This article was posted 12/15/2006 and is most likely outdated.

Article 250 Grounding and Bonding 250.2
 

 
Topic - Article 250 Grounding and Bonding 250.2

December 15, 2006  

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Grounding and Bonding

250.2 Definitions

Part I. General

Additional text helps the Code user understand that the purpose of the effective ground fault current path is to help clear a ground-fault by facilitating the operation of the overcurrent device.

Effective Ground-Fault Current Path. An intentionally constructed, permanent, low-impedance conductive path designed to carry fault current from the point of a ground fault on a wiring system to the grounded neutral point at the electrical supply source. Figure 250-1

The effective ground-fault current path is intended to facilitate the operation of the circuit overcurrent protective device, or the ground-fault detector on a high-impedance grounded system. Figure 250-2



Figure 250-1
(Click on image to enlarge)


Figure 250-2
(Click on image to enlarge)

     
 
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Comments

  • Mike,When a ground fault occurs,the metal enclosure of faulted device rises almost to 120v/2=60v.A quick disconnection of power supply is needed.From the images provided here, it seems that by placing the panel near to the load,this could be achieved.But this is not true.Since the current return path is longer farther is the secondary of the utility distribution transformer,the effective ground return path may not be effective in some installations such that in case of fault, the overload device may not be fast enough to clear fault to prevent injury.

    T.M.Haja sahib
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