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  1. ScottQMiller

    UL 891 or UL 1773 for termination box cabinet

    Thanks for the response!
  2. ScottQMiller

    UL 891 or UL 1773 for termination box cabinet

    I am trying to determine, for a UL 891 Switchboard that is fed from a separate upstream termination box, whether the termination box would need to be listed under UL 1773 (Termination Boxes) or if it could be listed under UL 891. In reading the UL 1773 standard, many of the tests and assembly...
  3. ScottQMiller

    NFPA 820 Vented Boundary Between Class 1 Div 1, Div 2, and Unclassified

    I have a sewage pump lift station which I am working on, and trying to determine the boundary locations from Class 1 Div 1, to Class 1 Div 2, to Unclassified. NFPA 820 Figure A.4.2(c), as well as several other figures, shows a vent to atmosphere. Inside the wet well is a Class 1 Div 1 space...
  4. ScottQMiller

    Gearbox Wind-Up Torque/Force

    The discussion was a theoretical discussion on whether a no-back clutch (such as a Ringspann clutch) would see the highest loading if mounted on the output shaft, an intermediate shaft within the gearbox, or the motor shaft. I looked through the Ringspann article and it clearly is a complex...
  5. ScottQMiller

    Gearbox Wind-Up Torque/Force

    On a gearbox for a pump, the torque should be higher on the low speed side (the pump shaft) than the high speed side (the motor). I'm sure this is true for a steady state system. On startup, shutdown, or anytime the system undergoes a transient response (say the pump shaft is quickly torqued...

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