.net#425.64 |
Chapter 4 Equipment for General Use | 425.65 | Duct heater controller equipment shall be either accessible with the disconnecting means installed at or within sight from the controller or as permitted by 425.19(A). [425.65](https://2023.antflix.net#425.65) | https://2023.antflix.net#425.65 |
Chapter 4 Equipment for General Use | 425.70 | The provisions in Part VI of this article shall apply to boilers employing resistance-type heating elements. Electrode-type boilers shall not be considered as employing resistance-type heating elements. See Part VII of this article. [425.70](https://2023.antflix.net#425.70) | https://2023.antflix.net#425.70 |
Chapter 4 Equipment for General Use | 425.71 | Resistance-type boilers shall be identified as suitable for the installation. [425.71](https://2023.antflix.net#425.71) | https://2023.antflix.net#425.71 |
Chapter 4 Equipment for General Use | 425.72(A) | A boiler employing resistance-type immersion heating elements contained in an ASME-rated and stamped vessel shall have the heating elements protected at not more than 150 amperes. Such a boiler rated more than 120 amperes shall have the heating elements subdivided into loads not exceeding 120 amperes. Where a subdivided load is less than 120 amperes, the rating of the overcurrent protective device shall comply with 425.4(B). [425.72(A)](https://2023.antflix.net#425.72(A)) | https://2023.antflix.net#425.72(A) |
Chapter 4 Equipment for General Use | 425.72(B) | A boiler employing resistance-type heating elements not contained in an ASME-rated and stamped vessel shall have the heating elements protected at not more than 60 amperes. Such a boiler rated more than 48 amperes shall have the heating elements subdivided into loads not exceeding 48 amperes. Where a subdivided load is less than 48 amperes, the rating of the overcurrent protective device shall comply with 425.4(B). [425.72(B)](https://2023.antflix.net#425.72(B)) | https://2023.antflix.net#425.72(B) |
Chapter 4 Equipment for General Use | 425.72(C) | The supplementary overcurrent protective devices for the subdivided loads as required by 425.72(A) and (B) shall be as follows: Factory-installed within or on the boiler enclosure or provided as a separate assembly by the boiler manufacturer.Accessible, but need not be readily accessible. [425.72(C)](https://2023.antflix.net#425.72(C)) | https://2023.antflix.net#425.72(C) |
Chapter 4 Equipment for General Use | 425.72(D) | Where cartridge fuses are used to provide this overcurrent protection, a single disconnecting means shall be permitted for the several subdivided circuits. See 240.40. [425.72(D)](https://2023.antflix.net#425.72(D)) | https://2023.antflix.net#425.72(D) |
Chapter 4 Equipment for General Use | 425.72(E) | The conductors supplying these supplementary overcurrent protective devices shall be considered branch-circuit conductors. Where the heaters are rated 50 kW or more, the conductors supplying the overcurrent protective device specified in 424.72(C) shall be permitted to be sized at not less than 100 percent of the nameplate rating of the heater, provided all of the following conditions are met: The heater is marked with a minimum conductor size.The conductors are not smaller than the marked minimum size.A temperature- or pressure-actuated device controls the cyclic operation of the equipment. [425.72(E)](https://2023.antflix.net#425.72(E)) | https://2023.antflix.net#425.72(E) |
Chapter 4 Equipment for General Use | 425.72(F) | Field-wired conductors between the heater and the supplementary overcurrent protective devices shall be sized at not less than 125 percent of the load served. The supplementary overcurrent protective devices specified in 425.72(C) shall protect these conductors in accordance with 240.4. Where the heaters are rated 50 kW or more, the ampacity of field-wired conductors between the heater and the supplementary overcurrent protective devices shall be permitted to be not less than 100 percent of the load of their respective subdivided circuits, provided all of the following conditions are met: The heater is marked with a minimum conductor size.The conductors are not smaller than the marked minimum size.A temperature-activated device controls the cyclic operation of the equipment. [425.72(F)](https://2023.antflix.net#425.72(F)) | https://2023.antflix.net#425.72(F) |
Chapter 4 Equipment for General Use | 425.73 | Each boiler designed so that in normal operation there is no change in state of the heat transfer medium shall be equipped with a temperature-sensitive limiting means. It shall be installed to limit maximum liquid temperature and shall directly or indirectly disconnect all ungrounded conductors to the heating elements. Such means shall be in addition to a temperature-regulating system and other devices protecting the tank against excessive pressure. [425.73](https://2023.antflix.net#425.73) | https://2023.antflix.net#425.73 |
Chapter 4 Equipment for General Use | 425.74 | Each boiler designed so that in normal operation there is a change in state of the heat transfer medium from liquid to vapor shall be equipped with a pressure-sensitive limiting means. It shall be installed to limit maximum pressure and shall directly or indirectly disconnect all ungrounded conductors to the heating elements. Such means shall be in addition to a pressure-regulating system and other devices protecting the tank against excessive pressure. [425.74](https://2023.antflix.net#425.74) | https://2023.antflix.net#425.74 |
Chapter 4 Equipment for General Use | 425.80 | The provisions in Part VII of this article shall apply to boilers for operation at 600 volts, nominal, or less, in which heat is generated by the passage of current between electrodes through the liquid being heated. [425.80](https://2023.antflix.net#425.80) | https://2023.antflix.net#425.80 |
Chapter 4 Equipment for General Use | 425.81 | Electrode-type boilers shall be identified as suitable for the installation. [425.81](https://2023.antflix.net#425.81) | https://2023.antflix.net#425.81 |
Chapter 4 Equipment for General Use | 425.82 | The size of branch-circuit conductors and overcurrent protective devices shall be calculated on the basis of 125 percent of the total load (motors not included). A contactor, relay, or other device, listed for continuous operation at 100 percent of its rating, shall be permitted to supply its full-rated load. See 210.19(A)(1), Exception No. 1. This section shall not apply to conductors that form an integral part of an approved boiler. Where an electrode boiler is rated 50 kW or more, the conductors supplying the boiler electrode(s) shall be permitted to be sized at not less than 100 percent of the nameplate rating of the electrode boiler, provided all the following conditions are met:The electrode boiler is marked with a minimum conductor size.The conductors are not smaller than the marked minimum size.A temperature- or pressure-actuated switch controls the cyclic operation of the equipment. [425.82](https://2023.antflix.net#425.82) | https://2023.antflix.net#425.82 |
Chapter 4 Equipment for General Use | 425.83 | Each boiler, designed so that in normal operation there is no change in state of the heat transfer medium, shall be equipped with a temperature-sensitive limiting means. It shall be installed to limit maximum liquid temperature and shall directly or indirectly interrupt all current flow through the electrodes. Such means shall be in addition to the temperature regulating system and other devices protecting the tank against excessive pressure. [425.83](https://2023.antflix.net#425.83) | https://2023.antflix.net#425.83 |
Chapter 4 Equipment for General Use | 425.84 | Each boiler, designed so that in normal operation there is a change in state of the heat transfer medium from liquid to vapor, shall be equipped with a pressure-sensitive limiting means. It shall be installed to limit maximum pressure and shall directly or indirectly interrupt all current flow through the electrodes. Such means shall be in addition to a pressure-regulating system and other devices protecting the tank against excessive pressure. [425.84](https://2023.antflix.net#425.84) | https://2023.antflix.net#425.84 |
Chapter 4 Equipment for General Use | 425.85 | Boilers designed such that fault currents do not pass through the pressure vessel, and the pressure vessel is electrically isolated from the electrodes, all exposed noncurrent-carrying metal parts, including the pressure vessel, supply, and return connecting piping, shall be connected to the equipment grounding conductor. For all other designs, the pressure vessel containing the electrodes shall be isolated and electrically insulated from ground. [425.85](https://2023.antflix.net#425.85) | https://2023.antflix.net#425.85 |
Chapter 4 Equipment for General Use | 425.86 | All electrode-type boilers shall be marked to show the following: The manufacturer's name.The rating in volts, amperes, and kilowatts.The electrical supply required specifying frequency, number of phases, and number of wires.The marking "Electrode-Type Process Heating Boiler."A warning marking, "All Power Supplies Shall Be Disconnected Before Servicing, Including Servicing the Pressure Vessel."A field-applied warning marking or label shall comply with 110.21 (B). The markings shall be permanent and located so as to be visible after installation. [425.86](https://2023.antflix.net#425.86) | https://2023.antflix.net#425.86 |
Chapter 4 Equipment for General Use | 426.1 | This article covers fixed outdoor electric deicing and snow-melting equipment and the installation of these systems. [426.1](https://2023.antflix.net#426.1) | https://2023.antflix.net#426.1 |
Chapter 4 Equipment for General Use | 426.1(A) | Embedded in driveways, walks, steps, and other areas. [426.1(A)](https://2023.antflix.net#426.1(A)) | https://2023.antflix.net#426.1(A) |
Chapter 4 Equipment for General Use | 426.1(B) | Exposed on drainage systems, bridge structures, roofs, and other structures. Informational Note: See ANSI/IEEE 515.1-2012, Standard for the Testing, Design, Installation and Maintenance of Electrical Resistance Trace Heating for Commercial Applications, for further information. See IEEE 844/CSA 293 series of standards for fixed outdoor electric deicing and snow-melting equipment. [426.1(B)](https://2023.antflix.net#426.1(B)) | https://2023.antflix.net#426.1(B) |
Chapter 4 Equipment for General Use | 426.3 | Cord-and-plug-connected fixed outdoor electric deicing and snow-melting equipment shall additionally comply with Table 426.3. Table 426.3 Other Articles Equipment Article Appliances 422 (Parts I, II, III, IV, V) [426.3](https://2023.antflix.net#426.3) | https://2023.antflix.net#426.3 |
Chapter 4 Equipment for General Use | 426.4 | Fixed outdoor electric deicing and snow-melting equipment shall be considered a continuous load. [426.4](https://2023.antflix.net#426.4) | https://2023.antflix.net#426.4 |
Chapter 4 Equipment for General Use | 426.10 | Equipment for outdoor electric deicing and snow melting shall be identified as suitable for the environment and installed in accordance with the manufacturer's instructions. [426.10](https://2023.antflix.net#426.10) | https://2023.antflix.net#426.10 |
Chapter 4 Equipment for General Use | 426.11 | Electric heating equipment shall be installed in such a manner as to be afforded protection from physical damage. [426.11](https://2023.antflix.net#426.11) | https://2023.antflix.net#426.11 |
Chapter 4 Equipment for General Use | 426.12 | External surfaces of outdoor electric deicing and snow-melting equipment that operate at temperatures exceeding 60°C (140°F) shall be physically guarded, isolated, or thermally insulated to protect against contact by personnel in the area. [426.12](https://2023.antflix.net#426.12) | https://2023.antflix.net#426.12 |
Chapter 4 Equipment for General Use | 426.13 | The presence of outdoor electric deicing and snow-melting equipment shall be evident by the posting of appropriate caution signs or markings where clearly visible. [426.13](https://2023.antflix.net#426.13) | https://2023.antflix.net#426.13 |
Chapter 4 Equipment for General Use | 426.20(A) | Panels or units shall not exceed 1300 watts/m2 (120 watts/ft2) of heated area. [426.20(A)](https://2023.antflix.net#426.20(A)) | https://2023.antflix.net#426.20(A) |
Chapter 4 Equipment for General Use | 426.20(B) | The spacing between adjacent cable runs is dependent upon the rating of the cable and shall be not less than 25 mm (1 in.) on centers. [426.20(B)](https://2023.antflix.net#426.20(B)) | https://2023.antflix.net#426.20(B) |
Chapter 4 Equipment for General Use | 426.20(C) | Units, panels, or cables shall be installed as follows: On a substantial concrete, masonry, or asphalt base at least 50 mm (2 in.) thick and have at least 38 mm (11/2 in.) of concrete, masonry, or asphalt applied over the units, panels, or cables; orThey shall be permitted to be installed over other identified bases and embedded within 90 mm (31/2 in.) of concrete, masonry, or asphalt but not less than 38 mm (11/2 in.) from the top surface; orEquipment that has been listed for other forms of installation shall be installed only in the manner for which it has been identified. [426.20(C)](https://2023.antflix.net#426.20(C)) | https://2023.antflix.net#426.20(C) |
Chapter 4 Equipment for General Use | 426.20(D) | Cables, units, and panels shall be secured in place by frames or spreaders or other approved means while the concrete, masonry, or asphalt finish is applied. [426.20(D)](https://2023.antflix.net#426.20(D)) | https://2023.antflix.net#426.20(D) |
Chapter 4 Equipment for General Use | 426.20(E) | Cables, units, and panels shall not be installed where they bridge expansion joints unless provision is made for expansion and contraction. [426.20(E)](https://2023.antflix.net#426.20(E)) | https://2023.antflix.net#426.20(E) |
Chapter 4 Equipment for General Use | 426.21(A) | Heating element assemblies shall be secured to the surface being heated by identified means. [426.21(A)](https://2023.antflix.net#426.21(A)) | https://2023.antflix.net#426.21(A) |
Chapter 4 Equipment for General Use | 426.21(B) | Where the heating element is not in direct contact with the surface being heated, the design of the heater assembly shall be such that its temperature limitations shall not be exceeded. [426.21(B)](https://2023.antflix.net#426.21(B)) | https://2023.antflix.net#426.21(B) |
Chapter 4 Equipment for General Use | 426.21(C) | Heating elements and assemblies shall not be installed where they bridge expansion joints unless provision is made for expansion and contraction. [426.21(C)](https://2023.antflix.net#426.21(C)) | https://2023.antflix.net#426.21(C) |
Chapter 4 Equipment for General Use | 426.21(D) | Where installed on flexible structures, the heating elements and assemblies shall have a flexural capability that is compatible with the structure. [426.21(D)](https://2023.antflix.net#426.21(D)) | https://2023.antflix.net#426.21(D) |
Chapter 4 Equipment for General Use | 426.22(A) | Except as permitted under 426.22(B), nonheating leads installed in concrete, masonry, or asphalt shall be provided with a grounding sheath or braid in accordance with 426.27 or shall be enclosed in rigid metal conduit, electrical metallic tubing, intermediate metal conduit, or other metal raceways. [426.22(A)](https://2023.antflix.net#426.22(A)) | https://2023.antflix.net#426.22(A) |
Chapter 4 Equipment for General Use | 426.22(B) | The splice connection between the nonheating lead and heating element, within concrete, masonry, or asphalt, shall be located no less than 25 mm (1 in.) and no more than 150 mm (6 in.) from the metal raceway. The length of the nonheating lead from the metal raceway to the splice assembly shall be permitted to be provided without a grounding sheath or braid. Grounding continuity shall be maintained. [426.22(B)](https://2023.antflix.net#426.22(B)) | https://2023.antflix.net#426.22(B) |
Chapter 4 Equipment for General Use | 426.22(C) | Insulating bushings shall be used in the concrete, masonry, or asphalt where the leads enter a metal raceway. [426.22(C)](https://2023.antflix.net#426.22(C)) | https://2023.antflix.net#426.22(C) |
Chapter 4 Equipment for General Use | 426.22(D) | Leads shall be protected in expansion joints in accordance with 300.4(H) or installed in accordance with the manufacturer's instructions. [426.22(D)](https://2023.antflix.net#426.22(D)) | https://2023.antflix.net#426.22(D) |
Chapter 4 Equipment for General Use | 426.22(E) | Exposed nonheating leads shall be protected by raceways or other identified means. [426.22(E)](https://2023.antflix.net#426.22(E)) | https://2023.antflix.net#426.22(E) |
Chapter 4 Equipment for General Use | 426.22(F) | Not less than 150 mm (6 in.) of free nonheating lead shall be within the junction box. [426.22(F)](https://2023.antflix.net#426.22(F)) | https://2023.antflix.net#426.22(F) |
Chapter 4 Equipment for General Use | 426.23(A) | Power supply nonheating leads (cold leads) for resistance elements shall be identified for the temperature encountered. Not less than 150 mm (6 in.) of nonheating leads shall be provided within the junction box. Preassembled factory-supplied and field-assembled nonheating leads on approved heaters shall be permitted to be shortened if the markings specified in 426.25 are retained. [426.23(A)](https://2023.antflix.net#426.23(A)) | https://2023.antflix.net#426.23(A) |
Chapter 4 Equipment for General Use | 426.23(B) | Nonheating power supply leads shall be enclosed in a rigid conduit, intermediate metal conduit, electrical metallic tubing, or other approved means. [426.23(B)](https://2023.antflix.net#426.23(B)) | https://2023.antflix.net#426.23(B) |
Chapter 4 Equipment for General Use | 426.24(A) | Electrical connections, other than factory connections of heating elements to nonheating elements embedded in concrete, masonry, or asphalt or on exposed surfaces, shall be made with insulated connectors identified for the use. [426.24(A)](https://2023.antflix.net#426.24(A)) | https://2023.antflix.net#426.24(A) |
Chapter 4 Equipment for General Use | 426.24(B) | Splices and terminations at the end of the nonheating leads, other than the heating element end, shall be installed in a box or fitting in accordance with 110.14 and 300.15. [426.24(B)](https://2023.antflix.net#426.24(B)) | https://2023.antflix.net#426.24(B) |
Chapter 4 Equipment for General Use | 426.25 | Each factory-assembled heating unit shall be legibly marked within 75 mm (3 in.) of each end of the nonheating leads with the permanent identification symbol, catalog number, and ratings in volts and watts or in volts and amperes. [426.25](https://2023.antflix.net#426.25) | https://2023.antflix.net#426.25 |
Chapter 4 Equipment for General Use | 426.26 | Ferrous and nonferrous metal raceways, cable armor, cable sheaths, boxes, fittings, supports, and support hardware shall be permitted to be installed in concrete or in direct contact with the earth, or in areas subject to severe corrosive influences, where made of material suitable for the condition, or where provided with corrosion protection identified as suitable for the condition. [426.26](https://2023.antflix.net#426.26) | https://2023.antflix.net#426.26 |
Chapter 4 Equipment for General Use | 426.27 | Grounding means, such as copper braid, metal sheath, or other approved means, shall be provided as part of the heated section of the cable, panel, or unit. [426.27](https://2023.antflix.net#426.27) | https://2023.antflix.net#426.27 |
Chapter 4 Equipment for General Use | 426.28 | Ground-fault protection shall be provided for fixed outdoor electric deicing and snow-melting equipment. The trip level of ground-fault protection shall be as specified by the manufacturer. [426.28](https://2023.antflix.net#426.28) | https://2023.antflix.net#426.28 |
Chapter 4 Equipment for General Use | 426.30 | Exposed elements of impedance heating systems shall be physically guarded, isolated, or thermally insulated with a weatherproof jacket to protect against contact by personnel in the area. [426.30](https://2023.antflix.net#426.30) | https://2023.antflix.net#426.30 |
Chapter 4 Equipment for General Use | 426.31 | An isolation transformer with a grounded shield between the primary and secondary windings shall be used to isolate the distribution system from the heating system. [426.31](https://2023.antflix.net#426.31) | https://2023.antflix.net#426.31 |
Chapter 4 Equipment for General Use | 426.32 | The secondary winding of the isolation transformer connected to the impedance heating elements shall not have an output voltage greater than 30 volts ac. [426.32](https://2023.antflix.net#426.32) | https://2023.antflix.net#426.32 |
Chapter 4 Equipment for General Use | 426.33 | All current-carrying components shall be installed in accordance with 300.20. [426.33](https://2023.antflix.net#426.33) | https://2023.antflix.net#426.33 |
Chapter 4 Equipment for General Use | 426.40 | The current through the electrically insulated conductor inside the ferromagnetic envelope shall be permitted to exceed the ampacity values shown in Table 310.16, provided it is identified as suitable for this use. [426.40](https://2023.antflix.net#426.40) | https://2023.antflix.net#426.40 |
Chapter 4 Equipment for General Use | 426.41 | Where pull boxes are used, they shall be accessible without excavation by location in suitable vaults or above grade. Outdoor pull boxes shall be of watertight construction. [426.41](https://2023.antflix.net#426.41) | https://2023.antflix.net#426.41 |
Chapter 4 Equipment for General Use | 426.42 | The provisions of 300.20 shall not apply to the installation of a single conductor in a ferromagnetic envelope (metal enclosure). [426.42](https://2023.antflix.net#426.42) | https://2023.antflix.net#426.42 |
Chapter 4 Equipment for General Use | 426.43 | Ferromagnetic envelopes, ferrous or nonferrous metal raceways, boxes, fittings, supports, and support hardware shall be permitted to be installed in concrete or in direct contact with the earth, or in areas subjected to severe corrosive influences, where made of material suitable for the condition, or where provided with corrosion protection identified as suitable for the condition. Corrosion protection shall maintain the original wall thickness of the ferromagnetic envelope. [426.43](https://2023.antflix.net#426.43) | https://2023.antflix.net#426.43 |
Chapter 4 Equipment for General Use | 426.44 | The ferromagnetic envelope shall be connected to an equipment grounding conductor at both ends; and, in addition, it shall be permitted to be connected to an equipment grounding conductor at intermediate points as required by its design. Section 250.30 shall not apply to the installation of skin-effect heating systems. [426.44](https://2023.antflix.net#426.44) | https://2023.antflix.net#426.44 |
Chapter 4 Equipment for General Use | 426.50(A) | All fixed outdoor deicing and snow-melting equipment shall be provided with a means for simultaneous disconnection from all ungrounded conductors. Where readily accessible to the user of the equipment, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means. The disconnecting means shall be of the indicating type and be capable of being locked in the open (off) position. [426.50(A)](https://2023.antflix.net#426.50(A)) | https://2023.antflix.net#426.50(A) |
Chapter 4 Equipment for General Use | 426.50(B) | The factory-installed attachment plug of cord-and-plug-connected equipment rated 20 amperes or less and 150 volts or less to ground shall be permitted to be the disconnecting means. [426.50(B)](https://2023.antflix.net#426.50(B)) | https://2023.antflix.net#426.50(B) |
Chapter 4 Equipment for General Use | 426.51(A) | Temperature-controlled switching devices that indicate an "off" position and that interrupt line current shall open all ungrounded conductors when the control device is in the "off" position. These devices shall not be permitted to serve as the disconnecting means unless they are capable of being locked in the open position in compliance with 110.25. [426.51(A)](https://2023.antflix.net#426.51(A)) | https://2023.antflix.net#426.51(A) |
Chapter 4 Equipment for General Use | 426.51(B) | Temperature controlled switching devices that do not have an "off" position shall not be required to open all ungrounded conductors and shall not be permitted to serve as the disconnecting means. [426.51(B)](https://2023.antflix.net#426.51(B)) | https://2023.antflix.net#426.51(B) |
Chapter 4 Equipment for General Use | 426.51(C) | Remote controlled temperature-actuated devices shall not be required to meet the requirements of 426.51(A). These devices shall not be permitted to serve as the disconnecting means. [426.51(C)](https://2023.antflix.net#426.51(C)) | https://2023.antflix.net#426.51(C) |
Chapter 4 Equipment for General Use | 426.51(D) | Switching devices consisting of combined temperature-actuated devices and manually controlled switches that serve both as the controller and the disconnecting means shall comply with all of the following conditions: Open all ungrounded conductors when manually placed in the "off" positionBe so designed that the circuit cannot be energized automatically if the device has been manually placed in the "off" positionBe capable of being locked in the open position in compliance with 110.25 [426.51(D)](https://2023.antflix.net#426.51(D)) | https://2023.antflix.net#426.51(D) |
Chapter 4 Equipment for General Use | 426.54 | Cord-and-plug-connected deicing and snow-melting equipment shall be listed. [426.54](https://2023.antflix.net#426.54) | https://2023.antflix.net#426.54 |
Chapter 4 Equipment for General Use | 427.1 | This article covers electrically energized heating systems and the installation of these systems used with pipelines and vessels. Informational Note: See IEEE 515-2017, Standard for the Testing, Design, Installation and Maintenance of Electrical Resistance Trace Heating for Industrial Applications, for further information. Also see applicable sections of the IEEE 844/CSA 293 series of standards for alternate technologies for fixed electric heating equipment for pipelines and vessels. [427.1](https://2023.antflix.net#427.1) | https://2023.antflix.net#427.1 |
Chapter 4 Equipment for General Use | 427.3 | Cord-connected pipe heating assemblies shall additionally comply with Table 427.3. Table 427.3 Other Articles Equipment Article Appliances 422 (Parts I, II, III, IV, V) [427.3](https://2023.antflix.net#427.3) | https://2023.antflix.net#427.3 |
Chapter 4 Equipment for General Use | 427.4 | Fixed electric heating equipment for pipelines and vessels shall be considered continuous load. [427.4](https://2023.antflix.net#427.4) | https://2023.antflix.net#427.4 |
Chapter 4 Equipment for General Use | 427.10 | Equipment for pipeline and vessel electric heating shall be identified as being suitable for (1) the chemical, thermal, and physical environment and (2) installation in accordance with the manufacturer's drawings and instructions. [427.10](https://2023.antflix.net#427.10) | https://2023.antflix.net#427.10 |
Chapter 4 Equipment for General Use | 427.11 | Electric heating equipment shall be installed in such a manner as to be afforded protection from physical damage. [427.11](https://2023.antflix.net#427.11) | https://2023.antflix.net#427.11 |
Chapter 4 Equipment for General Use | 427.12 | External surfaces of pipeline and vessel heating equipment that operate at temperatures exceeding 60°C (140°F) shall be physically guarded, isolated, or thermally insulated to protect against contact by personnel in the area. [427.12](https://2023.antflix.net#427.12) | https://2023.antflix.net#427.12 |
Chapter 4 Equipment for General Use | 427.13 | The presence of electrically heated pipelines, vessels, or both, shall be evident by the posting of appropriate caution signs or markings at intervals not exceeding 6 m (20 ft) along the pipeline or vessel and on or adjacent to equipment in the piping system that requires periodic servicing. [427.13](https://2023.antflix.net#427.13) | https://2023.antflix.net#427.13 |
Chapter 4 Equipment for General Use | 427.14 | Heating element assemblies shall be secured to the surface being heated by means other than the thermal insulation. [427.14](https://2023.antflix.net#427.14) | https://2023.antflix.net#427.14 |
Chapter 4 Equipment for General Use | 427.15 | Where the heating element is not in direct contact with the pipeline or vessel being heated, means shall be provided to prevent overtemperature of the heating element unless the design of the heating assembly is such that its temperature limitations will not be exceeded. [427.15](https://2023.antflix.net#427.15) | https://2023.antflix.net#427.15 |
Chapter 4 Equipment for General Use | 427.16 | Heating elements and assemblies shall not be installed where they bridge expansion joints unless provisions are made for expansion and contraction. [427.16](https://2023.antflix.net#427.16) | https://2023.antflix.net#427.16 |
Chapter 4 Equipment for General Use | 427.17 | Where installed on flexible pipelines, the heating elements and assemblies shall have a flexural capability that is compatible with the pipeline. [427.17](https://2023.antflix.net#427.17) | https://2023.antflix.net#427.17 |
Chapter 4 Equipment for General Use | 427.18(A) | Power supply nonheating leads (cold leads) for resistance elements shall be suitable for the temperature encountered. Not less than 150 mm (6 in.) of nonheating leads shall be provided within the junction box. Preassembled factory-supplied and field-assembled nonheating leads on approved heaters shall be permitted to be shortened if the markings specified in 427.20 are retained. [427.18(A)](https://2023.antflix.net#427.18(A)) | https://2023.antflix.net#427.18(A) |
Chapter 4 Equipment for General Use | 427.18(B) | Nonheating power supply leads shall be protected where they emerge from electrically heated pipeline or vessel heating units by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or other raceways identified as suitable for the application. [427.18(B)](https://2023.antflix.net#427.18(B)) | https://2023.antflix.net#427.18(B) |
Chapter 4 Equipment for General Use | 427.18(C) | Interconnecting nonheating leads connecting portions of the heating system shall be permitted to be covered by thermal insulation in the same manner as the heaters. [427.18(C)](https://2023.antflix.net#427.18(C)) | https://2023.antflix.net#427.18(C) |
Chapter 4 Equipment for General Use | 427.19(A) | Nonheating interconnections, where required under thermal insulation, shall be made with insulated connectors identified as suitable for this use. [427.19(A)](https://2023.antflix.net#427.19(A)) | https://2023.antflix.net#427.19(A) |
Chapter 4 Equipment for General Use | 427.19(B) | Splices and terminations outside the thermal insulation shall be installed in a box or fitting in accordance with 110.14 and 300.15. [427.19(B)](https://2023.antflix.net#427.19(B)) | https://2023.antflix.net#427.19(B) |
Chapter 4 Equipment for General Use | 427.20 | Each factory-assembled heating unit shall be legibly marked within 75 mm (3 in.) of the termination end of all nonheating leads with the permanent identification symbol, catalog number, and ratings in volts and watts or in volts and amperes. [427.20](https://2023.antflix.net#427.20) | https://2023.antflix.net#427.20 |
Chapter 4 Equipment for General Use | 427.22 | Ground-fault protection of equipment shall be provided for electric heat tracing and heating panels. This requirement shall not apply in industrial establishments where there is alarm indication of ground faults and the following conditions apply: Conditions of maintenance and supervision ensure that only qualified persons service the installed systems.Continued circuit operation is necessary for safe operation of equipment or processes. [427.22](https://2023.antflix.net#427.22) | https://2023.antflix.net#427.22 |
Chapter 4 Equipment for General Use | 427.23 | Electric heating equipment shall be listed and have a grounded conductive covering in accordance with 427.23(A) or (B). The conductive covering shall provide an effective ground-fault current path for operation of ground-fault protection equipment. [427.23](https://2023.antflix.net#427.23) | https://2023.antflix.net#427.23 |
Chapter 4 Equipment for General Use | 427.23(A) | Heating wires or cables shall have a grounded conductive covering that surrounds the heating element and bus wires, if any, and their electrical insulation. [427.23(A)](https://2023.antflix.net#427.23(A)) | https://2023.antflix.net#427.23(A) |
Chapter 4 Equipment for General Use | 427.23(B) | Heating panels shall have a grounded conductive covering over the heating element and its electrical insulation on the side opposite the side attached to the surface to be heated. [427.23(B)](https://2023.antflix.net#427.23(B)) | https://2023.antflix.net#427.23(B) |
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