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Thread: Old EGC style, which code cycle?

  1. #11
    Join Date
    Oct 2017
    Location
    San Jose, Calif.
    Posts
    3
    Quote Originally Posted by user 100 View Post
    What you described is very typical for that time period- only recs in certain areas (like the areas you mentioned) were required to be grounded. One old NEC rule was that metal boxes within x number of feet of grounded objects (plumbing) were to be grounded- you'll see grounded boxes/ recs in old kitchens near the sink, but the ones near the dinner table across the room won't be.

    They would also bond the metal shell light fixtures in those areas by running that separate egc beside the 2w nm to the ceiling box- very common to see the light and even the light switch box in an old bath grounded thru an egc snaked thru the wall and clamped to the old galvanized plumbing.

    FWIW, the separate egc method is still sort of permitted- see 250.130(C)
    Yup, the egc connects to an abandoned ceiling box for the kitchen light and the porch light. Thank you for the the history lesson!

    The egc gets connected back to the service panel via a copper plated strap to the copper water pipe in the kitchen, then to a solid 6 awg conductor pipe clamped near the garden hose bib. Or I should say it did. During a service upgrade it appears this was disconnected in favor of a ufer ground available from new pool construction and a new gec. Also the EMTs for range and dryer were cut and segments of liquidtight were used to interface with the new panel. And there was no bonding around the liquidtight. Hey, old EGCs need love too!
    This was done by a licensed contractor that proudly put their sticker on the panel door

  2. #12
    Join Date
    Jun 2015
    Location
    texas
    Posts
    1,513
    Quote Originally Posted by KWillis View Post
    Yup, the egc connects to an abandoned ceiling box for the kitchen light and the porch light. Thank you for the the history lesson!

    The egc gets connected back to the service panel via a copper plated strap to the copper water pipe in the kitchen, then to a solid 6 awg conductor pipe clamped near the garden hose bib. Or I should say it did. During a service upgrade it appears this was disconnected in favor of a ufer ground available from new pool construction and a new gec. Also the EMTs for range and dryer were cut and segments of liquidtight were used to interface with the new panel. And there was no bonding around the liquidtight. Hey, old EGCs need love too!
    This was done by a licensed contractor that proudly put their sticker on the panel door
    And you have found one of the 2 main pitfalls when this method found its path to the source thru the pipes instead of going to the panel. The other is when plastic replaces that ancient pipe......

    Regarding the disconnected #6- if there is still 10ft of the old metal pipe in the ground, it needs to be reconnected, as the old pipe would qualify to be used as an electrode. And whatever the status of that pipe in the ground, the pipe in the house needs to be bonded to the panel anyway- See 250.52(A)(1) and 250.104(B)(1-5)

    And as far as the potential for the pipe being replaced, meaning the recs in those areas you mentioned would lose their egcs-go ahead and up those recs that rely on the separate egc to gfci- (they prolly already are considering the locations, but if not.....) and/or talk to the customer about pulling new ckts for those locations and disconnect the old egc or tie it into the egc from a new ckt-prolly need add'l ckts for those areas anyway with the age of the house.
    Last edited by user 100; 10-11-17 at 06:42 PM. Reason: added code references for op

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