Generator to feed building

[bth0mas20]

A customer wants to run a machine shop at his residence from a welder generator. This will generate 3 ph 480v 30amps, and 120/240v single phase 30amps. Their will be no electrical service to this detached garage.

The plan is to set this generator on a pad 2 ft from the outside of the building. Use 2 seperate twist lock cords...one from 480v and the other from the 240v. I would use so cord to an outside j box on each then go thru the wall directly to a panel on each. This means their will be a 3 ph 480v panel and a 240v single phase panel.

From the 480v panel I will power 3 pieces of equipment.
From the 240v panel I will power lights and outlets.

What are the requirements for a code install. Im concerned about having 2 sources of power....yet their still comming from the same generator. Both of the sources will have twist lock plugs to disconnect power if needed.

Am I missing any show stoppers here?


My other option that is very costly:
Get a 480v 3ph to 120/208 3ph delta wye step down xfmr and power a single panel for everything.....equipment and lights/outlets.

All of the equipment is now setup for 208v 3ph but I plan to replace starters and re wire motors to support 480v if I go that route.

Thanks in advance

 

[hillbilly1]

I don't really see any major issues, code allows two services to a building if two different voltages are needed, and it sounds like everything will be grouped together.

 

[bth0mas20]

Thats what I was thinking. Do you see any issue using flexable cord approx 7ft long to each connection on the generator. I wont terminate the so cord in the panel. I will install a jbox for each feed outside the building and splice to thhn to enter the panels.

Does this sound like the right way to you or is their an easier method?

 

[zbang]

Sounds OK, but make sure that everything is bonded correctly and that the neutrals an grounds are separated except at the bonding jumpers.

 

[satcom]

The only problem may be if it is in a residential zone, there may be a problem with the noise we have many homeowners that have pool pump noise issues, so permits and location and placement of the gen may be an issue.

 

[bth0mas20]

Im trying to find a 480 to 208/120 at the right price. This would mean only one feed pluged into the 480v connection on the gen and only one panel. This 208 3 ph panel can feed everything in the barn without rewiring the equipment and starter coils.