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Thread: Grinder Pump Float Signal wire type and gauge

  1. #1
    Join Date
    May 2007
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    27

    Grinder Pump Float Signal wire type and gauge

    Have to wire a Meyer grinder located in an outdoor holding tank located 125 feet from panel/alarm inside the residence.

    I'll be feeding the signal wires through 3/4" T&B Smurf conduit. Just wondering the type and gauge wire I need to source for to carry the signals the 125 foot distance from the outdoor grinder to the indoor panel/alarm station. As far as the grinder power, the 2 HP grinder will be fed off a subpanel appropriately fed from the house's main panel. No question(s) regarding that part of the install.

  2. #2
    Join Date
    Jun 2003
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    All I've ever seen are float switches that can be either LV or 120v. Really no current involved so I see no reason you can't use THWN of a size determined by whatever the OCP is for the control circuit, if any.

    -Hal

  3. #3
    Join Date
    Jan 2016
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    do you have any info on the control panel? mfg/model/pn etc
    most I have seen are 120 but only drive a relay (which drives the contactor)

  4. #4
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    Correct. The control panel instructions should have all the information you need.

    -Hal

  5. #5
    Join Date
    Feb 2007
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    If the floats are intrinsically safe you might need a shielded wire. Been a while since I have done one.

  6. #6
    Join Date
    May 2007
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    27

    Grinder pump signal wire gauge

    It is a Simplex panel. Will get the model # tomorrow as it's 300 miles north of my location today. I'm still concerned about "crosstalk" between the single phase 220 and the signal wires (9 of them I believe), in a 1" PVC conduit over a distance of 125'. Grinder is a 2 HP Meyers. I will have 3 floats and the thermal wires and one other signal wire and perhaps a spare. Was thinking if high voltage, then #12 would suffice for signal wires. Power will be tapped off subpanel 35 feet away, so I believe #12 would suffice to power grinder pump.

  7. #7
    Join Date
    Nov 2014
    Location
    Miami, Florida, USA
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    Are you pumping sewage?

  8. #8
    Join Date
    Jul 2006
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    San Francisco Bay Area, CA, USA
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    Quote Originally Posted by Russs57 View Post
    Are you pumping sewage?
    I can’t imaging another use for a grinder pump...
    __________________________________________________ ____________________________
    Many people are shocked when they discover I am not a good electrician...

  9. #9
    Join Date
    Nov 2014
    Location
    Miami, Florida, USA
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    184
    If he is, he will need explosion proof seals so methane gas doesn’t travel up conduits. Nobody mentioned so I wasn’t assuming.

    Put the thermal wiring with pump wiring and all the float switches in another raceway.

  10. #10
    Join Date
    Jun 2003
    Location
    Hawthorne, New York NEC: 2014
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    Quote Originally Posted by Jons View Post
    It is a Simplex panel. Will get the model # tomorrow as it's 300 miles north of my location today. I'm still concerned about "crosstalk" between the single phase 220 and the signal wires (9 of them I believe), in a 1" PVC conduit over a distance of 125'. Grinder is a 2 HP Meyers. I will have 3 floats and the thermal wires and one other signal wire and perhaps a spare. Was thinking if high voltage, then #12 would suffice for signal wires. Power will be tapped off subpanel 35 feet away, so I believe #12 would suffice to power grinder pump.
    Why do you think they are "signal" wires? Thermal wires? You mean power for heat tape?

    -Hal

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