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Thread: Fire Pump Service & Utility Company Responsibilities?

  1. #21
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    3,670
    Quote Originally Posted by steve66 View Post
    I'm paraphrasing here, but the first sentence basically says "Where the service voltage is different than the fire pump voltage a transformer shall be permitted between the system supply and the fire pump controller."

    So this only applies when the source voltage is different than the fire pump voltage. Note that "source" or "service" refers back to the sources listed in 695.3, so the source or service is the "Electric Utility Service Connection". As a result, 695.5 only applies for a customer owned transformer after the service, or a transformer connected to a generator or an on site power production facility.


    Again, I still agree with you that the utility primary fusing should carry the locked rotor current, or an alternate source must be provided, but that's just not the right paragraph to quote.

    I do not agree with this:



    And overcurrent protection is permitted on the secondary side of a utility transformer that supplies a fire pump, just not on the secondary of a privately owned transformer.
    There is no customer owned transformer. There is ONLY the POCO transformer. Now what????

  2. #22
    Join Date
    Jun 2003
    Posts
    6,373
    Quote Originally Posted by gadfly56 View Post
    There is no customer owned transformer. There is ONLY the POCO transformer. Now what????
    Then they can have a disconnect with overcurrent protection between the service and the fire pump per 695 B 1. The OCP does have to be able to carry the locked rotor current indefinitely.

    And from your first post, I believe the utility needs to size the primary OCP to also carry the locked rotor current indefinitely, or an alternate source needs to be provided (for example, an emergency generator).

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