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Missing ground prong on sump pump plug

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From Scott:


I have a double plug sump pump and on a recent home inspection the inspector noted there is not a ground prong that goes into the sump receptacle. It appears there never was one though there is a place in the plug where there could have been at one time. An electrician told me it would be cheaper to replace the whole pump rather than get a new plug assembley. Does theis sound right to you?
asked in Sump Pump by darekrudy (21,730 points)
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1 Answer

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Hi Scott,

The first plug that goes into the receptacle is a pressure switch / floating device plug (whichever you have). The second one is a pump motor power supply. If it’s only the first one that is missing the ground you have 3 options:

  1. If the switch is separate from the pump / not permanently attached to it, you can replace the switch with its cord (search Google for “sump pump floating switch” – starts about $30+ / make sure you have a proper rating (Amps) for your pump)
  2. If both cords go into the pump’s main body / enclosure, replacing just one of them might not be possible at all because it is factory sealed to prevent water penetration – you would need a new pump assembly.
  3. If both cords go into the pump’s main body / enclosure – disconnect this ground missing plug, coil the cable and secure it to the discharge pipe above the well cover.

    Buy a floating switch rated for the size of your pump, secure it to the pump enclosure / adjust the floating cable so it responds properly to the rising water level, assemble both plugs: pump motor plug — switch plug — outlet receptacle.
answered by darekrudy (21,730 points)