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Hi. I'm making a 3 phase furnace with heating coils. Total power rating is 5 KW. I have to make one heating element for each phase. How do I split the KW rating? Will it be a straight 5/3? Also when calculating the resistance for each heater, should I calculate based on 220V(single phase voltage in India) or 440V (3 phase voltage)?
 
you must firstestablish whatvoltage teach coil requires.if it's 230V per coil, then 415V is :
View attachment 50546
In delta each coil would be 5000/3 = 1666watts.So res of coil would be v squared/watts = 440sq/1666=116ohms per coil.If you say the single phase v is 220,3 phase should be 380v not 440v,unless its a wierd system.
Regards,S
 

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