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Thread: GFI protection

  1. #1
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    GFI protection

    Recently had numerous outlets in a medical procedure area where plug tester was showing open ground. I had been asked to install gfi protected outlets as this is considered a "wet" area. Medical equip tech informed me that there is a "floating ground system" present. What is this? How does it work? Does it negate the need for GFCI protection of personnel?

  2. #2
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    Sounds like an Isolated Power System, see 517.160. Is there a panelboard with a Line Isolation Monitor in the area?
    If it is an Isolated Power System your plug tester will show faults, the system does not have a neutral, it is 60v / 60v L-L. You do not need GFCI's on these systems.

    Roger
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  3. #3
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    Quote Originally Posted by roger View Post
    Sounds like an Isolated Power System, see 517.160. Is there a panelboard with a Line Isolation Monitor in the area?
    If it is an Isolated Power System your plug tester will show faults, the system does not have a neutral, it is 60v / 60v L-L. You do not need GFCI's on these systems.

    Roger
    Yes, make sure it isn't one of these before proceeding with anything. GFCI could even be undesired here, there is a reason it is set up like it is, if that is what it is.
    I live for today, I'm just a day behind.

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