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What wire size and breaker are required for 5.5 HP 240 v motor

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Look on the motor face plate for its F/L/C/full load current rating,and go by this,otherwise to be safe use 2 # 10 AWG for the 240 lines L1 and L2 and a #12 AWG for the Neutral line and a 30 Amp double pole circuit breaker

Posted on May 09, 2010

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1 Answer

Try to hook up my welding to breaker panel how many breaker do I need and what size


Typically a welder is 240v requiring a Double pole breaker, the size would depend on the equipment amps or watts?
30 amps X 240 volts = 7200 Watts

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I have a 5 hp compressor. It will turn on and run maybe 5 seconds and then kicks my breaker out.


you could have a weak breaker or the breaker is not rated for the draw of the compressor have a pro check it out

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I have a new furnace and the breaker keeps tripping (20/30). It is a bryant westinghouse box. I think 200 amphes


1) You got a FIRE truck coming.

2) Wire is too small.
Problem is NOT circuit breaker.

3) Both 240Volt appliances on same breaker is a hazard, especially if space available in 200 amp service panel for more breakers.

4) Usually each 240V appliance has separate breaker.

5) Circuit breaker trips because of High heat on the wire.
If wire gets hot, it will start a fire inside the wall.

Electric code requires wire-size match breaker-size.

6) If you put larger amp breaker on same wire that is getting hot, then wire will get hotter.
Result: FIRE truck middle of night with folks jumping out window in glass-cut bare run across yard.

7) Each appliance has volts and watt rating on label.
EVERY appliance has label.

8) For example stove might be rated 8000 watts and 240Volt.
8000 watts divided by 240 volts = 33.3 amps
Stove would require 40 amp breaker and 8 gauge wire.

9) How to figure it out:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-install-a-subpanel.html

10) Do same calculation for new furnace.
12000 watt furnace divided by 240 volts = 50 amps.
Use 60 amp breaker and 6 gauge wire.

11) Summary: fixya wants you to be safe, and buy stuff showing in the ads.
Use a bigger breaker ONLY when bigger wire is also installed.
Call furnace installer, the installer should know to check safe wiring before installing.

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1 Answer

How dou you connect the electical wires I connected them and it throws the breaker


Look at rating plate on motor.
Look for volts, watts, amps.
Figure with Volts x Amps = Watts.
Amps = Watts divided by Volts
1 hp horsepower is 756 Watts.

Lets say you have 120Volt 2hp motor
So 2 horsepower motor draws 1500 Watts
Amps = 1500 Watts divided by 120Volts = 12.5 amps = so you need 120Volt 15 amp breaker with at least 14gauge wire (as long as motor is located within 50 feet of breaker.)
If motor is farther away, then you need 20 amp breaker with 12gauge wire.

Look at circuit breaker rating.
If motor is 240 and breaker is 120, then it will trip breaker.
If motor is 120 and breaker is 240, then it will trip breaker.
If breaker is for 15 amps and motor draws 20 amps then it will trip breaker.

Generally speaking, if motor and breaker are 120V, then black wire goes to black wire; white wire goes to white wire and green wire connects to bare copper wire.
If motor and breaker are 240V, then wire colors can be different. Black-red or Black-white from breaker connect to Black-red or Black-white at motor.

Add a comment. Say the motor rating and color of motor wires. Say the breaker size and color of wires coming from breaker and I will help you wire the device.

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1 Answer

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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How to wire a vulcan for 240 installation


find power box. see if you have 2 spare breakers avail. next determine power requirement for appliance example 20 amp./ 30 amp breaker a 30 amp load will require a larger wire size example # 10 wire always consult owners man. or manf.instructions reg. if 208/240 is ok should say in owners manual always follow local/ nat electrical codes.

Jan 14, 2010 | Kitchen Appliances - Others

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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Wiring installation for ss5l5 IR 5hp 60 gallon compressor


A #10AWG wire can be use and 40Amp breaker can be use also. Your 5hp/230V/1/60hz motor amp is 30A.

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1 Answer

What size breaker do i use?


at 10kw, that should be about 34130 btu's. With 240 volts, you should be using approximately 41-42 amps. Check the manufacturers name plate for breaker sizing. probably a 45-50 amp double pole breaker will work, also check with a licensed electrician to make sure that the wire is sized correctly for that unit. Hope this helps.

May 01, 2009 | Fahrenheat Electric Convector Baseboard...

1 Answer

Installing new base boards


Convert the watts to amps or get the amp rating off the device, this will tell you the minimal wire size, and then you will need to measure the distance from the breaker to the device, that will determine if the wire size needs to be increased for a long distance.

Example the 1500 uses 20 amps and 20 amps requires #12. 20 amps on a #12 is good for 100 feet anything further and you have to go up a wire size.

Take the amp rating and distance to the hardware store and they will have the chart and the correct wire for you to use. In the US 220 or 240 used to be three wire, 2 hots and a neutral through a double pole breaker, now the new NEC rules demand 4 wires for 220 volt devices, so you will need to check with whatever local code authority as to what they want on new installs versus replacement, if you are grandfathered in some way.

As to the four wires above, from the box, is that the heater box or circuit breaker box? In either case, the two hots go through their own breaker, called a double pole breaker, at the correct amperage rating. the white which is neutral and yes ground, is tied to the neutral bar in the breaker box, the bare or green, goes from the frame of the heater or the chassis, some common metal part, probably a green screw in the heater, and then in the breaker box, it will wire in with the rest of the bare grounds, this is a four wire 220 connection where they have quit using the white neutral as the only ground, and have insisted on adding this fourth bare chassis ground.

Once you have the correct wire size for the amperage, and the correct breaker size, and the wire size does not exceed the max limits for the size, you should be good to go.

However if you are concerned you can pull this off, pay a pro to do it, it is not worth a fire on a heater wiring job, for a few bucks on the install, it happens to often and not worth it, I have written on hear now several times, and have no responses, I have over thirty years in electrical devices including NEXRAD RADAR, motors above 5000 HP and understand all this, and the dangers.

Again wbwill@sbcglobal.net, or allexperts.com

I am not sure about fees, if there are any they go through this system in all fairness.

Will

Apr 28, 2008 | Fahrenheat Electric Convector Baseboard...

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