This article was posted 01/26/2007 and is most likely outdated.

Article 250 Grounding and Bonding 250.34
 

 
Subject - Article 250 Grounding and Bonding 250.34

January 26, 2007  

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Grounding and Bonding

250.34 Generators – Portable and Vehicle-Mounted

Revision clarifies when portable and vehicle-mounted generators are not required to be grounded to a grounding electrode.

(A) Portable Generators. The frame of a portable generator isn’t required to be grounded to a grounding electrode as defined in 250.52 if: Figure 250-13
(1) The generator only supplies equipment or receptacles mounted on the generator, and (2) The metal parts of the generator and the receptacle terminal for the connection of the equipment grounding (bonding) conductor are bonded to the generator frame.

(B) Vehicle-Mounted Generators. The frame of a vehicle-mounted generator isn’t required to be grounded to a grounding electrode as defined in 250.52 if: Figure 250-14
(1) The generator frame is bonded to the vehicle frame,
(2) The generator only supplies equipment or receptacles mounted on the vehicle or generator, and
(3) The metal parts of the generator and the receptacle terminal for the connection of the equipment grounding (bonding) conductor are bonded to the generator frame.



Figure 250-13
(Click on image to enlarge)


Figure 250-14
(Click on image to enlarge)

     
 
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Comments

  • Dear Mike,

    In case there is a leakage at the handtool and at the same time the portable generator frame is touching the ground, the earth fault current might pass through the operator body and return to the generator frame thus injure the operator. Therefore Is it better to bond the workpiece with the generator frame so that the operator is working inside an equipotential zone.

    Michael
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