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Panel Board and Transformer Working Clearances

Panel Board and Transformer Working Clearances

Panel Board and Transformer Working Clearances

(OP)
I have seen several installations that the contractor installs a dry type transformer  above the associated panel to maximum the space in the electrical room.  I was confronted by a Vendor who sold Unitized Power Centers that had a Panelboad and Xfmr in an enclosure that looks more like an MCC.  The Vendor stated that the transformer mounted above the panel is in violation on the NEC.  I can not find anywhere in the code that states that installing the transformer above is in violation.  Is this a case where the slaesman is blowing smoke or does he have a valid argument.  I have been in this business for 12 years and have seen many electrical rooms set up with the transformers above the panel.  Any advice to this is greatly appreciated

RE: Panel Board and Transformer Working Clearances

See Article 110.  It depends on the relative depth of the transformer compared to the panelboard.  Above 6.5 feet (AFF), it's not a problem.  Below that, the depth of the transformer cannot be more than 6" greater than the panelboard.

At least the last time I checked..

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