Ditribution Panel with 2 sources / 2 buses

[stevdan]

Hi,
I need a 120/208V Panel mainly will be used for 3 phases load ( circuit breakers ). so the circuit breakers on right side will have separate bus than the one on the left side.
I am avoiding putting 2 separate panels due to space.

Thank you

 

[augie47]

doubt u will find such a critter.. not sure it would be NEC compliant if it were made.

 

[bori]

I do not know much, and what I am about to write will confirm it. If 135 on the let use all Three bus bars, and 246 use the same Three. How do you plan to divide the load?.:dunce:

 

[JFletcher]

Welcome

Hi,
I need a 120/208V Panel mainly will be used for 3 phases load ( circuit breakers ). so the circuit breakers on right side will have separate bus than the one on the left side.
I am avoiding putting 2 separate panels due to space.

Thank you

I have never seen a 3ph panel with 6 buss bars that could be fed by 2 3ph services. Several questions for you:

How many total 3ph circuits will you have?

Why cant you mount a second panel below the first?

Are your 2 208Y/120V transformers different sizes? If not, you should be able to tie them together, and if they are, would it be cost prohibitive to replace them with a single xfmr?

can you use an 84 circuit panel like this:

http://www.gordonelectricsupply.com...7RtLqDhoWM0jXXYLuMBQ5W0TDeEt4EuCxEaAkoa8P8HAQ??

 

[sahanservice]

Hi,
I need a 120/208V Panel mainly will be used for 3 phases load ( circuit breakers ). so the circuit breakers on right side will have separate bus than the one on the left side.
I am avoiding putting 2 separate panels due to space.

Thank you

Mate,
If you are using two separate supplies, i would tend to use a seperate panel for each source for clarity and safety compliance ! NP: electrical panels dont operate like a comms switch!!

Re
MJ

 

[ggunn]

Welcome



I have never seen a 3ph panel with 6 buss bars that could be fed by 2 3ph services.

I have, but the two sources were mutually exclusive. It was a MV MDP at an airport connected to two substations for redundancy. The MDP could connect to one substation or the other, but not to both at the same time.

 

[kwired]

Hi,
I need a 120/208V Panel mainly will be used for 3 phases load ( circuit breakers ). so the circuit breakers on right side will have separate bus than the one on the left side.
I am avoiding putting 2 separate panels due to space.

Thank you

Why do you think you need two separate panels or sets of bus? You can combine single and three phase loads in the same panel to include single, double and three pole circuits, with or without neutrals.

Sometimes it is more desirable with a high leg delta system to have a "power panel" and a "lighting panel" where the lighting panel doesn't have the high leg, but is still totally optional and not a requirement.

 

[Tony S]

I have, but the two sources were mutually exclusive. It was a MV MDP at an airport connected to two substations for redundancy. The MDP could connect to one substation or the other, but not to both at the same time.

For MV dual busbars are quite common. Normally they are off load switching to transfer between busbar sets, some have on load transfer switches but they have the added complication of paralleling breakers.