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Thread: NFPA 20 versus NEC

  1. #11
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    Quote Originally Posted by hhsting View Post

    If Bkr #1 or Bkr #2 is sized per NFPA 20 then how would then one size Fdr #1 equipment grounding conductor or is it even equipment grounding conductor?
    I think 250.122(D)(2) would apply.

  2. #12
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    Quote Originally Posted by david luchini View Post
    I think 250.122(D)(2) would apply.
    Ok but exact size of Bkr #1 is not know. NFPA 20 says shall not be less than 115 percent of motor full load amps. So their is no maximum.

    Also what would be the service disconnect the Bkr #1 sized by NFPA 20 or need additional breaker as service disconnect?
    Last edited by hhsting; 06-14-19 at 02:32 PM.

  3. #13
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    Quote Originally Posted by hhsting View Post
    Ok but exact size of Bkr #1 is not know. NFPA 20 says shall not be less than 115 percent of motor full load amps. So their is no maximum.
    Size of BKR #1 is not relevant to 250.122(D)(2).

    You know motor HP, figure the maximum permitted dual-element fuse for that HP, and size the EGC per that fuse size.

  4. #14
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    Also what would be the service disconnect the Bkr #1 sized by NFPA 20 or need additional breaker as service disconnect?

    Sent from my SM-G935U using Tapatalk

  5. #15
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    Sketch attached in post#10: If its service rated fire pump/controller/breaker all in one then should not their be another breaker other than Bkr #1 which is sized per NFPA 20 for service disconnect in the equipment or outside or can Bkr #1 sized per NFPA 20 be used as service disconnect? Anyone here know? Appreciate your input

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