Page 3 of 3 FirstFirst 123
Results 21 to 23 of 23

Thread: tap rule clarification

  1. #21
    Join Date
    Feb 2003
    Location
    Pennsylvania
    Posts
    2,365
    Quote Originally Posted by hardworker View Post
    I need you to refresh my memory concerning tap rule.

    400 amp single phase service for a commercial building. 400 amp main fused disconnect is the first overload protection. I need to tap the 400 amp d/s to install a 200 amp fused disconnect downstream. What is the furthest the 200 amp d/s can be located from the 400 amp d/s?

    Many thanks.
    Quote Originally Posted by infinity View Post
    Since you're using a 200 amp tap to a 400 amp feeder you can use the 25' tap rule which for the tap conductors is 1/3 the ampacity of the OCPD ahead of the tap. This is assuming that your tap will be on the load side of the service disconnect.

    see post #3
    You say you need to tap a 400 amp main service fused disconnect, are you tapping the line or load side of the service disconnect?

    Since you are asking about the tap rule that implies the load side of the service disconnect just wanted you to clarify that, if you would be asking about the line side you will get a different answer.

  2. #22
    Join Date
    Feb 2004
    Posts
    174
    Quote Originally Posted by david View Post
    see post #3
    You say you need to tap a 400 amp main service fused disconnect, are you tapping the line or load side of the service disconnect?

    Since you are asking about the tap rule that implies the load side of the service disconnect just wanted you to clarify that, if you would be asking about the line side you will get a different answer.
    I am tapping the load side.

  3. #23
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    25,197
    Quote Originally Posted by hardworker View Post
    I am tapping the load side.
    Tap conductors up to 25' with a minimum of 1/3 the ampacity of the 400 amps. That's it.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •