2011 nec 314 metal box grounded 314.4 Metal Boxes. Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Article 250 as applicable, except as permitted in 250.112(I). . Anyway here is the article from the 2011 NEC handbook. See the commentary at the end. . provided the box is grounded by the metal raceway and the circuit conductors .
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Metal boxes over 1650 cm3 (100 in.3) in size shall be constructed so as to be of ample strength and rigidity. If of sheet steel, the metal thick‐ ness shall not be less than 1.35 . 314.4 Metal Boxes. Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Article 250 as applicable, except as permitted in 250.112(I). .
For this same reason, metal boxes must be connected to an equipment grounding conductor [314.4] of a type listed in 250.118, if the circuit . NEC 314.4 does not require metal boxes to be grounded due to it’s reference to 250.12(I). I'm concerned about 314.3 which requires the plastic box to have an internal means . Metal boxes over 1650 cm3 (100 in.3) in size shall be constructed so as to be of ample strength and rigidity. If of sheet steel, the metal thick‐ ness shall not be less than 1.35 mm (0.053 in.) uncoated. Grounding Provisions. A means shall be provided in each metal box for the connection of an equipment grounding conductor.
314.4 Metal Boxes. Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Article 250 as applicable, except as permitted in 250.112(I). . Anyway here is the article from the 2011 NEC handbook. See the commentary at the end. . provided the box is grounded by the metal raceway and the circuit conductors . For this same reason, metal boxes must be connected to an equipment grounding conductor [314.4] of a type listed in 250.118, if the circuit they enclose operates at 50V or more. Installation Boxes and conduit bodies in damp or wet locations must prevent moisture from entering or accumulating within the enclosure [314.15].
NEC 314.4 does not require metal boxes to be grounded due to it’s reference to 250.12(I). I'm concerned about 314.3 which requires the plastic box to have an internal means of bonding the conduit entries, which this box does not have. Article 314.3 or 4 don't address bonding or grounding requirements as to me this would be the function of 250.86.
Re: NEC - box grounding-- Don --Your post seems to clear up my original question. NEC 250.4 (A)3 Bonding of Electrical Equipment. I personally accept the requirement of 250.4 (A)3 but some would argu that a metallic raceway is permitted as an equipment grounding conductor and 250.148 would only apply to boxes where splices are made not where . IMO the NEC is pretty explicit in what's required when you use a plastic box with a metal jacketed cable or metallic raceway. One thing to note 314.3 requires the internal bonding means for MC cable in plastic boxes even though the metallic jacket does not qualify as an EGC. Welcome to the Forum.
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A clamp assembly that incorporates a cable termination for the cable conductors shall be listed and marked for use with specific nonmetallic boxes. Conductors that originate within the clamp assembly shall be included in conductor fill calculations covered in 314.16(B)(1) as though they entered from outside the box. The clamp assembly shall not require a fill allowance, but the . The 2011 NEC revision to this section presents the exception in an easier-to-understand list format. In addition, it names more types of raceways that can use this exception. For example, Type RTRC conduit has been added to the list in this exception [314.23(E) Ex]. Outlet Boxes. The 2008 revision of the NEC significantly changed 314.27.
2020 Code Language: 250.148 Continuity of Equipment Grounding Conductors and Attachment in Boxes. If circuit conductors are spliced within a box or terminated on equipment within or supported by a box, all wire-type equipment grounding conductor(s) associated with any of those circuit conductors shall be connected within the box or to the box in accordance with 250.8 . I have always believed when using a metal box with a self grounding receptacle, the ground wire from the incoming cable is connected to the ground screw in the back of the box. . a bond conductor must still be used from the receptacle to the device box. Id be surprised if the NEC does not have a similar rule. 2018 CEC. 12-612(5). Metal boxes over 1650 cm3 (100 in.3) in size shall be constructed so as to be of ample strength and rigidity. If of sheet steel, the metal thick‐ ness shall not be less than 1.35 mm (0.053 in.) uncoated. Grounding Provisions. A means shall be provided in each metal box for the connection of an equipment grounding conductor.
314.4 Metal Boxes. Metal boxes shall be grounded and bonded in accordance with Parts I, IV, V, VI, VII, and X of Article 250 as applicable, except as permitted in 250.112(I). . Anyway here is the article from the 2011 NEC handbook. See the commentary at the end. . provided the box is grounded by the metal raceway and the circuit conductors . For this same reason, metal boxes must be connected to an equipment grounding conductor [314.4] of a type listed in 250.118, if the circuit they enclose operates at 50V or more. Installation Boxes and conduit bodies in damp or wet locations must prevent moisture from entering or accumulating within the enclosure [314.15].
wt metall box
NEC 314.4 does not require metal boxes to be grounded due to it’s reference to 250.12(I). I'm concerned about 314.3 which requires the plastic box to have an internal means of bonding the conduit entries, which this box does not have. Article 314.3 or 4 don't address bonding or grounding requirements as to me this would be the function of 250.86. Re: NEC - box grounding-- Don --Your post seems to clear up my original question. NEC 250.4 (A)3 Bonding of Electrical Equipment. I personally accept the requirement of 250.4 (A)3 but some would argu that a metallic raceway is permitted as an equipment grounding conductor and 250.148 would only apply to boxes where splices are made not where . IMO the NEC is pretty explicit in what's required when you use a plastic box with a metal jacketed cable or metallic raceway. One thing to note 314.3 requires the internal bonding means for MC cable in plastic boxes even though the metallic jacket does not qualify as an EGC. Welcome to the Forum.A clamp assembly that incorporates a cable termination for the cable conductors shall be listed and marked for use with specific nonmetallic boxes. Conductors that originate within the clamp assembly shall be included in conductor fill calculations covered in 314.16(B)(1) as though they entered from outside the box. The clamp assembly shall not require a fill allowance, but the .
The 2011 NEC revision to this section presents the exception in an easier-to-understand list format. In addition, it names more types of raceways that can use this exception. For example, Type RTRC conduit has been added to the list in this exception [314.23(E) Ex]. Outlet Boxes. The 2008 revision of the NEC significantly changed 314.27.2020 Code Language: 250.148 Continuity of Equipment Grounding Conductors and Attachment in Boxes. If circuit conductors are spliced within a box or terminated on equipment within or supported by a box, all wire-type equipment grounding conductor(s) associated with any of those circuit conductors shall be connected within the box or to the box in accordance with 250.8 .
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2011 nec 314 metal box grounded|electrical box grounding