Poco Xfmr Clearance

[sceepe]

A coworker just told me that "code" requires a pad mount transformer to be at least 36" from a building and not in front of any windows. Is this true. Is 230.9 the basis for this? If so does 230.9 apply to underground service conductors???

Thanks

 

[jim dungar]

This is not an area covered by the NEC. However, many building codes and insurance companies as well as POCOs have their own codes and rules.

 

[mike0w]

Clearance

Clearance

I believe this is something you need to discuss with the local AHJ and utility company, in my experiences typically 8'-10' clearance in the front of the xfmr, and depending if it is oil filled or dry type. Your utility company should have a sketch or some guidelines they can provide to you when completing your design. I have a sketch from the local utility company it appears out of their service planner binder that gives me clearances for outdoor pad mounted xfmrs with different circuminstances, for ex: within 5'0" of a door, exterior windows and at what elevation, distance from a corner of the bldg. etc.
Hope this helps.

 

[cpal]

FYI

http://www.nationalgridus.com/non_html/shared_construction_greenbk.pdf

This is from a POCO in MASS but my guess is there is little differece from the general rules.

try pages 109-110

good luck