elect furnace

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wigi

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If you have an elect. frnce 15kw what is the min. ocpd allowed by code name plate read L1 68a/ 77a and L2 70/80 ,208/240 using 240v I will appr. your answr
 
Re: elect furnace

All manufacturers are required to place a data plate on the unit min ampacity for wire size and max breaker size .Go by that and alls good.
 
Re: elect furnace

Sorry posted to soon and didn`t see that you listed the max ocpd 80 a ocpd,Curious what is the wire feeding this monster
 
Re: elect furnace

in your post you said min ocpd, most units I see have min ciurcit max ocpd. from what you have posted I would say L1 80amp L2 80amp ocpd's

[ December 28, 2005, 05:19 PM: Message edited by: wyatt ]
 
Re: elect furnace

name plate readings are as followed
htr KW amp min circt max
10/14 54/61.7 67.5/77.2 70/80
single supply circuit
fed with awg 4 s.e cable 240volt single ph
 
Re: elect furnace

The heater is 10KW at 208 volts, 14 KW at 240V.

It draws 54 amps at 208v, 62 at 240V.

67.5 and 77.2 are your minimum circuit ampacity - use to find the minimum size wire and branch breaker. So at 208, the minimum breaker would be 70A, and at 240, the minimum breaker would be 80A.

Finally, the maximum breaker sizes are give, and they are the same as the minimum sizes above. So you have to use a 70A for 208V, or an 80A for 240V.

The 60 degree ampacity of #4 wire doesn't seem to be sufficent for a 240V installation.

Steve

[ December 28, 2005, 05:32 PM: Message edited by: steve66 ]
 
Re: elect furnace

70/80 208/240 this means 70 amps at 208 volt 80 amps at 240 volts does this help? is the wire al or cu?
 
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