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  • Users: steelerr
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  1. steelerr

    Hipot testing of 3-phase motors and equipment

    Hi everybody, I have to perform Ground Bond (GB), Insulation Resistance (IR) and Dielectric Withstand (DW - a.k.a. Hipot) testing on new 3-phase industrial equipment as part of a third-party electrical safety certification. I will soon purchase an Electrical Safety Tester (EST) to perform these...
  2. steelerr

    NFPA 79 - wire nuts not suitable for motor connections ?

    In NFPA 79-2007, Clause 13.5.9.2 states, "Electrical connections at motor terminal boxes shall be made with an identified method of connection. Twist-on wire connections shall not be used for this purpose." What I think this means that wire nuts cannot be used in motor 'peckerheads'. Other...
  3. steelerr

    Category 3 safety circuit requirements

    Is a RESET pushbutton required for Cat. 3, or is that just a "recommendation"? I see lots of examples of the RESET pushbutton in mfg. literature, but no reference to a requirement. I do have the required redundancy, feedback aux. contacts, safety-rated interlock switch and E-Stop pushbutton...

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