250.2 Definitions Continued
Grounding (Earthing) Electrode . A device that establishes an electrical connection to the earth. Figure 250.11
See 250.50 through 250.70Grounding Electrode (Earth) Conductor . 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 . 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
For more details, see 250.24(A)(4), 250.28, and 408.3(C).Solidly Grounded . The intentional electrical connection of one system terminal to the equipment grounding (bonding) conductor in accordance with 250.30(A)(1).
Figure 250.14 The industry calls a system that has one terminal bonded to its metal case a solidly grounded system.System Bonding Jumper . 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
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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