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  • Users: JSong
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  1. JSong

    Grounding rod spacing

    Hi, If designing grounding for a new fabrication facility that is 500’W x 1000’L and that it is intended to have a perimeter ground grid, plus we plan on installing 10’L ground rods periodically, what's the appropriate spacing for those rods? NEC 250.53 (B) requires a minimum of 6-ft between...
  2. JSong

    Motor Circuit Surge Surpression

    Dear all, We have a temperature limit switch that controls a 1/6 HP single phase motor/fun. This limit switch is 1/2HP rated according to the product sheet, however, it failed (welded and shut) due to arcs across the contacts caused by inductive kicks. I am wondering if there is a practical...
  3. JSong

    Temperature Limit Switch Failure

    Hi all, We had a temperature limit switch failure problem in a heat exchange fan control circuit. The fan is a 1/6 HP single phase motor, and it is controlled by a Honeywell 'BM-2R-A2' temperature limit switch. This limit switch is rated for 1/2 HP that shouldn't have any problem in a 1/6 HP...

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