Neutral Conductor

[Cards]

I am replacing a meter bank on a multi family dwelling. This is a single phase 120/240 V system. The feeders are rated for 125 A. I am going to set a trough and pipe over to one side of the MB. I will run 3 sets of feeders in the conduit. The inspector says I must count each neutral as a current carrying conductor. Unless I am not reading this correctly 310-15 (B) (5) says only 3-wire circuit of a 4-wire,3-phase wye connected system be counted. So instead of 6 current carriers I now have 9. That will make a big difference on my end. I would appreciate some feedback

 

[Dennis Alwon]

Basically a 3 wire feeder neutral conductor nstalled in a single phase panel would NOT be counted as a current carrying conductor.

 

[Smart $]

Basically a 3 wire feeder neutral conductor nstalled in a single phase panel would NOT be counted as a current carrying conductor.

...including 3 sets of 120/240 1Ø 3W feeders. The inspector may be thinking it is a 120/208 setup from 208/120 source.

 

[infinity]

I am replacing a meter bank on a multi family dwelling. This is a single phase 120/240 V system. The feeders are rated for 125 A. I am going to set a trough and pipe over to one side of the MB. I will run 3 sets of feeders in the conduit. The inspector says I must count each neutral as a current carrying conductor. Unless I am not reading this correctly 310-15 (B) (5) says only 3-wire circuit of a 4-wire,3-phase wye connected system be counted. So instead of 6 current carriers I now have 9. That will make a big difference on my end. I would appreciate some feedback

You are correct, the inspector is wrong on this one.

 

[kwired]

Make sure inspector realizes you have 180 degree vs 120 degree phase differential and understands the requirement associated with each.