Hello,
I am doing a little rewiring on a house and the owner has found a very old double oven/range with burners on the top that he wants to reuse.
The nameplate on the appliance says
115/230
120/240
KW=20.9
I have been trying to size this old monster and have come up with a few calcs.
I can use table 220.19A for a single oven, However it appears that it is over 12KW so I need to use the nameplate rating.
My KW is 20.9 so
20.9 x 1000 = 20900
20,900 /240 volts = 87 amps
If I go to branch ckt rating, 210.19A3, it tells me that the conductor for househod ranges shall have an ampacity not less than the rating of the branch ckt and not less then the max load to be served.
If I go to 422 for appliances, it tells me to use 220.19 and nothing about using 125% for my loading.
My first question. Am I not reading the table correctly for 220.19. If I am over 12 KW for one range, do I not use column C or can I use note 1 and still use the C column.
If I can use note 1, I come up with this for my range.
5% for each KW over 12.
so, 21 KW is 9 Kw over 12
so 5% for each Kw over 12 is = 45%
so max demand one range column C is 8 Kw
8 KW x 45% = 11.6 KW
11.6 KW /240 = 48.3 amps
It looks like I can run this with #6 and fuse with a 50 amp OCPD
Thanks for any help!
Also, how does the 120 volt power come into play on a range. Do the burners on the top use 120 volt power? And do you always calc you amp draw using 240 volt loading?
I am doing a little rewiring on a house and the owner has found a very old double oven/range with burners on the top that he wants to reuse.
The nameplate on the appliance says
115/230
120/240
KW=20.9
I have been trying to size this old monster and have come up with a few calcs.
I can use table 220.19A for a single oven, However it appears that it is over 12KW so I need to use the nameplate rating.
My KW is 20.9 so
20.9 x 1000 = 20900
20,900 /240 volts = 87 amps
If I go to branch ckt rating, 210.19A3, it tells me that the conductor for househod ranges shall have an ampacity not less than the rating of the branch ckt and not less then the max load to be served.
If I go to 422 for appliances, it tells me to use 220.19 and nothing about using 125% for my loading.
My first question. Am I not reading the table correctly for 220.19. If I am over 12 KW for one range, do I not use column C or can I use note 1 and still use the C column.
If I can use note 1, I come up with this for my range.
5% for each KW over 12.
so, 21 KW is 9 Kw over 12
so 5% for each Kw over 12 is = 45%
so max demand one range column C is 8 Kw
8 KW x 45% = 11.6 KW
11.6 KW /240 = 48.3 amps
It looks like I can run this with #6 and fuse with a 50 amp OCPD
Thanks for any help!
Also, how does the 120 volt power come into play on a range. Do the burners on the top use 120 volt power? And do you always calc you amp draw using 240 volt loading?