question about clearance around a panel

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bolthead

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I have a superintendant that insists that he failed an inspection due to a transformer sitting next to a panel. He called "His Guy" who told him I needed to place the transformer 30" away from the edge of the panel. I know thios is not right according to 110.26. I am looking for some backing here. The 30"s is the total clearance in front of the panel, extending out 36"s from the front of the panel. The disconnect serving the transformer will mount 3' above the transformer(the height of the equipment), outside of the 30" clearance established by the panel. A little "printable back up" on this subject would be great, i have locked horns with this super and the inspector, i proved myself right once and now he is wanting me to prove everything to him.
Thanks
 
only thing you said that sounded a bit questionable was that the disconnect was mounted above the transformer. The disconnect would require the same 110.26 clearances as the panel.
 
thanks for the quick response. I am going to mount the discon. above the xfrmr. maintaining 30" all around from center. sound right now?
 
bolthead said:
thanks for the quick response. I am going to mount the discon. above the xfrmr. maintaining 30" all around from center. sound right now?
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What about the 36" front clearance?

On another note, mounting the disconnect above the transformer might require some ambient temp adjustments IMO.

Roger
 
Only because you said:

... I am going to mount the discon. above the xfrmr. maintaining 30" all around from center. sound right now?
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Well, OK, I don't know about that, but my story is this. (( local ))

Our local line in respects to this is that you can't be back behind less than 6" from the front of the two structures. (panel and trough, trough to trough, panel to disconnect. This seperation difference that the op stated is never as critical as the 6" from the face, of another electrical device.
In a Service situation!

A trough as an example, have something above / below but not be back less than 6" to the face of the trough. I can't say that I've even installed a disconnect over a trannie though....

I don't know about the 30" all around "the area", the apron of dedicated space / what this area represents.
IE Is from the face of the panel edges out.

We also get the owner ship of space above the top of a panel/can to the ceiling unless there's a drop ceiling ...

Frankly you looking at the Box, the box is that "zone" outward based on its amperage also!
 
I always try to explain it this way about panel clearances, if you install a panel and then could fit a box that a refrigerator would come in, in front of it, you should be pretty good.
 
On this same note I personally do not require the prescriptive working clearances per table 110.26 (A)(1) in front of a transformer due to not likely to be energized while servicing. BTW a "Trannie" is something a hillbilly refers to as a transmission in a vehicle.:smile:
 
bolthead said:
. . . I needed to place the transformer 30" away from the edge of the panel.
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I am not sure I understand your description. But one thing is certain. There is no rule that prohibits a transformer from being right next to a panel. The rule is that there must be a space 30 inches wide, 36 inches (or more, depending on voltage level and what is across from the panel) deep, and 6.5 feet high. That space can begin at the left edge of the panel, and include the 22 inch width of the panel plus 8 more inches on the right side. If you have 30 inches clear in this way, then you can put the transformer?s right edge just below the panel?s left edge.
 
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