21 amp three phase heater

[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

 

[dereckbc]

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]

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]

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.