Question about Siemens /ite Bq Circuit Breaker Bq3b090 3p 90amp

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

Posted by on

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

Posted on Oct 14, 2010

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Posted on Jan 02, 2017

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## Related Questions:

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If you're connected to a 240V source, a two-pole 40 amp circuit is required. If connected to a 208V source, a two pole 30 amp circuit is required.

But the limiting factor here will be the wire size. If installed with #10 copper wire, 30 amp will be maximum. If a #8 copper (or #6 aluminum) 40 amp is maximum. See the link below for details.

http://www.whirlpool.com/digitalassets/GBS307PRB/Dimension%20Guide_EN.pdf

Sep 24, 2015 | Ovens

### My trolling motor burn out circuit breaker if it runs for about 30 minutes

Have you measured the current? Is it in spec? Is the motor stiff or seizing and taking excessive current, is the wiring to the circuit breaker adequate?

Jul 28, 2014 | Electrical Supplies

### Can 40mp dryer and 40 mp range be computable

But - Umm.. huh?

By "40mp" Do you mean 40 amp? They are both "computable" but I suspect that you meant compatible. If so, yes, 40 amps is 40 amps regardless of what it supplys, as long as the wire is the right type and size. I haven't seen a 40 amp residential dryer though. Residential electric ranges and electric dryers are both 240 volts - but the dryer is usually a 30 amp circuit (#10 copper) and protected by a double pole 30 amp circuit breaker. The range is a 40 amp circuit (#6 aluminum) and protected by a double pole 40 amp circuit breaker.

Feb 07, 2013 | Connecticut Electric Electrical Supplies

### 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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This looks like an indoor panel. If you have an outdoor panel next to (or below) the power companies meter, It should have the breaker to feed such a panel. Thus, this indoor panel should only be required to have "main lugs" to receive wire from outside breaker. NEVER size breaker outside bigger than the equipment rating of inside devices. If from the power companies meter you intend to feed this panel, YES it is required to have a Main Breaker.

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### How to convert the aircondition tanage in amp

I assume you mean tonnage. If you are looking for the amp amount to run a circuit to your aircond. here is rule of thumb: 2 ton is a 20 amp circuit (requires two 20 a breakers for a 230volt single phase unit)
3 ton is a 30 amp circuit (230v 1 phase)
4 ton is a 40 amp circuit (230v 1 phase)
5 ton is a 50 amp circuit (230v 1 phase)

all these require two breakers, and both breakers should be joined together.

May 11, 2011 | Heating & Cooling

### What size breaker and wire for this oven

Hello Sbilko,

I understand that you are tring to find a breaker and wire size for your GE JKP28 Double Oven. As I look up the specs on your oven I find that both ovens are rated at 30 amps. This requires you to use two thirty amp breakers one for each oven. The industry standard for Oklahoma requires that you use at least #10/2 wire for a 30 amp breaker. However, in some places it states that you can use #12/2 although I would not recommend using #12 gauge wire.

My suggestion to you is two 30 amp breakers and #10/2 gauge wire, this should be what will take care of the circuits and keep the wire form heating up.

Thank you for choosing FixYa.com

Justin

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### Correct wire gauge and circuit breaker to use?

If it is only the oven that is electric and not the entire stove, the required wire size is 10/3 with ground and a 30AMP circuit breaker. If it is the entire stove then you need 50AMP range cable and a 50AMP breaker. If your doing your microwave also, you need a 20AMP breaker and the wire you need is 12/2 with ground.. If the current breaker you were running was 30AMP I would keep that for your oven and run new wire for your microwave.

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### 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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