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  1. #1
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    Default Wire Size Chart With Grounding Conductor

    I'm looking for a wire sizing chart that also has the minimum size conductor for the ground. I've searched my electical contractors book and it has all the wire sizing charts for voltage drop, etc but they don't include the ground size.

    For example, a 200 amp service needs a 4AWG ground wire. I think 100 Amp is 8AWG. I'd like a chart that goes from 350 Amp service down to whatever size it is where the ground and hot/neutral are the same (I think its maybe 20 or 30 Amp).

    If anyone has an online reference, please post the link for me.

    Thanks!
    John Deere 5420/4WD/FEL, PwrReverser
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  2. #2
    Veteran Member buckeyefarmer's Avatar
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    Default Re: Wire Size Chart With Grounding Conductor

    Table 250-95 of NEC
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  3. #3
    Super Member Inspector507's Avatar
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    Default Re: Wire Size Chart With Grounding Conductor

    I think you're confusing 2 different NEC Tables. Table 250-66 sizes the Grounding Electrode Conductor that you would use for services which is different than Table 250-122 which sizes Equipment Grounding Conductors for Branch Circuits and Feeders.

    BTW there is no Table 250-95 in the NEC.


  4. #4
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    Default Re: Wire Size Chart With Grounding Conductor

    I'm looking for both. I don't have a table that has the ground size for service entrance or branch circuits (if they are different).

    I did find several on-line references to NEC table 250-95.
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  5. #5
    Super Member Inspector507's Avatar
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    Default Re: Wire Size Chart With Grounding Conductor

    Quote Originally Posted by GaryBDavis

    I did find several on-line references to NEC table 250-95.
    Table 250-95 last appeared in the 1996 NEC. In 1999 all of Article 250 was reorganized. It was changed to 250-122.


  6. #6
    Super Member Inspector507's Avatar
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    Default Re: Wire Size Chart With Grounding Conductor

    This site has a calculator for both.


  7. #7
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    Default Re: Wire Size Chart With Grounding Conductor

    Cool site. Thanks!
    John Deere 5420/4WD/FEL, PwrReverser
    8MX Shredder, Belltec TM-48-HTL PHD, WR Long RBG Grapple, 12" Tree Terminator & more...

  8. #8
    Veteran Member buckeyefarmer's Avatar
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    Default Re: Wire Size Chart With Grounding Conductor

    Quote Originally Posted by Inspector507
    Table 250-95 last appeared in the 1996 NEC. In 1999 all of Article 250 was reorganized. It was changed to 250-122.

    Thanks, 96 is last code book I bought.
    L3940HSTC, QA FEL, BH92
    L5030HST,QA,FEL
    MF 205-4
    Husqvarna YTH24V48LS (the other orange)
    KK Finish Mower, KK Tiller, 6' rotary mower, Pallet forks, PHD, Blade, Carryall, cultivator, 2 wheel barrows, assorted gardening tools,

  9. #9
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    alex.are
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    Default Re: Wire Size Chart With Grounding Conductor

    I have 38 KA,short circuit current .The earthing area is 40X80 meters,soil resistivity=420 ohm.meter.Iam asking about the most suitable earthing grid conductor size & the quantity& size of earthing rods?

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