Pull Box Rated at over 1000V

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drkxrider

Member
Location
California
Occupation
Journeyman Electrician
Hello Everyone,
First time posting. I am currently working on a project where we have installed a 36" x 36" x 18" 3R screw cover pull box on the side of a 15KV to 480V transformer. We have a single 4" GRC entering the top of the box with 3 - 1/0, SH, EPR, MV-105, 133%, 15KV cables in it. I am being told by the Inspector that I have to change the box because it is not rated at over 1000V and he quoted 314.70 of the NEC. I have looked through Art.490, 312, and 314 and cannot find anything related to the construction of pull box's with the exception that it must be corrosion resistant, have handles on the door, and be padlockable. Has anyone ever heard of this? I have contacted numerous enclosure manufacturers and they have never heard of this before. Any suggestions?
 
mtnelect

mtnelect

HVAC & Electrical Contractor
Location
Southern California
Occupation
Contractor, C10 & C20 - Semi Retired
Sections 314.40(A), (B), (C) & (D) and Sections 314.70, requires that metal boxes over 100 square inches shall be at least 0.0625 inch thick. "For device boxes and other standard outlet boxes, the means for connecting the equipment grounding conductor as required by 314.40(D) is usually provided by the box manufacturer in the form of a 10-32 tapped hole marked "GR" or "GRD" or the equivalent next to the hole. However, the means provided may not necessarily be used".

So, this might be the problem i.e., thickness of the box.
 
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