Results 1 to 5 of 5

Thread: ac overcurrent device

  1. #1
    Join Date
    Feb 2017
    Location
    Maine
    Posts
    75

    ac overcurrent device

    Hi

    Just to be sure. Do I need in AC side (solaredge system) the overcurrent device rating---> Inverters amp*1.25? This rule is clear in conductors.

    I was reeding again NEC code...
    Attached Images Attached Images  

  2. #2
    Join Date
    May 2013
    Location
    Massachusetts
    Posts
    2,278
    Quote Originally Posted by jjavier View Post
    Hi

    Just to be sure. Do I need in AC side (solaredge system) the overcurrent device rating---> Inverters amp*1.25? This rule is clear in conductors.

    I was reeding again NEC code...
    Yes. The 125% factor applies for all inverter output OCPDs, unless the OCPD and all within its enclosure are otherwise listed as continuous duty (which is uncommon).

  3. #3
    Join Date
    Feb 2017
    Location
    Maine
    Posts
    75

    240.6

    Quote Originally Posted by Carultch View Post
    Yes. The 125% factor applies for all inverter output OCPDs, unless the OCPD and all within its enclosure are otherwise listed as continuous duty (which is uncommon).
    I understand that there is a 3rd option of a adjustable CB that is my situation. If we have an adjustable CB, that meets 240.6, we just need the nominal amp rating (without *1.25), don´t we?
    Attached Images Attached Images  

  4. #4
    Join Date
    May 2013
    Location
    Massachusetts
    Posts
    2,278
    Quote Originally Posted by jjavier View Post
    I understand that there is a 3rd option of a adjustable CB that is my situation. If we have an adjustable CB, that meets 240.6, we just need the nominal amp rating (without *1.25), don´t we?
    If you have an adjustible trip breaker, it is still 1.25*I_continuous that sizes your breaker trip setting. Unless the unit is otherwise listed and labeled continuous duty.

  5. #5
    Join Date
    Apr 2017
    Location
    Cedar City Hospital
    Posts
    20
    Yes you can go 100% on an adjustable breaker because they are 100% rated but be careful. Depending on what style of breaker it is they are generally about double the price. We just quoted some breakers for a I-line Square D panel and the normal breaker was $4000 and the adjustable was $7000. I'm sure you won't see prices this high but the point is be prepared to pay significantly more for the adjustable opposed to the 125% sized breaker.

Posting Permissions

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