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Thread: NFPA 70E & VFD Safe Torque option

  1. #1
    Join Date
    Apr 2008
    Posts
    364

    NFPA 70E & VFD Safe Torque option

    Here is what I have a drive feeding a 30 HP motor with a Killark plug & Socket as local disconnect. The Killark socket is a interlocked disconnect with an auxiliary early break contact that is part of the safety circuit to disable the drive. As soon as I move the disconnect the safe torque option engages (shuts off the IGBT's) and as I continue to open the disconnect breaks the connection to the plug & socket. At this point do I need any PPE other than work gloves to pull the plug out of the socket?

  2. #2
    Join Date
    Aug 2004
    Location
    Northern illinois
    Posts
    15,650
    The safe torque off just turns off the torque. You could still conceivably still have voltage out at the connector just no torque at the motor.
    Bob

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