I realize the switch would work, that cuts power to keep the pump from coming on (assuming something doesn't fuse the coil closed). But it doesn't actually kill power to the machine.
Being a 7.5HP it's going to have to be hard-wired. Typically code also requires a means to disconnect the power nearby the machine. So unless the breaker panel is close by, a disconnect box would be the proper way to do it.
A 60A disconnect new isn't *that* bad, it's a one-time expense too. You can also check electrical supply places that sell used equipment (disconnects, breakers, lights, etc) and save some money that way. Or CL if you are lucky.
No trying to be an ***... Just trying to err on the side of safety.
code requires a disconnect if compressor is further than 50' and not within sight of panel.
And a pull out AC disconnect accomplishes the same thing for a lot cheaper.
But OPs panel is 40' away so nether is required. The breaker suffices.
Thanks guys for the imput. I just dont understand this is a quincy 7.5 hp max package compressor (not cheap by no means) It comes with a prewired motor starter it would seem like it would have a off on switch. Im wanting to do it right. I will consider putting a disconnect. my breaker box will be about 40 feet away. But here is the thing. If something was to go south more than likely I will be in the main part of the shop and more than likely would be closer to the breaker box than the disconnect. You never know though when or where you'll be. All advise is well taken and thanks but there must be more with the wire to the pressure switch than the disconnect. The issue here is more safety than convenience. I was a Maint. supervisor for 30 years and if it were at the plant I know for a fact the disconnect would be the way to go. Thanks guys. This compressor takes a 75 amp breaker so I guess an 80 amp disconnect will be the way to do it. Thanks again.
why would it seem "like it would have an off on switch"? Nothing requires them. But perhaps the PS has one. Can u post pics?
Is breaker panel within sight of the compressor?
If so U dont need a disconnect since panel is 40' away.
BTW the disconnect is for servicing of the compressor and to prevent someone from getting shocked because of another person coming along and turning the breaker back on while someone is working on it. Has nothing to do with possible potential dangerous situations.
Dont waste money on a disconnect. Breaker is suitable for this. Or if it makes u feel safer, wire a light switch in series with the compressor starter coil and place the switch next to your other light switches. Label it compressor.
And again, a plant setting makes no difference as far as disconnects go. If the machine was within 50' of and in sight of the panel, then its not required by code.
If u think there is more to the PS why dont u take some pics and post them. At this point its all guessing over the internet for us.
Ya know what they say. "A picture is worth a thousand words." Probably more so.
Leviton makes a 60 amp switch. A believe it is ms602 for single phase and ms603 for 3 phase. These is part of a series of motor rated switches. They have really nice special switch boxes to mount these specialty switches in although a had the 602 mounted in a 4.5" steel junction box with a cover. From the exterior it looked like a simple toggle switch. Hope this helps.
Those are more geared towards motors without starters. The OP doesnt need to waste money on that for many reasons including breaker panel is within 40' and most likely in sight of the compressor, an AC pull out disconnect is cheaper if the OP insists on having a disconnect for servicing the compressor, and as has been said numerous times a cheap snap switch and some wire will accomplish what he is looking for which is an "On-off switch".
People in this thread are confusing "on-off" switch with disconnect. The Op asked about an "on-off" switch. An on-off switch is just that. A disconnect is for servicing and removes power from the machine which isnt necessary since breaker panel is within 50'.
