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Glen O
Glen O asked in Home & GardenMaintenance & Repairs · 1 decade ago

what size wire do I need for a 40Amp wall furnace?

6 Answers

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  • William B
    Lv 7
    1 decade ago
    Favorite Answer

    for a 40 amp draw, you need a # 8 Gage wire

    Source(s): maint man /electrician
  • ppe
    Lv 5
    1 decade ago

    8 g

  • ?
    Lv 4
    1 decade ago

    6/2 wire

    40 amps is a lot

  • gr8music at qtrtilldawn
    Lv 6
    1 decade ago

    12 gauge would handle a 120vac furnace, 10 gauge for a 220vac furnace. It also depends on the distance it travels.

    Source(s): http://www.powerstream.com/Wire_Size.htm
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  • Rondi
    Lv 5
    1 decade ago

    8 gauge.

    Don't let anyone talk you into using 10 gauge.

  • I FIX IT
    Lv 4
    1 decade ago

    It depends on your cable length.

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