Question about Connecticut Electric 40 Amp 2 Pole Circuit Breaker

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What size amp switch do I need.

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 Mar 03, 2009

    thanks for the information is was very helpful.

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First of all, i am not sure if you are knowledgable on electric circuits....your breaker panel is probably a single phase which is nominal so your compressor being a 40 amp 220 volt unit needs a dual breaker at 40 amps meaning that both the black and white wires go to the breaker......then if you want to also add another on-off switch in line with it to control it from another location, you can use a single pole, single throw switch rated for at least 220 volt with contacts that can handle at least 40 amps or higher.....you would connect such a switch by cutting either the black wire and connect both ends of the cut black wire to the 2 contacts of the switch or you can also do the same with the white wire......by using a single pole switch though, one side of the line will always be live even though you shut off the power......you can use a double pole, single throw switch to connect both the white and black wires to, which will completely cut off the power when switched off....if all of this is too much to understand, then just use your existing 40 amp breaker in the panel as your on and off switch........good luck....be careful as 40 amps and 220 volt is extremely LETHAL........good luck

Posted on Jun 28, 2010

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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.

Posted on Feb 28, 2009

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aguywithfeet
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SOURCE: I want to put a on and off switch just like a

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

6ya6ya
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1 Answer

What size wire and how does it hook to thr unit rpkb-036jaz


Look at rating plate on side of unit for Volts, Amps, Watts.
Volts x amps = watts.
If unit is 240Volts, then you need double-pole 240Volt breaker
If unit is 8500 watts at max power, then 8500 watts divided by 240Volts = 35 amps.

What size breaker for 35 amps?
When electricians figure load rating for breakers, they use the 80% rule.
40 amp breaker x 80% = 32 amp safe maximum load for 40 amp breaker. Use 8 gauge wire with 40 amp breaker.
50 amp breaker x 80% = 40 amp safe maximum for 50 amp breaker. I use 6 gauge wire with 50 amp breaker.
60 amp breaker x 80% = 48 amp safe maximum for 60 amp breaker. Again, use 6 gauge wire with 60 amp breaker.

How to connect wires to unit.
First of all, all outdoor HVAC units require power cut off located next to unit.
This lets the mechanic, or service tech turn power off to work on unit, even if the mechanic does not have access to main breaker box.

Next, open unit to see where wires connect.
If unit has wires, then connect both hot wires from 240 breaker to the wires inside unit. Connect bare ground wire to green ground screw.
If unit has terminals. The terminals will be labeled L1 L2. Connect each hot wire from 240Volt breaker to either one of the screw terminals. Then bare ground goes to green ground screw.

Copy following links for basic illustrations connecting wires to terminals, and to breakers, and selecting wire size.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

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I would use a # 10 wire size with a 30 amp breaker. The motor should already wired to the pressure switch unless it has a mag starter. If no mag starter incoming power should go to pressure switch not motor. If unit has a mag starter incoming power should go to top of mag starter.

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I have a new ingersol rand 80 gal 7.5hp air compressor 230volt single phase and was wondering what size breaker it needs to be put on


Your owners manual spec sheet should give you that answer. However since that unit at max loads should pull 32 to 35 amps I recommend 1.5 times max amps. So approximately a 50 amp breaker. This all based on standard wire size and length of wire run. Also when checking your voltage at load you should be showing 235 to 240 volts.

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When specs say circuit requirement is 40, do they mean the breaker size?


What are you wiring?
Does it seem realistic that you need 40 Amp capacity?

40 Amp circuit breaker is usually 240 Volt and it goes to heat pump, double oven, or some heavy equipment. 40 amp breaker uses 8 gauge wire.

You can figure a circuit with the formula V x A = Watt
If your VA is 7500 Watts and voltage is 240, then Amps is 31.25

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3 Answers

Switch on and trips breaker.


Must be your breaker amp must be below requirement. Do not use an extension cable, make it short as possible to the source. It would also be better if you have a separate breaker switch just for your compressor in the panel box.

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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.



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1 Answer

I have a 2hp compressor motor that keeps tripping the breaker after about 5 minutes of use. i have changed the caps but it keeps popping the starter cap. is the motor just bad?


Our 2 HP Speedaire horizontal tank compressor is rated 115 / 230 volts at 24 / 12 amps, respectively. This means at 115 volts, a 30 amp circuit breaker is the bare minimum. That also means that the wiring should be #10 copper wires for short runs, but the next size up; #8 copper wires would be better connected to a 40 amp circuit breaker. Running at 230 drops the amperage requirement by half, to 12. A #14 copper wire is minimum for short runs with a double pole 15 amp circuit breaker, but #12 copper wires connected to a double pole 20 amp circuit breaker would be better choice.

If the compressor is cord connected (or even directly wired) with the minimum sized wires, it will likely a voltage drop problem unless very close to the panel. This problem is more pronounced as the distance between the circuit breaker and motor increases, or when smaller wires are in the circuit. All the voltage at the circuit breaker does not reach the motor, as it is lost as heat; so the compressor only sees 90 to 105 volts instead of the 115 volts it expects.

If the cords, connections, etc are getting hot, it is a tell tale sign of under-sized wires and /or poor connections. Once you solve these problems, the compressor should run "as advertised " because motors usually don't "go bad" but fail all at once. Unless you have a bearing problem - or there is a problem with the load itself (compressor).

I hope this helped.

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2 Answers

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...


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!

Feb 26, 2009 | Connecticut Electric 40 Amp 2 Pole Circuit...

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