User Tag List

Results 1 to 5 of 5

Thread: Panel Clearance Q

  1. #1
    Join Date
    May 2014
    Location
    AZ
    Posts
    2,570
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Panel Clearance Q

    I forgot where the code is.

    Commercial 800A 3ph panel dmark clearances.

    I have a wall that has several panels distributing 800A 3ph. I need to extend the wall these panels are already mounted to to make a room around it (galley style room). The panels have doors. What code shows the working area clearances?

    red are the panels, black is existing wall
    blue is new walls to make the room, green is the door

  2. #2
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    27,329
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    What is the blue wall made of and what is the voltage to ground of the distribution panels?
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  3. #3
    Join Date
    May 2014
    Location
    AZ
    Posts
    2,570
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by infinity View Post
    What is the blue wall made of and what is the voltage to ground of the distribution panels?
    Existing wall I believe is 5/8" fire rated sheetrock. Existing and new is all steel stud framing. New walls will be whatever is required. 3ph is 120/208v wye.

  4. #4
    Join Date
    Jul 2003
    Location
    New Jersey
    Posts
    27,329
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Since it's 208Y/120 all three conditions of 110.26(A)(1) would be 3' of depth in front of the panel, that's from the cover to the wall opposite the panel.

    Had it been over 150 volts to ground like in a 480Y/277 volt system then it could have been condition 1 or condition 2 depending on the wall material and that would be either 3' or 3'6" of clearance.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  5. #5
    Join Date
    May 2014
    Location
    AZ
    Posts
    2,570
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by infinity View Post
    Since it's 208Y/120 all three conditions of 110.26(A)(1) would be 3' of depth in front of the panel, that's from the cover to the wall opposite the panel.

    Had it been over 150 volts to ground like in a 480Y/277 volt system then it could have been condition 1 or condition 2 depending on the wall material and that would be either 3' or 3'6" of clearance.
    Thanks, i'll take a gander at 110.26

Posting Permissions

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