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    tableclocks's Avatar
    tableclocks Posts: 432, Reputation: 2
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    #1

    Mar 27, 2008, 07:42 PM
    20 kw furnace
    Follow up on my furnace... it has 2 240 60 amp brakers built in... do I have to use 2 240 60 amp brakers in my 200 amp service panel? 6/3 wg wire? That's 2 lines of 6/3 wg from my panel to my furnace?. thank you
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Mar 27, 2008, 07:59 PM
    Your system should have a rating plate telling you what you need. With 20 kw the heat strips will be around 84 amps the blower may pull around 5 or 6 amps.
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #3

    Mar 27, 2008, 08:02 PM
    Yes # 6 copper is the proper size for a 60 amp breaker.
    You mention 2 pcs 240 Volts 60 amps breakers.
    That means two circuits each of 60 Amps at the furnace.
    Which requires 2 sets of wires rated for 60 Amps (=6 copper) from the furnace breakers to the service panel. And on the panel 2 breakers of first available higher rating than 60 Amps.
    Don't forget the earth wires.
    Success.
    :)
    erjskashyap's Avatar
    erjskashyap Posts: 2, Reputation: 1
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    #4

    Mar 28, 2008, 03:06 AM
    Pl. Tell me 0totel summary of close & open loop in HVAC.
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