This article was posted 09/29/2006 and is most likely outdated.

Article 100 General: System Bonding Jumper
 

 
Subject - Article 100 General: System Bonding Jumper

September 29, 2006  

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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).


Figure 100-1
(Click on image to enlarge)

       

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Comments

  • The bonding jumper from xo to the frame of the transformer is an equipment bonding jumper. The system bonding jumper is the wire from xo to the equipment grounding bar in the panel shown. 250.30A1 states that an unspliced SBJ must be installed between the equipment grounding conductors of the sep. derived system and the grounded conductor. The equipment grounding conductors originate at the first overcurrent device. Any grounding/bonding conductor on the supply side of this overcurrent device is always an equipment bonding jumper not an equipment grounding conductor. One end of the SBJ will always connect to the grounding bar in the enclosure with the first overcurrent device as this is the source of the equipment grounding conductors. See NEC Handbook 2005 or 2008 exhibit 250.13 and exhibit 250.14 for correct connections (in article 250.30) thanks - Harry

    harry MILLER
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