Unfused Disconnect Switch

[mstrlucky74]

Showing only a symbol and it says 120v. No amperage( I have no panel schedule or equipment schedule). So I guess it could be either a 250v or 600v disconnect!!?? Trying to narrow it down so I can qualify accordingly what I have figured. I don't think I ever seen a disconnect switch fed from a 1P-20A circuit. Thanks.

 

[Daniel malack]

Showing only a symbol and it says 120v. No amperage( I have no panel schedule or equipment schedule). So I guess it could be either a 250v or 600v disconnect!!?? Trying to narrow it down so I can qualify accordingly what I have figured. I don't think I ever seen a disconnect switch fed from a 1P-20A circuit. Thanks.

What is it feeding

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[mstrlucky74]

What is it feeding

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Says 120v fan filter unit.

 

[Daniel malack]

Says 120v fan filter unit.

Can you follow the wire to the unit? The disconnect should be in sight of the equipment.

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[mstrlucky74]

Can you follow the wire to the unit? The disconnect should be in sight of the equipment.

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It is within sight. it actually does say circuit 41. so I'm going to assume a 1P 20A CB feeding it. But I would need a 30A disconnect, correct?

 

[mopowr steve]

Maybe all you need is a 20 amp rated single pole switch.

 

[Daniel malack]

It is within sight. it actually does say circuit 41. so I'm going to assume a 1P 20A CB feeding it. But I would need a 30A disconnect, correct?

What does the equipment require?

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[Daniel malack]

What does the equipment require?

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Look on the name plate of the equipment.

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[mstrlucky74]

Look on the name plate of the equipment.

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Again, don't have any equipment info.

 

[Daniel malack]

Again, don't have any equipment info.

Get an amp meter and get reading as it starts and then runs. That will tell you where to go from there.

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[Jraef]

I would just use a toggle switch type Manual Motor Starter, in fact I would get one that uses a heater element since you know nothing about the equipment yet. If you end up not needing the heater element, just install one that's bigger than necessary. If you do need it, you don't have to buy a different switch.

 

[infinity]

Get an amp meter and get reading as it starts and then runs. That will tell you where to go from there.

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The OP said that he's reading this info on a print, you're assuming that it's already in place.

 

[Daniel malack]

The OP said that he's reading this info on a print, you're assuming that it's already in place.

That does make a difference! Panel schedule on ckt 41 on risor diagram is? 120 volt 20 amp? Use a 20 amp single pole switch. Correct?

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[hbiss]

Get an amp meter and get reading as it starts and then runs. That will tell you where to go from there.

mstrlucky74 is an estimator.

-Hal

 

[Joe Villani]

Check the H drawings, and the notes.

You might not be responsible for the disconnect, but may have to add labor for mounting and figure on your normal terminations, etc.

 

[mstrlucky74]

Got it....I'm qualifying it a 30A disconnect with 4#10's.

 

[just the cowboy]

Why 4 #10

Why 4 #10

If you go with 10s ok but why 4 for a single phase circuit? One hot off of circuit breaker 41, one neutral and one ground.

 

[mstrlucky74]

If you go with 10s ok but why 4 for a single phase circuit? One hot off of circuit breaker 41, one neutral and one ground.

True, was thinking 3 phase.