2020 NEC Code Reference

Indexed GIES field reference for article lookup, bookmarks, and local notes. Full NEC text is not bundled.

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Article 250 - Grounding / Bonding

Grounding vs Bonding

Ref: Article 250 · grounding, bonding, EGC, GEC

Grounding connects the system or equipment to earth; bonding establishes electrical continuity and an effective ground-fault current path. Exception/watch: Services,...

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Other Metal Piping Bonding

Ref: 250.104(B) · gas pipe, bonding, metal piping

Other metal piping systems likely to become energized shall be bonded as required by 250.104(B). Exception/watch: CSST systems can have manufacturer instructions and...

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Metal Water Pipe / Electrode

Ref: 250.50; 250.52(A)(1); 250.53(D); 250.104(A) · water pipe, GEC, bonding, electrode

If a metal underground water pipe qualifies as a grounding electrode, it shall be included in the grounding electrode system. Exception/watch: Electrode qualification depends...

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Grounding Electrode System

Ref: 250.50; 250.52; 250.53 · grounding electrode, ufer, ground rod

All grounding electrodes described in 250.52(A)(1) through (A)(7) that are present at a building or structure shall be bonded together to form the grounding electrode system....

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Service Bonding

Ref: 250.24; 250.28 · service, main bonding jumper, neutral bond

The grounded service conductor shall be connected to the grounding electrode system as required by 250.24. Exception/watch: Existing installations and separately derived...

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Separately Derived Systems

Ref: 250.30 · transformer, SDS, bonding

Separately derived alternating-current systems shall be grounded and bonded in accordance with 250.30 where required. Exception/watch: Some systems are not separately derived...

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