I have a metal enclosure bolted to a metal casing of a motor which also is bonded to building steel. I understand in a hazardous location that all noncurrent carrying conductive material shall be connected together in a manner that establishes an effective ground-fault current path. I am being told that I need to provide an external bond between the box and the casing. I am not seeing the necessity of this or what is gained. . The (4) 1/2" bolts through the back of the enclosure holding it to the casing seems to provide an effective ground path and provide adequate mechanical connection. I am getting a resistance value of .2ohms from the enclosure to building steel. Am I off base on this, or is there something that is in the code requiring an external bond that I am missing?
External bond for a metal enclosure that is bolted to metal casing?
- Thread starter Hubl3r
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- New Jersey
- Occupation
- Journeyman Electrician
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Bond a metal enclosure bolted to metal casing
I have a metal enclosure bolted to a metal casing of a motor which also is bonded to building steel. I am being told that I need to provide an external bond between the box and the casing. I am not seeing the necessity of this or what is gained. I understand that all noncurrent carrying...
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