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In ground splice box2/18/2024 (B) Equipment Grounding Conductor Continuity. Connections and splices shall be made in accordance with 110.14(B) except that insulation shall not be required. 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 and 250.148(A) through ( D) One or more equipment grounding conductors brought into a nonmetallic outlet box shall be arranged such that a connection can be made to any fitting or device in that box requiring grounding.Ģ50.148 Continuity of Equipment Grounding Conductors and Attachment in Boxes. A connection shall be made between the one or more equipment grounding conductors and a metal box by means of a grounding screw that shall be used for no other purpose, equipment listed for grounding, or a listed grounding device. The arrangement of grounding connections shall be such that the disconnection or the removal of a receptacle, luminaire, or other device fed from the box does not interfere with or interrupt the grounding continuity. ![]() Where circuit conductors are spliced within a box, or terminated on equipment within or supported by a box, any equipment grounding conductor(s) associated with those circuit conductors shall be connected within the box or to the box with devices suitable for the use in accordance with 250.148(A) through (E). Once there, click on their link to free access to the 2020 NEC ® edition of NFPA 70.Ģ50.148 Continuity and Attachment of Equipment Grounding Conductors to Boxes. See the actual NEC ® text at NFPA.ORG for the complete code section. A public comment made it clear that it was overkill to require every single equipment grounding conductor in an enclosure to be tied together with others from a particular circuit that happen to be spliced inside the box.īelow is a preview of the NEC ®. The remaining subsections were slightly reworded to improve usability.Ī proposal was accepted at the first draft meeting but reversed at the second draft meeting that would have required all equipment grounding conductors within a box to be spliced together even if they were just passing through the box without a splice. In a plastic box, continuity is maintained between the equipment grounding conductors by joining them together inside the box rather than connecting them “to” the box. Some boxes are plastic and continuity to a plastic box cannot be maintained. This small change was needed since not all boxes are metal or provide continuity. The section title was changed from Continuity and Attachment of Equipment Grounding Conductors to Boxes to Continuity of Equipment Grounding Conductors and Attachment in Boxes. In the 2020 NEC ®, this section was revised for clarity. Once there, click on their link to free access to the 2017 NEC ® edition of NFPA 70.Code Change Summary: Revised code language clarifies the continuity of equipment grounding conductors and attachment in boxes. Requiring the equipment grounding conductors of all spliced circuits in a box to be connected to the metal box ensures that a metal box with several different sized equipment grounding conductors will be properly grounded for the largest fault condition likely to be imposed on the box.īelow is a preview of Article 250. This would render the box insufficiently grounded in the event that the largest circuit in the box faulted and energized the metal box. ![]() The old code language, if misapplied, could allow just one of the equipment grounding conductors to make connection to the box possibly even the smallest equipment grounding conductor inside the box. ![]() Sometimes, a box may contain several different sized circuits, each requiring a specific sized equipment grounding conductor. In the 2017 NEC ®, “all” equipment grounding conductors of circuits spliced inside the box need to be connected to the box. The previous wording required “any” equipment grounding conductor to be connected to the box. The 2014 language in this section was a bit misleading and did not best represent what the code section was intending to accomplish. When conductors are spliced inside a box or terminated to equipment in/connected to the box, the equipment grounding conductors for those circuits must connect to the metal box. Code Change Summary: Clarifications were made regarding the connection of equipment grounding conductors in a box.
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