Building your own breaker panel

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Bmxer883

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Hello so we have a fresh room that will have a few 480v machines. My boss wants to have a breaker panel but I don't see many small amperage 3 phase panels. So he want us to build our own with just taking a junction box and adding din rail mount 3 phase breakers. Then out of junction box out to machine these are low amp machines biggest one has a 15kva 480x208 transformer 3phase.

We have 60amp 480 3phase coming in that will go to junction then another 30amp that will go to a transformer for 120/240 panel. Is there any code that calls out using the din rail mount breakers instead of a normal breaker? I was thinking just run to fused disconnects instead of a panel but i think they want options for future equipment
 
Such a thing would not have a listing similar to those AHJs are used to seeing in this counrry for distribution equipment. An AHJ could cite 110.3(A)(1) and state they want listing or labeling of the assembly, which you wouldn't have. See informational note #2 there; although it's not binding in the NEC, an AHJ has the prerogative to make it binding.
 
Be careful of using just any DIN rail breaker. Most of them are not rated for NEC branch circuit protection. You need breakers listed to UL489.
 
Use deep, steel din rail, not shallow aluminum. If you don't have lockable disconnects at each piece of field equipment, consider mounting disconnects on the front of your panel.
 
Bmxer883 said:
Hello so we have a fresh room that will have a few 480v machines. My boss wants to have a breaker panel but I don't see many small amperage 3 phase panels. So he want us to build our own with just taking a junction box and adding din rail mount 3 phase breakers. Then out of junction box out to machine these are low amp machines biggest one has a 15kva 480x208 transformer 3phase.

We have 60amp 480 3phase coming in that will go to junction then another 30amp that will go to a transformer for 120/240 panel. Is there any code that calls out using the din rail mount breakers instead of a normal breaker? I was thinking just run to fused disconnects instead of a panel but i think they want options for future equipment
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I am not sure why you would even consider this. Square D type NF panelboard, go to your favorite supplier, tell them what you need for # of circuits you only need an MLO, the bus rating will likely be 250A but who cares.
 
Strathead said:
I am not sure why you would even consider this. Square D type NF panelboard, go to your favorite supplier, tell them what you need for # of circuits you only need an MLO, the bus rating will likely be 250A but who cares.
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This is actually exactly what I wanted I just seen they have a 125amp panel that would work great. Company may not like the prices but its the correct way to go about it I believe.
 
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