rayp1
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- Phoenix, Az, USA
What is the working clearance required around a dry type transformer?
Dry Type Transformers
- Thread starter rayp1
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- Lockport, IL
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- Retired Electrical Engineer
That has been a matter of some debate. My opinion is that working clearance is not required, and that the only space that needs to be maintained is whatever the manufacturer says about giving it room to conduct its heat away. I leave a minimum of 6 inches for that purpose. Others will contend that you can't do thermographic studies unless the covers are off and the transformer is energized, and they would invoke 110.26 on that basis. This might have to be a question for your local AHJ.
rayp1
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- Location
- Phoenix, Az, USA
Thank you. I found under article 450.13 transformers require accessibility for installation and maintenance.
Charlie is right on. A minimum of 6" is the clearance.
To fine to that a bit it has to be mounted on something so if its the floor its 6" from the adjacent walls. If the mounting surface is a well then it should be 6" from others surfaces including the floor. I believe the is per NEMA STDs which is and industry accepted standard and not for a single manufacturer. And of course working clearances would also be taken into considered.
To fine to that a bit it has to be mounted on something so if its the floor its 6" from the adjacent walls. If the mounting surface is a well then it should be 6" from others surfaces including the floor. I believe the is per NEMA STDs which is and industry accepted standard and not for a single manufacturer. And of course working clearances would also be taken into considered.
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