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  1. #1
    Join Date
    Apr 2012
    Location
    ny
    Posts
    8

    Neutral or not to Neutral?

    Here's a good one for all you electrical buffs who would like a brain teaser...
    Would like to know everyone s thoughts on switching the neutral when installing or using a generator through a manual transfer switch Do you need to switch the neutral in order to isolate it from sending transient voltage back to the utility company? I say no only because the ground comes into contact with the neutral so all stray voltage will take the least path and leave through the ground...What are your thought guys?

  2. #2
    Join Date
    Feb 2013
    Location
    Phoenix, AZ
    Posts
    198
    If the neutral conductor from the genset is grounded at the genset (separately-derived system), the neutral must be switched such that it is grounded either through the genset OR the bonding jumper, never both. If the neutral from the genset is floating (non separately-derived), then the neutral need not be switched.

    Note that having a genset with grounded neutral connected to a service with the normal bonded neutral can create a very dangerous situation during certain fault conditions and should never be done.

    Here's a good treatment of the subject:

    http://www.cat.com/cda/files/99865/7/LEXX0604-01.pdf

  3. #3
    Join Date
    Apr 2012
    Location
    ny
    Posts
    8
    OK...now would it be safe to say if I have continuity between the neutral and ground than I don't have to switch the neutral?

  4. #4
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,518
    Quote Originally Posted by lx2077bob View Post
    OK...now would it be safe to say if I have continuity between the neutral and ground than I don't have to switch the neutral?

    Okay, which neutral and which ground are you asking about now?

    Did you read the articles that I mentioned when you posed this question up in the other section?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,518
    Quote Originally Posted by lx2077bob View Post
    Here's a good one for all you electrical buffs who would like a brain teaser...
    Would like to know everyone s thoughts on switching the neutral when installing or using a generator through a manual transfer switch Do you need to switch the neutral in order to isolate it from sending transient voltage back to the utility company? I say no only because the ground comes into contact with the neutral so all stray voltage will take the least path and leave through the ground...What are your thought guys?

    My suggestion is to install it according to code.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







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