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Electrical Power Input Rating

03/28/2011 8:02 AM

In Canada, for high power appliances, 2-Phase power input is used. What is the Line to Line Voltage RMS value? For the stove connected Line to Line, there is a 40 Ampere Circuit Breaker, what is the maximum Power rating of the stove that can be used?

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Guru
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#1

Re: Electrical Power Input Rating

03/28/2011 8:20 AM

Twice the line-to-neutral voltage, multiplied by the circuit breaker rating in amperes gives the maximum power that can be drawn from this supply in watts to run the stove.

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Guru
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#2

Re: Electrical Power Input Rating

03/28/2011 8:33 AM

In Canada as in U.S. residential power, it is (almost invariably) single phase, with 240v line-to-line and 120v to center-tapped line-to-neutral. 240 x 40 = 9600 watts.

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Guru
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#3
In reply to #2

Re: Electrical Power Input Rating

03/28/2011 9:45 AM

You can only load a circuit to 80% of it's rating. So if your conductors are sized to be protected by a 40A CB, they are only rated to carry 32A x 240V = 7680W maximum (resistive).

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#4
In reply to #3

Re: Electrical Power Input Rating

03/28/2011 12:16 PM

Thanks for the tip to use only 80% of installed capacity.

I am looking for a new stove with 4 heating elements. If the total rating is say 9600W (all 4 heating elements togather); can I install this stove with rated capacity of 9600 W considering the fact that all 4 heating elements are never going to be used at the same time?

Thanks.

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Guru
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#5
In reply to #4

Re: Electrical Power Input Rating

03/28/2011 3:10 PM

"... considering the fact that all 4 heating elements are never going to be used at the same time?"

That is an assumption on your part and plays no part in the appropriateness of the installation. Most Range / Oven circuits in the US and Canada are 50A.

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Commentator

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#7
In reply to #5

Re: Electrical Power Input Rating

03/29/2011 8:22 AM

You are mistaken,

The stove receptacle is rated for 50A but for 90% fo stoves, the breaker is a 40A 2-Pole.

I have only seen one "luxury" range which required a 60A 2-Pole Breaker.

So if you want to install a stove in your house.

1) 2-POLE 40A BREAKER

2) 8/3 NMSC (40A capacity)

3) 4 11/16" X 4 11/16" Electrical Box

4)14-50R Receptacle (50A 120/240V 4-wire)

And a how to book! Happy hunting

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Guru
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#6
In reply to #4

Re: Electrical Power Input Rating

03/28/2011 10:48 PM

If you are buying a new stove ther will be an Energy Guide sticker on front somewhere. You will find that often the 4 burner stove has two hi wattage and two lower wattage elements. Mine are 1100 watts and 700 watts The oven usually has an upper and lower 2000 watt element. The top elements are arranged so two of them are wired 120v from line 1 to neutral and the other line 2 to neutral. the stove elements are wired across L1 -L2 for 240 V operation. I have found many house stoves have a combined rating around 7600 watts total consumption.

My stove is wired with a 4 conductor #6 Ga wire and a 40 amp double pole breaker.

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