Feeder Taps confuse me....

Status
Not open for further replies.
Re: Feeder Taps confuse me....

For all those questions the OCPD will have to be 225 or 250 amps as those are the standard sizes available.

The real question is how far you can run before you hit the OCPD.

If the distance from the tap to this panel is less than 25' you can tap the 400 amp feed with 230 amp conductors and the panel OCPD will protect these conductors.

If the distance is not much farther than 25' (outside the allowable tap distance) it will be cheaper to run 400 amp rated conductors to the panel.

At some distance it will become cheaper to install a OCPD at the tap so you can run 230 amp conductors to the panel.

I hope this makes sense.
 
Re: Feeder Taps confuse me....

Originally posted by iwire:
For all those questions the OCPD will have to be 225 or 250 amps as those are the standard sizes available.

The real question is how far you can run before you hit the OCPD.

If the distance from the tap to this panel is less than 25' you can tap the 400 amp feed with 230 amp conductors and the panel OCPD will protect these conductors.

If the distance is not much farther than 25' (outside the allowable tap distance) it will be cheaper to run 400 amp rated conductors to the panel.

At some distance it will become cheaper to install a OCPD at the tap so you can run 230 amp conductors to the panel.

I hope this makes sense.
Click to expand...
By 230A, I mean 225A. 230A, 75 degree wire ampacity. :)
 
Re: Feeder Taps confuse me....

Glad I could help.

This one was pretty straight forward as your tap conductors where clearly larger than one third the size of the feeder conductors.

Make the feeder 800 amps with a 225 amp tap and the tap conductors would (for the 25' foot tap) have to be rated at least 267 amps.

Bob
 
Status
Not open for further replies.
Top