New Disconnect Box

Discussion in 'HVAC Heating & Cooling' started by Phillbo, Jul 15, 2009.

  1. Phillbo

    Phillbo Member

    Nov 24, 2008
    I got a quote to have my disconnect box replaced. The unit is 50amp rated but the description in the quote states "Replace disconnect box for packaged heatpump system (60A style with new fuses". Is the "60A Style" a type of box or is he planning to put in 60A fuses?

    I have a call out to ask but figured why not throw it on here as well.. It might just be what the box ids called.

    What negative impacts would be caused by using 60amp fuses in a 50amp rated unit?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    The size of the disconnect is dictated by the manufacturer of the device you are trying to disconnect. If they specify 50A, and you install 60A, it shouldn't pass inspection. But, that is often a maximum that the thing can support. IF you can find the same series fuses rated for 50A, you could put them in there.
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  4. jbfan74

    jbfan74 Electrical Contractor

    Jun 14, 2007
    Electrical Contractor
    Newnan, GA
    Disconnects are rated 30 amp, 60 amps, 100 amps, and take fuses sized up to the disconnet rating.

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