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Grounding versus Bonding

PART I.

Sections

250.2 Definitions Continued

Grounding (Earthing) Electrode [100]. A device that establishes an electrical connection to the earth. Figure 250–11

Author’s Comment: See 250.50 through 250.70
Grounding Electrode (Earth) Conductor [100]. The conductor that connects the grounded neutral conductor at service equipment [250.24(A)], the building or structure disconnecting means enclosure [250.32(A)], or separately derived systems enclosure [250.30(A)] to an electrode (earth). Figure 250–12

Main Bonding Jumper [100]. A conductor, screw, or strap that bonds the equipment grounding (bonding) conductor at service equipment to the grounded neutral service conductor in accordance with 250.24(B). Figure 250–13

Author’s Comment: For more details, see 250.24(A)(4), 250.28, and 408.3(C).
Solidly Grounded [100]. The intentional electrical connection of one system terminal to the equipment grounding (bonding) conductor in accordance with 250.30(A)(1).

Author’s Comment: The industry calls a system that has one terminal bonded to its metal case a solidly grounded system. Figure 250–14
System Bonding Jumper [100]. The conductor, screw, or strap that bonds the metal parts of a separately derived system to a system winding in accordance with 250.30(A)(1). Figure 250–15

Author’s Comment: The system bonding jumper provides the low-impedance fault-current path to the electrical supply source for the purpose of clearing the ground fault. For more information see 250.4(A)(5), 250.28, and 250.30(A)(1).


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