I have a situation where I need to supply power to the outside of a building for many outlets. My amp draw is around 100 amps of ampacity for all outlets involved. The building is feed from a 400 amp 3 phase, 120/208 volt service. The building has a 400 amp 3 phase, fused main disconnect. On the load side of the fuses in the main disconnect, the conductors leave the side of the can via a LB.
On the inside of the building, the 400 amp conductors terminate into a I line MDP panel. The MDP is full with feeds going to subpanels. The subpanels are fairly full and the entire distrubition is buried into the depths of the building.
The situation is that I need to put my 100 amp outside distribution panel very close to the 400 amp outside service disconnect.
It would be extremely practical for me to use the outside tap rule, or for the matter, even the 10 foot tap rule and feed my panel off the load side of the 400 amp disconnect.
To put a junction box off the side of the main disconnect is not going to be feasible or economical. Its would be very tough to put in some sort of junction box.
My question is this: How would I find out if the load side terminals are listed for something like a double lug set up. I have seen this done in the past, but was not sure if it was NEC approved. If I don?t make a tap outside at the main disconnect, I will need to go back into the building proper and try to find another way to get my 100 amp distribution panel back out at the service. Any suggestions would be appreciated!
Thanks in advance!
On the inside of the building, the 400 amp conductors terminate into a I line MDP panel. The MDP is full with feeds going to subpanels. The subpanels are fairly full and the entire distrubition is buried into the depths of the building.
The situation is that I need to put my 100 amp outside distribution panel very close to the 400 amp outside service disconnect.
It would be extremely practical for me to use the outside tap rule, or for the matter, even the 10 foot tap rule and feed my panel off the load side of the 400 amp disconnect.
To put a junction box off the side of the main disconnect is not going to be feasible or economical. Its would be very tough to put in some sort of junction box.
My question is this: How would I find out if the load side terminals are listed for something like a double lug set up. I have seen this done in the past, but was not sure if it was NEC approved. If I don?t make a tap outside at the main disconnect, I will need to go back into the building proper and try to find another way to get my 100 amp distribution panel back out at the service. Any suggestions would be appreciated!
Thanks in advance!
