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Grounding versus Bonding



250.119 Identification of Equipment Grounding (Bonding) Conductor.

Unless required to be insulated, equipment grounding (bonding) conductors can be bare.

Author's Comment: Equipment grounding (bonding) conductors must be insulated for patient care equipment [517.13(B)] and permanently installed pool, outdoor spa, and outdoor hot tub equipment [680.21(A)(1), 680.23(F)(2), and 680.25(B)].
Individually covered or insulated equipment grounding (bonding) conductors must have a continuous outer finish that is either green or green with one or more yellow stripes.

Author's Comment: Isolated ground circuits [250.96(B)] and isolated ground receptacles [250.146(D)] frequently use a green insulated conductor for equipment and a green insulated conductor with yellow stripes for the sensitive electronic equipment. Figures 250.165 and 250.166
Conductors with insulation that is green, or green with one or more yellow stripes cannot be used for an ungrounded or grounded neutral conductor. Figure 250.167

Author's Comment: The NEC neither requires nor prohibits the use of the color green for the identification of bonding and grounding electrode conductors. Figure 250.168
(A) Conductors Larger Than 6 AWG

(1) Identified Where Accessible. Equipment grounding (bondAČing) conductors larger than 6 AWG that are insulated can be permanently reidentified at the time of installation at every point where the conductor is accessible.

Exception: Identification of equipment grounding (bonding) conductors larger than 6 AWG in conduit bodies is not required.

(2) Identification Method. Equipment grounding (bonding) conductor identification must encircle the conductor and be accomplished by one of the following:
(a) Stripping exposed insulation
(b) Coloring exposed insulation green
(c) Marking exposed insulation with green tape or green adhesive labels

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