Commercial Range Feeder Sizing

[ultramegabob]

I need to connect a commercial Vulcan range, total connected 28.8 KW at 240 volts (single phase) I figgure this as 120 amps total connected load, the previous range was smaller and on a 100 amp circuit, I was planning on running a 150 amp circuit, am I correct?

 

[ultramegabob]

or can I get away with 125 amp circuit since its a non-continuous load

 

[iwire]

As I see it 220.56 (2008) requires that one appliance to be calculated at 100%.

IMO it is not a continuous load and 1 AWG CU with it's 130 amp rating may be enough. I say maybe as you might need to make temperature adjustments. It stands to reason that this conductor may be operating in a much higher ambient temperature then 86 F.

 

[ultramegabob]

the wire will be pulled through a crawlspace and it enters the range from the bottom directly through a hole in the floor.

 

[iwire]

Sounds like your good to go.

You could even use 1/0 AL if you wanted. MC comes in AL and can be run at 75C. You might be able go with AL SER but then your restricted to 60C (2008)

 

[ultramegabob]

Thanks, that helps cut some cost...

 

[ivsenroute]

Providing this is not a commercial range being installed in a residential application, the demand factor will be 100% (220.56) AND if this range considered a continuous load, then I am not really sure how 210.19, 210.20 would apply because we don't know what type of material you are using.

Neutrals are a whole other issue.