Residential Range Circuit Calculation

[Mustwin351]

I am looking at getting a new range but am a little unclear on the circuit required. It is a Fridigaire model fgef3035rf. http://www.frigidaire.com/Kitchen-Appliances/Ranges/Electric-Range/FGEF3035RF/?bvstate=pg:2/ct:r

According to its specifications it is rated at 13.5Kw. The nec for household ranges appears to only address single ranges below that Kw rating. So do I size my circuit as a continuous load at 125% of the name plate rating? (1.25X13.5Kw/240v=70.31 amps) So a 70 amp breaker? That does not seem right.

Interesting when you look up the specifications of this model fgef3035rf on fridgidaire's website the specifications state a minimum circuit of 40 amps is required. But if you read the installation instructions it does not state the required minimum circuit and has this strange table:

Please help me make sense of this.

 

[Dennis Alwon]

Note 1 to the table

12kw range-- demand is 8 kw plus 5% for each kw or major fraction over 12kw

13.5 kw- 12kw = 1.5 kw-- rounds to 2 kw

2kw X 5%= 10 %

8kw * 1.1= 8.8 kw

8800/240 = 36.67 amps or #8

 

[Mustwin351]

Note 1 to the table

12kw range-- demand is 8 kw plus 5% for each kw or major fraction over 12kw

13.5 kw- 12kw = 1.5 kw-- rounds to 2 kw

2kw X 5%= 10 %

8kw * 1.1= 8.8 kw

8800/240 = 36.67 amps or #8

I thought table 220.55 and Note 1 only applied if you had more than one cooking appliance and none of them could be over 12kw....Since my individual range is 13.5kw I didn't think I could use that method of calculation.

 

[Dennis Alwon]

I thought table 220.55 and Note 1 only applied if you had more than one cooking appliance and none of them could be over 12kw....Since my individual range is 13.5kw I didn't think I could use that method of calculation.

The range table is supposed to be simple but it is not..... Trust me I did it correctly Read the second sentence in note 1

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.

 

[Mustwin351]

The range table is supposed to be simple but it is not..... Trust me I did it correctly Read the second sentence in note 1

Got it! Thank you for clearing that up. Yes, that table definitely needs to be cleaned up.

 

[infinity]

Many ranges can be on a 40 amp circuit with a 50 amp receptacle. Just a note 40 amps is typically the minimum size required. {210.19(A)(3)}

 

[Mustwin351]

Many ranges can be on a 40 amp circuit with a 50 amp receptacle. Just a note 40 amps is typically the minimum size required. {210.19(A)(3)}

Interesting that a 20 amp receptacle is not allowed on a 15 amp circuit but a 50 amp receptacle is allowed on a 40 amp circuit.

I guess the odds of overloading the 15 amp circuit are greater but even still why present an opportunity for someone to overload a 40 amp circuit by allowing a 50 amp receptacle on it.

 

[infinity]

Interesting that a 20 amp receptacle is not allowed on a 15 amp circuit but a 50 amp receptacle is allowed on a 40 amp circuit.

Your statement is correct if you have more than one receptacle on the circuit say a 20 amp duplex on a 15 amp circuit. If you're using a single receptacle you can put a 20 amp receptacle on a 15 amp circuit.

For a range you won't find a 40 amp receptacle so the single 50 amp on the 40 amp circuit is OK.