Calculating Current Using 2- out of 3-Phases

I have a 3kw heater and am using 2 of 3 phases to power it (3ph. 208V).

Is I = P / (V*sqrt(3)) correct?

Tx.

For 3 phase power we know that P = 3*I*V (where I and V are phase values). Since this is 3 phase power we have a multiplier of 3. If you have 2 phases, I would imagine it would be P = 2*I*V (where I and V are phase values).

208 = line-to-line voltage
120 = phase voltage

So I would imagine your current would equal I = P/2*V

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http://www.rapidtables.com/calc/electric/kW_to_Amp_Calculator.htm

Good Luck Mr.Steve

Regards,
Ankim

Thanks, but that seems like it's using all 3 phases... does that matter?

From my understanding it should not matter since the voltage between two phase out of three will be 208V. Since all three phases carry voltage equally. The advantage of this is the ability to have lower conductor currents while maintaining low load voltages.

The current consumption in two phases connected to heater will be more , it will have imbalance on rest of the circuit

Should properly balance the circuit load.

Cable and breaker sizing should be properly done connected to heater.
Good Luck