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Illustrated Changes to the NEC, 2005 Edition - Part 1

Article 100

General

System Bonding Jumper

A new term “system bonding jumper” was added for use with separately derived systems. Previously the term “main bonding jumper” was used to describe the bonding jumper that was installed between the metal case of a derived system and one of the separately derived system conductors.

Bonding Jumper, System. The conductor, screw or strap that bonds the metal parts (equipment grounding (bonding) conductor) of a separately derived system to the grounded conductor (typically the X0 terminal at a transformer). Figure 100-1
Author’s Comment: The system bonding jumper provides the low-impedance path to the source neutral for fault current to facilitate the clearing of the fault by opening the circuit protection device. For more information see 250.4(A)(5), 250.28 and 250.30(A)(1).


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