# 21 amp three phase heater

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#### caosesvida

##### Senior Member
(21 amps on each leg) 440, three phase heater,
21 * 440 * 1.73 = 15985 watts . is this correct? There is no power factor on pure resistance loads, right? thanks

#### dereckbc

##### Moderator
Staff member
Re: 21 amp three phase heater

For three-phase W= E x I x PF x 1.73 Go figure. Hint PF = 1 on pure resistive load.

[ January 30, 2004, 02:05 PM: Message edited by: dereckbc ]

#### gazzoo

##### Member
Re: 21 amp three phase heater

Originally posted by caosesvida:
(21 amps on each leg) 440, three phase heater,
21 * 440 * 1.73 = 15985 watts . is this correct? There is no power factor on pure resistance loads, right? thanks
No, your ANSWER TOTAL is not correct. PF=1 on a purely resistive load. Once you get the right answer try to find the resistance on the load post back with the resistance total. Have fun!

#### bob

##### Senior Member
Re: 21 amp three phase heater

(21 amps on each leg) 440, three phase heater,
21 * 440 * 1.73 = 15985 watts . is this correct? There is no power factor on pure resistance loads, right? thanks
If the voltage is truley 440 volts, your answer looks correct to me. There is a power factor involved. It just happens to be 1 or unity.

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