Separately derived

Status
Not open for further replies.
C

codequestion

Banned
Location
MD, USA
I have transformer 13.2kv primary to 208/120V secondary . Secondary phase conductors are 5 sets of 4-500 kcmil. The supply side bonding jumper I get per table 250.120 (c)(1) for the transformer secondary is 350 kcmil. However i am not sure if it should be 350 kcmil each since i have 5 sets for each phase conductor giving 15 total or 350 kcmil for each phase giving 3 total or one 350 kcmil total in one conduit?

Sent from my SM-G935U using Tapatalk
 
Last edited:
codequestion said:
I have transformer 13.2kv primary to 208/120V secondary . Secondary phase conductors are 5 sets of 4-500 kcmil. The supply side bonding jumper I get per table 250.120 (c)(1) for the transformer secondary is 350 kcmil. However i am not sure if it should be 350 kcmil each since i have 5 sets for each phase conductor giving 15 total or 350 kcmil for each phase giving 3 total or one 350 kcmil total in one conduit?

Sent from my SM-G935U using Tapatalk
Click to expand...

250.102(C)(2)- one 350 kcmil SSBJ for each raceway.
 
packersparky said:
250.102(C)(2)- one 350 kcmil SSBJ for each raceway.
Click to expand...
We read that differently. If his phase conductor is each conduit is a 500 he only need to size the supply side bonding jumper is each conduit to be a 1/0.
 
augie47 said:
We read that differently. If his phase conductor is each conduit is a 500 he only need to size the supply side bonding jumper is each conduit to be a 1/0.
Click to expand...

I agree. Just size the SSBJ according to the conductors within each raceway or waste a lot of money and install a 350 kcmil in each raceway. :)
 
augie47 said:
We read that differently. If his phase conductor is each conduit is a 500 he only need to size the supply side bonding jumper is each conduit to be a 1/0.
Click to expand...
Is their a rule for up sizing SSBJ if phase conductors are up sized due to voltage drop or 1/0 each conduit is sufficient?

Sent from my SM-G935U using Tapatalk
 
Based on phase conductor size. Does your Code book have a Tabel 250.102(C)(1) ?
 
Status
Not open for further replies.
Top