NEC requirements minimum distance a transformer must be installed from a wall.
- Thread starter pete25
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Take a look at 450.9 and 450.21. There are different applications based on a few different factors.
- Location
- Logan, Utah
I agree with Rob.
The required distance for ventilation will be marked on the transformer nameplate. 6" sticks in my mind as a pretty standard ventilation distance requirement for most dry type transformers that I have installed.
Chris
The required distance for ventilation will be marked on the transformer nameplate. 6" sticks in my mind as a pretty standard ventilation distance requirement for most dry type transformers that I have installed.
Chris
joebell
Senior Member
- Location
- New Hampshire
Installation Instructions
Installation Instructions
I have found the spacing info in the installation instructions of the transformer.
Installation Instructions
I have found the spacing info in the installation instructions of the transformer.
- Location
- Logan, Utah
Not saying you are wrong, but 450.9 requires the clearances to be clearly marked on the transformer.
Chris
claytazdaisy
Member
6 inches from wall to side and rear. working room in front depends on size on transformer
ericsherman37
Senior Member
- Location
- Oregon Coast
Well aren't there some transformers that mount on a wall?
Yes... so I'm guessing there would be minimal clearance from the wall on which they are mounted... :grin:
ericsherman37
Senior Member
- Location
- Oregon Coast
Someone just needs to invent some sort of anti-gravitational device so electrical equipment can float in mid-air.
Then the electrician could wear an anti-gravitational tool belt and float up to work on the equipment. Minimal hazard of being grounded while working on energized parts
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
As Joebell mentioned, there are some manufacturers that have relief from the 6 inch requirement we see on so many transformers.
It usually depends on the ventilation of the transformer, and the fire rating of the wall surface.
It usually depends on the ventilation of the transformer, and the fire rating of the wall surface.
Ventilated transformers usually require 6".
Enclosed, non-vented transformers can be mounted on the wall. (These are usually the smaller transformers, but if you want to pay enough, I think you can also get large enclosed transfomers.)
Not sure, but there also may be differences in sealed, enclosed, and/or non-vented transformers.
Enclosed, non-vented transformers can be mounted on the wall. (These are usually the smaller transformers, but if you want to pay enough, I think you can also get large enclosed transfomers.)
Not sure, but there also may be differences in sealed, enclosed, and/or non-vented transformers.
Wall-mount transformers still have side and front clearance-for-ventilation spec's.
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