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Subject - 10 tap rule
wilyumfk45 I have (2) 480 3 phase pumps, (1) compressor (1) dryer, they each draw only 62.5 amp & 5 amp nominally. can they both be feed from on only breaker 80' away only no more space available.
lctrc789 I am not sure of this perhaps some of these guys can jump in here and help me out on this one.
But If you follow the guidelines from 240-21 b (4) and 430-28, and 430-53. Also 430-24 you can do this.
Ryan_J No. The motors must be sized at 125% of the largest motor, plus 100% of all other motors for feeder circuits.
nino To size the overcurrent protection for a feeder supplying two or more motors read 430-62 in electrical code.
wareagle Ryan
Why can't you have a feeder with a large breaker and have taps to 4 panels, 1 for each motor?
wilyumfk45 Thanks to everyone that contributes to this forum, the code ref. plus professionalism I get here is great, it helps me to know the code and develop relations with the Electrical community,keep up with the responses.

In Your Service

Bill
Ryan_J
quote:
Originally posted by wareagle

Ryan
Why can't you have a feeder with a large breaker and have taps to 4 panels, 1 for each motor?



You could, but you would still have to comply with 430.24. Just becasue you are tapping a feeder doesn't mean that 215.2 and 430.24 don't apply to the tapped feeder. In the question asked, the amperage is way to high to do this with an 80 amp breaker, unless a few exceptions are met.

quote:
430.24 Several Motors or a Motor(s) and Other Load(s).
Conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than 125 percent of the full-load current rating of the highest rated motor plus the sum of the full-load current ratings of all the other motors in the group, as determined by 430.6(A), plus the ampacity required for the other loads.
Romex Racer He never mentioned the size of the breaker.
Ryan_J I wonder if I read it as being an 80 amp breaker?

oops..... :(