I have an industrial installation that I need to create a single point disconnect mechanism for and I am looking for your insight into what is the "correct" way to do it.
The equipment consists of the following:
1.) Motion control workstation - 120V @ 25A single phase
2.) Laser - 480V @ 10A three phase
3.) Liquid chiller - 480V @ 15A three phase
I have a 480V three phase supply that I need to route through the single disconnect source and to the equipment listed above. (All three pieces are standalone and each also have local disconnects as well.)
My ideas are this:
1.) Buy a standard grey box wall mounted disconnect switch and wire all three pieces of equipment into it with three different cables. (The problem that I see with this method is that the conductor overload protection in the disconnect box would be serving all three cables and I would have to use much larger conductor sizes than necessary to insure that the fuses would protect the conductors.) Is this item feasable or is is also invalid because I would have three supply cables coming from one disconnect / overload switch?
2.) Manufacture a separate box which has the 480V three phase coming into it, go through one disconnect switch, and then route to three sets of overload protection inside the box before routing this power to the different pieces of equipment. This way each piece of equipment's supply cable would have individual overload protection. (Secondly, if the cables ran to the equipment is less than 15' I think I can get rid of the overload protection entirely.) This box would also have a transformer in it to convert the 480V three phase to 120VAC single phase.
3.) Bring the 480V three phase into my main control workstation (1 above) e-box and split the source up inside it before sending it out to the other two pieces of equipment. (I don't like this idea very much because our system is primarily low voltage derived from 120 VAC and I don't really want to have 480V three phase in this box if I don't have to.) Secondly, the box is already pretty tight and I would have to re-configure it.
The equipment consists of the following:
1.) Motion control workstation - 120V @ 25A single phase
2.) Laser - 480V @ 10A three phase
3.) Liquid chiller - 480V @ 15A three phase
I have a 480V three phase supply that I need to route through the single disconnect source and to the equipment listed above. (All three pieces are standalone and each also have local disconnects as well.)
My ideas are this:
1.) Buy a standard grey box wall mounted disconnect switch and wire all three pieces of equipment into it with three different cables. (The problem that I see with this method is that the conductor overload protection in the disconnect box would be serving all three cables and I would have to use much larger conductor sizes than necessary to insure that the fuses would protect the conductors.) Is this item feasable or is is also invalid because I would have three supply cables coming from one disconnect / overload switch?
2.) Manufacture a separate box which has the 480V three phase coming into it, go through one disconnect switch, and then route to three sets of overload protection inside the box before routing this power to the different pieces of equipment. This way each piece of equipment's supply cable would have individual overload protection. (Secondly, if the cables ran to the equipment is less than 15' I think I can get rid of the overload protection entirely.) This box would also have a transformer in it to convert the 480V three phase to 120VAC single phase.
3.) Bring the 480V three phase into my main control workstation (1 above) e-box and split the source up inside it before sending it out to the other two pieces of equipment. (I don't like this idea very much because our system is primarily low voltage derived from 120 VAC and I don't really want to have 480V three phase in this box if I don't have to.) Secondly, the box is already pretty tight and I would have to re-configure it.
