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Old 09-05-2012, 12:15 AM   #1
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Default Range calculation: N.E.C 220.55??

I'm studying to get my license and need help with one of my test questions/answers
.
One cooktop and two ovens are connected to one branch circuit in a kitchen of a one family dwelling. The cooktop has a nameplate rating of 4kw at 240v, while each oven has a nameplate rating of 5.5kw at 240v. The minimum load calculation for this branch circuit is ______ watts.
image-834953987.jpg
I don't understand how they made this equation.
I appreciate the help.
Chas3x

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Old 09-05-2012, 01:29 AM   #2
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Quote:
Originally Posted by Chas3x View Post
I'm studying to get my license and need help with one of my test questions/answers
.
One cooktop and two ovens are connected to one branch circuit in a kitchen of a one family dwelling. The cooktop has a nameplate rating of 4kw at 240v, while each oven has a nameplate rating of 5.5kw at 240v. The minimum load calculation for this branch circuit is ______ watts.
Attachment 16469
I don't understand how they made this equation.
I appreciate the help.
Chas3x

Look at note 4 of Table 220.55. That is for branch circuit load.

Edit: I just saw the answer sheet said to reference note 4. Do you understand how to use the table, and how to apply note 4?


Last edited by A Little Short; 09-05-2012 at 01:31 AM.
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Old 09-05-2012, 02:48 AM   #3
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Haven't done one of these in awhile...

3 appliances become (1) appliance.

Column C (1) appliance is 8,000 watts.

4kw + 5.5kw + 5.5 kw is 15kw.

15kw-8kw = 7kw

Add 5% for each additional kw over 8kw.

8kw x 35% = 10,800 watts

10.8 kw/ 240 = 45 amps.

That's off the top of my ahead I could be wrong.
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Old 09-05-2012, 07:31 AM   #4
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When is it legal to run a full size range on #10s ? My last full time gig pulling wires at a Marriot residence inn had me doing that.
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Old 09-05-2012, 09:36 AM   #5
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Originally Posted by Magnettica View Post
Haven't done one of these in awhile...

3 appliances become (1) appliance.

Column C (1) appliance is 8,000 watts.

4kw + 5.5kw + 5.5 kw is 15kw.

15kw-8kw = 7kw

Add 5% for each additional kw over 8kw.

8kw x 35% = 10,800 watts

10.8 kw/ 240 = 45 amps.

That's off the top of my ahead I could be wrong.
Wrong!
15kw-12kw= 3k
5% for each kw over 12kw
5% x 3kw=15%
8kw x 15%=1.2kw or 1200 w
8kw + 1.2kw = 9.2kw
or as the test wanted =9200W
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Old 09-05-2012, 03:13 PM   #6
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So you reduce the 15kw by the highest kw (12) in column C?
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Old 09-05-2012, 03:21 PM   #7
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I just figured it out! I appreciate your help.
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Old 09-05-2012, 08:24 PM   #8
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Quote:
Originally Posted by Little-Lectric View Post
Wrong!
15kw-12kw= 3k
5% for each kw over 12kw
5% x 3kw=15%
8kw x 15%=1.2kw or 1200 w
8kw + 1.2kw = 9.2kw
or as the test wanted =9200W
It's been awhile. I knew this like the back of my hand for the exam, but now not so much. I would have to check my Tom Henry books if I ever ran into this in the real world.

Thank you for correcting me.
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Old 09-05-2012, 08:28 PM   #9
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I don't like to make excuses for anything, but it was late and I had woken up from sleeping. I see now where I went wrong.

Quote:
Notes:
1. Over 12 kW through 27 kW ranges all of same rating. For ranges individually rated more than 12 kW but not more than 27 kW, the maximum demand in Column C shall be increased 5 percent for each additional kilowatt of rating or major fraction thereof by which the rating of individual ranges exceeds 12 kW.
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Old 09-06-2012, 12:10 AM   #10
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Quote:
Originally Posted by Magnettica View Post
It's been awhile. I knew this like the back of my hand for the exam, but now not so much. I would have to check my Tom Henry books if I ever ran into this in the real world.

Thank you for correcting me.
No problem, it was fun! I'm usually the one getting corrected!
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Old 09-06-2012, 01:49 AM   #11
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Quote:
Originally Posted by Little-Lectric View Post
Wrong!
15kw-12kw= 3k
5% for each kw over 12kw
5% x 3kw=15%
8kw x 15%=1.2kw or 1200 w
8kw + 1.2kw = 9.2kw
or as the test wanted =9200W
Thanks for the info.
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Old 09-07-2012, 09:42 AM   #12
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[quote=Little-Lectric;801021
15kw-12kw= 3k
5% for each kw over 12kw
5% x 3kw=15%
8kw x 15%=1.2kw or 1200 w
8kw + 1.2kw = 9.2kw
or as the test wanted =9200W[/quote]


haha thats the way i learned it !!!!

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