User Tag List

Page 2 of 2 FirstFirst 1 2
Results 11 to 18 of 18

Thread: Parallel outputs of AC disconnects to load-side tap

  1. #11
    Join Date
    Nov 2015
    Location
    US
    Posts
    64
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It wouldn't be 280 amps my mistake still 240amps because max backfeed in gear is 240

    Sent from my SAMSUNG-SM-N920A using Tapatalk

  2. #12
    Join Date
    May 2011
    Posts
    5,433
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Smart $ View Post
    You guys (CA) on 2014 now?
    In 2.5 months. You asked me what code, I told you, and it's not 100% clear where the OPs project is anyway.

  3. #13
    Join Date
    Jun 2006
    Location
    Ohio
    Posts
    21,385
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jaggedben View Post
    In 2.5 months. You asked me what code, I told you, and it's not 100% clear where the OPs project is anyway.
    The location is not 100% clear, but I'm leaning heavily toward CA.

    I asked the question within the context of in-effect CA Code.
    I will have achieved my life's goal if I die with a smile on my face.

  4. #14
    Join Date
    May 2011
    Posts
    5,433
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    FWIW, under the current CA code (2011 NEC equivalent), you just have to ask your AHJ about load side taps. Some may recognize that the current code doesn't adequately address the situation and let you use the 2014 code rules. Some may allow you to load the feeder to 120% per 705.12(D)(2). (That would not be applicable in the OPs case). Others will just say no.

  5. #15
    Join Date
    Sep 2014
    Location
    Nor Cal
    Posts
    25
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jaggedben View Post
    FWIW, under the current CA code (2011 NEC equivalent), you just have to ask your AHJ about load side taps. Some may recognize that the current code doesn't adequately address the situation and let you use the 2014 code rules. Some may allow you to load the feeder to 120% per 705.12(D)(2). (That would not be applicable in the OPs case). Others will just say no.
    Hi guys, sorry for the delay. Long weekend. Anyways, yes, I am in CA (Don't hold it against me).

    To clarify a couple points: We are tapping into 4/0 feeders with piercing connectors.
    -The loads at the other end of the 4/0 feeder are in a panel protected by a 200A main
    -We have to arrange the PV this way to distribute to different meters for (billing/cost purposes?) instead of consolidating it (Don't ask me, I'm not the sales/money guy).
    -My main question was concerning the combining of the AC disco outputs to the tap. As long as the conductors from the discos to the tap are rated for 200A we should be good right?

    It's just a weird setup we've never tried before and is open to interpretation.

  6. #16
    Join Date
    Feb 2005
    Location
    South of Bawstin
    Posts
    1,279
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by deadshort View Post
    -My main question was concerning the combining of the AC disco outputs to the tap. As long as the conductors from the discos to the tap are rated for 200A we should be good right?
    Yes.

  7. #17
    Join Date
    May 2011
    Posts
    5,433
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Your AHJ could say just about anything about this, especially if you're still on the 2011 code. But I think it's a safe installation.

  8. #18
    Join Date
    Nov 2015
    Location
    CA, USA
    Posts
    790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    HiQ inverters combine in an AC junction box, with no OCPD, and then the combined output goes to a common CB in an AC combiner panel. No problem doing it, just size all the conductors correctly. But they do have the OCPD at the AC combiner where you just have a tap. But since you are tapping after the main CB it should count as the supplying OCPD.

    The conductors between each switch and the common tie point are subject to the fault current back feed from the service and from the other inverter, most people don't size for this and just size it for the inverter output. For this system it would be sized for 300A.
    Last edited by pv_n00b; 10-25-16 at 10:34 PM.

Tags for this Thread

Posting Permissions

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