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250.30(B) 3 & 250.30 (C) #213394
04/21/14 02:40 PM
04/21/14 02:40 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 840
Michigan
Outdoor transformer Customer owned 13.8 Pri.
480/277 Secondary. Bond at Transformer as Required 250.30 (C)
sized by 250.66. 3 phases from Transformer Plus Ground to ist OCP. Can it be Bare Conductors (Parallel) & Must be sized by 250.66 as it's before OCP.
250.30 (B) 3.
Phase Conductors 6 sets of 750's .
750 x6 = 4500 x 12.5 % =5625.
Grounding conductor must be 600 mcm each conduit.
Your imput ?

2017 / 2014 NEC & Related Books and Study Guides
Re: 250.30(B) 3 & 250.30 (C) [Re: Yoopersup] #213418
04/25/14 01:39 PM
04/25/14 01:39 PM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 840
Michigan
Questions are incase I didn't state them correctly?
Can a bare SSBJ be installed between the XO at the secondary of the transformer to the Switchgear with the phase conductors?? (there is no Neutral just 3 phases & SSBJ.

Second: system bonding jumper must be sized by 250.66????

Yoopers UP
see above post for details



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