80% max. ckt load

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Bill W said:
I don't think so. I read it as add 5% to the 80% for each kw over 8 3/4, perhaps I should have chosen 90% rather than 85%, but I still calculate at least 35.4 or greater. I'm often wrong, especially when I'm sure I'm right.
To Celtic: in the notes...
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According to the parenthetic note in the table heading (Column C to be used in all cases except as otherwise permitted in note 3),I would simply use Column C for a range or ranges(s) not over 12 KW.

One range not over 12KW would have a maximum demand of 8KW.
 
infinity said:
According to the parenthetic note in the table heading (Column C to be used in all cases except as otherwise permitted in note 3),I would simply use Column C for a range or ranges(s) not over 12 KW.

One range not over 12KW would have a maximum demand of 8KW.
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Right...just figured that out, finally... so 8000/240=33.3. yeah, yeah, yeah...50/.80=40A permissible load. Now what about that 50% stuff on cord and plug fixed equipment you mentioned earlier, I'm sure there is a difference between equipment and appliances...right?
 
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Bill W said:
Now what about that 50% stuff on cord and plug fixed equipment you mentioned earlier, I'm sure there is a difference between equipment and appliances...right?
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There is a difference...
the 50% ruling is for 15- or 20-ampere branch circuits fastened in place(210.23(A)(2) )

The range receptacle - 210.21(B)(4)..which directs you back to T220.55
 
I am not sure how 210.23 (A) ?(D) is applicable to what you guys are discussing unless the range you are discussing is on a multi-outlet circuit.
(C) 40- and 50-Ampere Branch Circuits. Is applied most commonly to a range circuit when the cook top and oven are separate appliances feed from the same branch circuit. A lot of kitchens have a built in range and a cook top wired to a common junction box making the circuit multi- outlet.
 
david said:
I am not sure how 210.23 (A) ?(D) is applicable to what you guys are discussing unless the range you are discussing is on a multi-outlet circuit.
(C) 40- and 50-Ampere Branch Circuits. Is applied most commonly to a range circuit when the cook top and oven are separate appliances feed from the same branch circuit. A lot of kitchens have a built in range and a cook top wired to a common junction box making the circuit multi- outlet.
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I never mentioned 210.23 in regards to the range.

The post got a bit sidetracked...we originally started talking about a 20A circuit with an 18A load, then went onto ranges.

It's all infinity's fault :D ;) :D
 
celtic said:
I never mentioned 210.23 in regards to the range.

The post got a bit sidetracked...we originally started talking about a 20A circuit with an 18A load, then went onto ranges.

It's all infinity's fault :D ;) :D
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Thanks Celtic.....
 
infinity said:
Thanks Celtic.....
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BEEP BEEP BEEP...
...watch out for that bus backing-up infinity
rove_wheel.jpg

I moonlight as a bus driver

LMAO
 
Here is another one I see occasionally; Electric hot water heater with 4500 watt elements. Hooked up using 12/2 MC with 20 amp OCPD. (4500/240=18.75A). This installation is hard wired, on an individaul circuit so 210.23 (a) or (b) should not effect it
 
FrancisDoody said:
Here is another one I see occasionally; Electric hot water heater with 4500 watt elements. Hooked up using 12/2 MC with 20 amp OCPD. (4500/240=18.75A). This installation is hard wired, on an individaul circuit so 210.23 (a) or (b) should not effect it
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A hot water heater is considered by the NEC to be a continuous load. 18.75(125%)=22.5 amps. You need a 30 amp circuit. Look at 210.20(A) and 422.13.
 
Bill W said:
Not sure but my quick response is 220.55. Not over 12kw use column C=80% increasing 5% for each kw over 8 3/4. So, 10kw/240=41.67/.85=35.4
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Column C says to increase 5% for every KW over 12 not 8.75
 
infinity said:
A hot water heater is considered by the NEC to be a continuous load. 18.75(125%)=22.5 amps. You need a 30 amp circuit. Look at 210.20(A) and 422.13.
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Most of the houses I encounter these days utilize a 25 Amp circuit for such loads.
 
Going back to your original question, If the 20a cb tripped on a circuit supposed to draw 18 amps then I would check the actual draw on the circuit.maybe more than 20a?. Heck, many circuits I come across are running 100% and sometimes more without the bkr tripping.Anyway, 210.23(a)(1) 80% rating of branch ckt, means 25a cbkr. but conductors not at 125% but rating of load. #12 awg...Can I get an A-men?
 
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Survey says?

Survey says?

Bill W-

Ok, you have some good answers; now finish the riddle already:

What's short and green, has a 20 Amp cord/plug but draws 18 Amps continuous?

(You can ignore the "short & green" part if you don't think it's funny;) )

Charlie asked me once to name a house hold 20A/120V appliance and I drew a blank. Apparently not everyone has their own lab equipment--and if they do then they're in the wrong forum. . .
 
DGrant041 said:
What's short and green, but draws continuous?

(You can ignore the "short & green" part if you don't think it's funny;) )
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I chose to ignore most of the other words and here's what I found....

















08.jpg
 
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