cable temp. rating used on dry type transformer

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ezwages

Member
Location
alabama
I had a question today and not sure how to find an answer.
co-worker found contractor using 90c rated cabled on a transformer rated as 220c <> 150c rise. He has made the assumption that the cable is under rated for the transformer based on temperature rating. disregard conductor sizing. how can i prove this might not be true?
--ez
 

david luchini

Moderator
Staff member
Location
Connecticut
Occupation
Engineer
I had a question today and not sure how to find an answer.
co-worker found contractor using 90c rated cabled on a transformer rated as 220c <> 150c rise. He has made the assumption that the cable is under rated for the transformer based on temperature rating. disregard conductor sizing. how can i prove this might not be true?
--ez

The is no correlation between conductor insulation rating and transformer insulation rating. A properly sized 75 deg conductor would be acceptable.
 

winnie

Senior Member
Location
Springfield, MA, USA
Occupation
Electric motor research
The transformer should have a label saying something like 'field wiring below this line' or some such. The transformer coils could reach rather high temperature, so 90C wire has to be kept away from the coils. Properly following the instructions makes lower temp wire perfectly acceptable for the connections.

Jon
 
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