I looked at a set of engineered drawings of a single occupancy building.The drawings showed MDP feeding a 225a MLO panel w/ 4/0 cu (double lugs) then fed off other side of double lug w/ #3cu feeding another 225a MLO panel within 25 ft of each other. (Calculated load on second 225a was around 80a) Is this a code violation as drawn? Would feed from first panel to second 225a be considered a tap and feeds terminate on breaker instead of MLO?
engineer right or wrong
- Thread starter trex
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mcelweec@gmail.com
CMAC1
- Location
- NYC
- Occupation
- Electrician
second panel would require a main breaker
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
The 3 AWG conductors are considered tap conductors, and would be required to follow the tap rules of 240.21(B).
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Agreed, they would need overcurrent protection or your conductors to the second panel would need to be #4/0 as well.
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