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Old 09-21-2008, 03:06 PM   #16
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wire sizing for wall heater?


I did not mention it because the amperage was so low.

Anyways would it not be 6.25X125% not 6.25+125%. Which would give you 7.8A. I live in Canada and only know the Canadian Electric Code which treats the load differnetly then other loads but this could be rule of the NEC.
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Old 09-21-2008, 03:09 PM   #17
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Anyways would it not be 6.25X125% not 6.25+125%.

Try it either way and see what you end up with.
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Old 09-21-2008, 03:50 PM   #18
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Try it either way and see what you end up with.
You end up with two different numbers. 7.81 and 14.06
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Old 09-21-2008, 03:58 PM   #19
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You end up with two different numbers. 7.81 and 14.06

I couldn't come up with 14.06, what am I doing wrong?
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Old 09-21-2008, 04:04 PM   #20
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Chris they took 6.5x125% and then added that number to 6.5 to get you the 14A.

If you add or multiply you get the same answer, i just have never seen it written or said as adding 125%.

We both meant the same thing but written two different ways.
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Old 09-21-2008, 04:08 PM   #21
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I couldn't come up with 14.06, what am I doing wrong?
125% of a number is the number plus 25%. When you say take the number and add 125% you're actually saying take x and add it to x*1.25. It should be take the number and add 25%.

Last edited by jerryh3; 09-21-2008 at 04:11 PM.
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Old 09-21-2008, 05:04 PM   #22
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125% of a number is the number plus 25%. When you say take the number and add 125% you're actually saying take x and add it to x*1.25. It should be take the number and add 25%.
I know, I was not sure how you guys were coming up with 14 amps, most people, I thought would just multiply by 1.25, guess I thought wrong.
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Old 09-21-2008, 09:59 PM   #23
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... I thought would just multiply by 1.25, guess I thought wrong.
Nope, you thought right.

You can EITHER take the full load and multiply by 1.25 OR you can take 125% of the full load. Both are the same thing.

You do NOT take the full load and add another 125% to that. Overkill, big time.

I get 7.8 Amps total needed for this circuit. Slightly over half of what a 15 Amp circuit can safely provide.
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