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AssuredElectrical
AssuredElectrical, Master Electrician
Category: Electrical
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Experience:  Contractor-42+ Years in the ElectricalTrade
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WHAT IS PROPER SIZE ELECTRIC HEATERS EACH 8 kh 3 PHASE 208

Customer Question

hI ***** SIZE FOR TWO ELECTRIC HEATERS EACH 8 kh 3 PHASE 208 VOLT
Submitted: 1 year ago.
Category: Electrical
Expert:  AssuredElectrical replied 1 year ago.

Welcome. My name is ***** ***** would be glad to assist.

One 8 kw heater at 208 3 phase will operate at approx 22 amps each

Which calculates at 2 x 22 or 44 amps.

Code requires a feeder of 125% of the load when wiring heat, so that then calculates at 55 amps total.

For 55 amps, you need #8 THHN wiring, if only a short distance of 100 ft or less and then to #6 THHN wire over that length.

On 55 amps, a 60 amp breaker is closest so that would be used for the main feeder.

Let me know anything further needed,

Thanks

Expert:  AssuredElectrical replied 1 year ago.

Sorry, that is #8 copper wire THHN.

Thanks