Additional OCPD Required For Secondary Conductors

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Rob D

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I have a 13.8 kv feeder feeding a single transformer primary with the proper sized cables for full load and the same for the secondary cables at forced air application which also terminates at a single main breaker in a SWGR line up. One of our vendors mentioned we needed to place an additional breaker for the secondary cables near the secondary ATC to protect them if the run was to be over 25 feet.

So my question is: If the primary breaker is a dedicated feed to a transformer no mater its placement in the same building or another building and it is properly protected on over current (thus the secondary would be properly protected since it was sized for the forced air application and installation style) why would it need another OCPD if it terminates to another single breaker in a SWGR lineup with the proper trip unit to protect everything else and why would the distance of cable matter for either the primary or secondary?

Thanks for the help.
 

iceworm

Curmudgeon still using printed IEEE Color Books
Location
North of the 65 parallel
Occupation
EE (Field - as little design as possible)
The applicable code sections are in 240.21.

Specifically check at 240.21.C.2, .3, .6 first.

ice
 
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