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Thread: Bonding of Instrument stands to ground grid

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    Bonding of Instrument stands to ground grid

    Does the NEC require instrument stands with transducers, transmitters, etc @ 24VDC and under 1A, to be bonded to the ground grid in a Class I Division 2 area?

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    What is it that you are calling an instrument stand?

    By bonded to the ground grid do you mean that an equipment grounding conductor should be run out to the stand with the circuit conductors and somehow bonded to that stand or are you suggesting some kind of conductor that should be connected to Earth?
    Bob

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    250.112(I) states the circuit doesnt need to be grounded if its Class 2 wiring under 50VDC - however, our inspectors want to see the stand - galvanized C6-channel - bonded with #2AWG down to the equipotential ground grid which is a buried #4/0 bare copper and runs throughout the entire Plant - mostly Class I Division 2, C & D.

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    Quote Originally Posted by Isaiah View Post
    ... - however, our inspectors want to see the stand - galvanized C6-channel - bonded with #2AWG down to the equipotential ground grid which is a buried #4/0 bare copper and runs throughout the entire Plant - mostly Class I Division 2, C & D.
    Fairly common heavy industry/ petrochem project specification. There is no code requirement for that.
    Don, Illinois
    (All code citations are 2017 unless otherwise noted)

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    Quote Originally Posted by don_resqcapt19 View Post
    Fairly common heavy industry/ petrochem project specification. There is no code requirement for that.
    Yep that’s what I thought


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