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Thread: AC Work

  1. #1
    Join Date
    Jan 2017
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    DC
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    AC Work

    I like to know what protection is in an isolation transformer that have earth ground on primary and secondary?
    Is this safe for the tech?

  2. #2
    Join Date
    Aug 2004
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    Quote Originally Posted by ecoguide View Post
    I like to know what protection is in an isolation transformer that have earth ground on primary and secondary?
    Is this safe for the tech?
    Isolation transformers generally provide little in the way of protection from electrocution. They might provide some level of protection from arc flash depending on the specific situation.

    I think you would need to provide some additional information on the specific situation you are asking about to get a more informed answer.

    The tech is "safe" if he follows the rules found in NFPA70E.
    Bob

  3. #3
    Join Date
    May 2005
    Location
    Richmond, Virginia
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    The purpose of an isolation transformer is to create a separately-derived power source that has no grounded circuit conductors. This is to minimize the risk of shock from contact with a circuit conductor, because there is no pathway back to the source through earth or nearby grounded surfaces.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

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