Electrical grounding

Discussion in 'Electrical Forum discussion & Blog' started by Brian2147, May 28, 2019.

  1. Brian2147

    Brian2147 New Member

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    Upgrading my electrical in a triplex . From adding neutrals And grounds and such. Do I need a separate ground from the service disconnect to the panel in my apartment or does the FMC runway handle that.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Retired Systems engineer for defense industry.
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    Your individual breaker panel is probably considered a sub-panel of the structure...if that is the case, you need a 4-wire cable: L1 L2 Neutral Ground to it. ANd, in that panel, the ground and neutral wires should be on their own buss. In a main panel, the ground and neutral are tied together, but that should be the only place where that's true in the structure.
     
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  4. Stuff

    Stuff Active Member

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    FMC wouldn't provide a good ground. AC or MC would be fine. They may look the same but are manufactured to different specifications.
     
  5. Brian2147

    Brian2147 New Member

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    Thanks
     
  6. Brian2147

    Brian2147 New Member

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    I guess the next question would be what size do I make the ground wire. There a table I can refer to. Thanks
     
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

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    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    What size is the panel's main breaker? Keep in mind, the ground lead should never have any current running through it unless there's a fault. It needs a low enough resistance to trip the breaker, but because that happens in no more than a few seconds, it doesn't need to be as large as the current carrying conductors since it won't heat up much in that few seconds. If you run a new cable rather than individual wires in a race or conduit, it will be sized properly for the current carrying leads. I'm sure there are charts out there...don't know off the top of my head.
     
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  8. Stuff

    Stuff Active Member

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    NEC Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
     
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