User Tag List

Results 1 to 7 of 7

Thread: load calculations and circuit

  1. #1
    Join Date
    Jul 2005
    Posts
    330
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    load calculations and circuit

    If i have 150' of track light to put on load calculation do i just use the linear footage of track 150' x 150VA x 1.25 / 2 = 14063VA for calculation


    If I wanted to power the track lights and my available power is 20a 277v circuit. I would need 14063 / 5540 = 2.5 or 3 circuits??

    does this look correct? or is there something else that would determine how many circuits I would need or not need?

  2. #2
    Join Date
    Jun 2008
    Location
    Dallas, Tx
    Posts
    595
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mannyb View Post
    If i have 150' of track light to put on load calculation do i just use the linear footage of track 150' x 150VA x 1.25 / 2 = 14063VA for calculation


    If I wanted to power the track lights and my available power is 20a 277v circuit. I would need 14063 / 5540 = 2.5 or 3 circuits??

    does this look correct? or is there something else that would determine how many circuits I would need or not need?
    IMHO,
    150' track light = 150/2 = 75

    75 x 150VA x 125%= 14063 VA service load


    Branch Circuit Load depends on layout, actual number of fixtures on the track, and manufacturer specifications.

  3. #3
    Join Date
    Jul 2005
    Posts
    330
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by xformer View Post
    IMHO,
    150' track light = 150/2 = 75

    75 x 150VA x 125%= 14063 VA service load


    Branch Circuit Load depends on layout, actual number of fixtures on the track, and manufacturer specifications.
    OK sounds good. thanks

  4. #4
    Join Date
    Jun 2015
    Location
    NYC, NY
    Posts
    258
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    see 220.43(B). I believe you don't have to calculate the branch circuit based on 150VA. you should use 150 VA for feeder total load size that effects your panel size.

    Sent from my ONEPLUS A6013 using Tapatalk

  5. #5
    Join Date
    Feb 2006
    Location
    Jersey
    Posts
    2,504
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by victor.cherkashi View Post
    see 220.43(B). I believe you don't have to calculate the branch circuit based on 150VA.
    Then how would you calculate the track circuit(s) ?
    " I'm at a crucial part of my painting "...........Monika Danneman

  6. #6
    Join Date
    Jun 2015
    Location
    NYC, NY
    Posts
    258
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ritelec View Post
    Then how would you calculate the track circuit(s) ?
    I just summarize wattage of all fixtures on the track. Or I go by maximum wattage permitted by energy code for the area where track is installed. For most of occupancies it should be less than 1w/sq.ft.

    Sent from my ONEPLUS A6013 using Tapatalk

  7. #7
    Join Date
    Feb 2006
    Location
    Jersey
    Posts
    2,504
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by victor.cherkashi View Post
    I just summarize wattage of all fixtures on the track. Or I go by maximum wattage permitted by energy code for the area where track is installed. For most of occupancies it should be less than 1w/sq.ft.

    Sent from my ONEPLUS A6013 using Tapatalk
    Yes. I see 410.151(B) you can load the track to 100% of the track rating and apparently the branch circuit having a rating not more than that of the track. So.... It sounds like you can make that track as long as you want to make it and load it to its max amperage @ 100%. I don't see it referring back to continuous duty @ 80%. Is it assumed that the load is should be rated to 80% commercially and that's why there's no limitation residentially?
    " I'm at a crucial part of my painting "...........Monika Danneman

Posting Permissions

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