Question about Connecticut Electric 40 Amp 2 Pole Circuit Breaker

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I want to put a on and off switch just like a light switch in the wiring for my compressor. It has a 40 amp breaker and is a 220 volt compressor. I have a 30 amp, 600 volt switch and I need to know if this is correct or do I need to use a 40 amp switch. Thanks

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  • 6456trucks Feb 26, 2009

    Well I looked on my compressor and all it says is 208-230 volt, 1 phase. I do know that it has a 40 amp double pole breaker and all I want to do is put a switch in so I don't have to keep unplugging my compressor just in case a line blows or something that would allow it to run all the time. Thanks

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On the compressor or in the manual it should say the Full Load Current or Full Line Current (FLC). I would go by that to size your switch.

They make motor rated toggle switches which look the same as a light switch. You would need a *blank* amp motor rated 2 pole toggle switch it should have 2 screws on each side excluding the ground. The left side screws should have one circuit on them and the right side should have the other circuit on them. Mount this in a metal box with a "RS switch cover" for inside installs or a "Bell" or ferrous box for outside with a weatherproof switch cover. Make sure you buy a big enough box to fit the switch and room to bend the wires. Also are you planning on just cutting a cord and running to the switch or hard wiring? Make sure to get appropriate connectors and if it is exposed to possible damage consider using flexible mettalic conduit.

FYI in most cases a switch can not be oversized it can be undersized however.

Feel free to write back if this is unclear.

Posted on Mar 31, 2009

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NO U SHOULD NOT USE THE 30 AMP. SW, THE SW SHOULD BE THE SAME SIZE AS THE PROTECTION AT THE PNL! AND THEY SHOULD BOTH BE THE SIZE THAT IS STATED ON THE NAME PLATE ON YOUR COMPRESSOR, U CAN USE A 220 VOLT SINGLE PHASE NONE FUSED 60 AMP INDOOR OR OUTDOOR TYPE DISCONNECT FOUND AT ANY ELECTRICAL SUPPLY HOUSE, AROUND $20-30 IF I HAVENT BEEN UNDER AROCK FOR LONG! THIS BY THE WAY IS NOT TO BE MOVABLE, SWITCH NEEDS TO BE MOUNTED TO SOMETHING LIKE A WALL OR COLUMN. GOOD LUCK AND BE CAREFUL WITH THE JUICE!

Posted on Feb 26, 2009

  • im4wideop277 Feb 26, 2009

    NO U SHOULD NOT USE THE 30 AMP. SW, THE SW SHOULD BE THE SAME SIZE AS THE PROTECTION AT THE PNL! AND THEY SHOULD BOTH BE THE SIZE THAT IS STATED ON THE NAME PLATE ON YOUR COMPRESSOR, U CAN USE A 220 VOLT SINGLE PHASE NONE FUSED 60 AMP INDOOR OR OUTDOOR TYPE DISCONNECT FOUND AT ANY ELECTRICAL SUPPLY HOUSE, AROUND $20-30 IF I HAVENT BEEN UNDER AROCK FOR LONG! THIS BY THE WAY IS NOT TO BE MOVABLE, SWITCH NEEDS TO BE MOUNTED TO SOMETHING LIKE A WALL OR COLUMN. GOOD LUCK AND BE CAREFUL WITH THE JUICE!

  • im4wideop277 Feb 26, 2009

    NO U SHOULD NOT USE THE 30 AMP. SW, THE SW SHOULD BE THE SAME SIZE AS THE PROTECTION AT THE PNL! AND THEY SHOULD BOTH BE THE SIZE THAT IS STATED ON THE NAME PLATE ON YOUR COMPRESSOR, U CAN USE A 220 VOLT SINGLE PHASE NONE FUSED 60 AMP INDOOR OR OUTDOOR TYPE DISCONNECT FOUND AT ANY ELECTRICAL SUPPLY HOUSE, AROUND $20-30 IF I HAVENT BEEN UNDER AROCK FOR LONG! THIS BY THE WAY IS NOT TO BE MOVABLE, SWITCH NEEDS TO BE MOUNTED TO SOMETHING LIKE A WALL OR COLUMN. GOOD LUCK AND BE CAREFUL WITH THE JUICE!

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1 Answer

How to wire a 220 volt switch


Turn off the main breaker controlling the power to the home. This will ensure that the wires at the 220-volt switch are not powered before working on them
Remove the cover from the old 220-volt switch with your straight screwdriver. Also, remove the screws that are holding the switch into the box. Pull the switch and wires out of the box so that the connections are accessible.
Identify the two sets of wires in the switch box, a red and a black pair, in the same conduit or insulated sheath. You should be able to see which wires are going to the device, or load. The line side is the other set of wires coming from the breaker.
Loosen the screws that hold the wires onto the switch. Pull all of the wires off of the old switch. Inspect the new 220-volt switch and identify the connection screws marked line and load.
Strip 3/4-inch of insulation from the ends of all four wires if they aren't already. Curl the tips of the stripped wires. Wrap the curled ends clockwise around the screws so that tightening the screw makes the wires wrap tighter.
Connect the black and red hot wires, or line, to the side of the switch marked "Line," usually the darker set of screws. Connect the two wires that are going to the device, or load, to the two screws marked as "Load" on the switch, usually the lighter colored screws on the switch.
Connect the bare ground wire, if there is one, to the green grounding screw on the switch. Push the wires and switch into the electrical box. Install the two screws that hold the switch into the box. Replace the switch cover and turn the main breaker back on.

Read more : http://www.ehow.com/how_8270481_hook-up-220volt-switch.html

Dec 13, 2014 | Electrical Supplies

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I have a problem getting the timer to supply 220 Volt?. I get 110Volt. I have a 30Amp breaker and a double pole breaker and 310 wire. Where am I going wrong. Should the white wire from the plug go to...


Your wiring is incorrect -or- wire is not under the screw plate correctly -or- the 240Volt breaker is tripped on one leg.
Make sure that copper wire is under screw plate, and that no insulation is under plate keeping wire from making contact.
Open following link to double-check wiring:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

Jan 09, 2012 | Intermatic T104 24h 208-277v Mechanical...

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I'm confused about how to properly hook the wiring to the product below. Specifically where does the "neutral" wire attach. I have it all hooked up, but I'm not getting the full 220...


Your 240V wiring is not described clearly, and it sounds like you are confused about 240Volt circuits.
You posted under T104R indoor-outdoor 240volt timer:
http://waterheatertimer.org/images/T-104-control-240V-Load4-35.jpg

Typically a 240Volt cable is 2-wire with ground, and does not have a 'neutral'
A neutral is not necessary to complete 240V circuit.
If your 240Volt cable is a 3-wire with ground, then the neutral connects to terminal A on timer.
Open following links for specific T104 wiring diagrams plus illustration of 2-wire and 3-wire cables, and illustrations and explanation of difference between 120V and 240V circuits:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/images/wire-ga-250.jpg
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If you have 240Volt cable, then do not move clock motor wires.
The clock motor wires connect to terminals 1 and 3.
240V power from circuit breaker connects to same terminals.
Load wires connect to terminals 2 and 4.

If you are not getting 240V across terminals 1 and 3, then check circuit breaker.
240Volt circuit breaker can be tripped off on one leg, or bad on one side so you get 120V on one leg at timer, and then clock motor does not rotate dial.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

Jul 03, 2011 | Intermatic T104R 208-277Volt 40-amp Timer...

1 Answer

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Two hot wires from the panel go to "line" and two wires from motor go to "load". See the diagram on the inside of the door. You should consider running the "load" to a 220 wall switch and then to the motor so you can turn it off quickly if necessary without fooling with the timer.

May 30, 2011 | Intermatic T104R 208-277Volt 40-amp Timer...

1 Answer

I have a T104P,it is hard wired to hayward I hp pump,the breaker in panel is 2 together which i believe = 240...I am putting a dolphin 115 amp with a plug. i want to run the intermatic to a outdoor...


So you want to wire a 115 volt outlet to T104 240volt timer?
Open following link to see how to wire outlet so it turns on-off with timer.
If you do not want outlet to turn on-off with timer, connect 120Volt hot to terminal 1 instead of terminal2
http://waterheatertimer.org/images/Main-breaker-box-1-500.jpg

Open following link for general wiring information:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/See-inside-main-breaker-box.html
http://waterheatertimer.org/How-to-replace-circuit-breaker.html

What concerns me is the 8 gauge wire.
If the timer has 8 gauge wire, it is not code to connect smaller wire to outlet without putting 15 amp in-line fuse on 120Volt hot.
http://www.grainger.com/Grainger/COOPER-BUSSMANN-Fuse-Holder-1CV90?Pid=search

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

I have a cutler hammer switch box that takes care


Is the motor new or old? Is this a recent problem or has it always been that way? What is the motor used for? Does the motor start and stop a lot, or does it run continuous? Is it constantly under load? Is this residential or commercial use? Approx.how long is the circuit? What size wire and breaker are being used? Does it kick out when it starts or while it's running?
The FLA (Full Load Amps) for that motor is 22 x 1.25 = 28 amps. In GENERAL, a motor like that usually requires a minimum #10 (THHN or THWN) wire on a 30 amp breaker. However, NEC does permit up to a 70 amp breaker (250% of the FLA) if the 30 amp breaker is not sufficient for starting.
Remember that it's the built-in motor overloads that protect the wire. Best practice is to use the lowest size breaker possible for ground fault protection that will still allow the motor to start. A 40 amp breaker would be permissible.
On the other hand, if the circuit is very long, you need to increase the wire size to #8 or larger.
If this is an old motor that didn't have this problem before with your current setup, then you may need a new motor, and increasing the breaker size is not usually the solution, at least not without a qualified electrician actually seeing and evaluating the situation first.



Dec 16, 2009 | Cutler Hammer Electrical Supplies

2 Answers

What size amp switch do I need.


NO! Use a switch rated higher in amps and equal to or higher in voltage relative to the breaker rating. Use a 40 or 60 amp switch rated a minimum 220 volts.

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