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25 mobile homes rated @ 15000 KVA each. What is the minimum size service? Im getting 375A? Please tell me if this is correct or goes to 400A??

This was a test question??

25 x 15000 = 375,000
Table 550.31 Derate @24% 375,000 x .24% = 90,000
90,000/240V = 375A

:eek:
 

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RIP 1959-2015
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39,618 Posts
25 mobile homes rated @ 15000 KVA each. What is the minimum size service? Im getting 375A? Please tell me if this is correct or goes to 400A??

This was a test question??

25 x 15000 = 375,000
Table 550.31 Derate @24% 375,000 x .24% = 90,000
90,000/240V = 375A

:eek:
550.10 = 50 amps.

Welcome to ET.
 

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animal lover /rat bastard
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13,543 Posts
your thread title is minimum feeder. your post says minimum service size. which is it ?

however, fwiw, 230.42 says

(B) Specific Installations. In addition to the requirements
of 230.42(A), the minimum ampacity for ungrounded conductors
for specific installations shall not be less than the
rating of the service disconnecting means specified in
230.79(A) through (D).
which, to me, means 400A.
 
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