400 Amp Disconnect feeding two 200 amp main breaker panel

[Kevin C]

Hi guys

I'm planning to feed two 200 amp main breaker panels from a 400 amp fused disconnect (Main disconnect after the meter provided by the building). If I ran all the wire to the disconnect load side lugs, am I still subject to the 25' tap rule?

Thanks.

 

[kwired]

Hi guys

I'm planning to feed two 200 amp main breaker panels from a 400 amp fused disconnect (Main disconnect after the meter provided by the building). If I ran all the wire to the disconnect load side lugs, am I still subject to the 25' tap rule?

Thanks.

Any feeder conductor that is protected above it's ampacity, other then those that fall under the "next size up rule", is a feeder tap conductor and must comply with 240.21(B).

If your panels are close to one another but more then 25 feet from the 400 amp feeder device, you could always run parallel (3/0 copper) conductors to a splice box, or even a gutter if both panels are adjacent to one another, within 25 feet of the panels and then have taps from the splice box/gutter to the panels. Up to the splice box it is a 400 amp feeder and no tap rules apply to that portion.

 

[Kevin C]

Any feeder conductor that is protected above it's ampacity, other then those that fall under the "next size up rule", is a feeder tap conductor and must comply with 240.21(B).

If your panels are close to one another but more then 25 feet from the 400 amp feeder device, you could always run parallel (3/0 copper) conductors to a splice box, or even a gutter if both panels are adjacent to one another, within 25 feet of the panels and then have taps from the splice box/gutter to the panels. Up to the splice box it is a 400 amp feeder and no tap rules apply to that portion.

Thank you.