Results 1 to 2 of 2

Thread: CB and Wire gauge question

  1. #1
    New Member
    Join Date
    Jul 2021
    Location
    Durban
    Posts
    1
    Thanks
    0
    Thanked 0 Times in 0 Posts

    CB and Wire gauge question

    Good Day,

    Please can someone advise on a question i have about CB and Cable size.

    Im taking a power feed from my main switch (2P 63Amp) to my 5KwH inverter AC input . The inverter AC input cable requirement is 4mm however I went 6mm (47Amp rating).

    My question :

    since the main switch (2p 63Amp) has 16mm cable , can I take a feed from the main switch (2p 63Amp) using 16mm cable to feed a 2P 40Amp breaker and connect my 6mm AC Inverter Input cable? This would mean my inverter AC input 6mm cable will remain safe from any over current .


    Regards
    Denzel

  2. #2
    Diamond Member AndyD's Avatar
    Join Date
    Jan 2010
    Location
    Cape Town
    Posts
    4,923
    Thanks
    576
    Thanked 934 Times in 755 Posts
    Generally a wire or cable should be supplied by an appropriate sized upstream circuit breaker ie if you connect to a 60A breaker it should be a 16mm wire/cable or larger. Using the main breaker as the sole means to protect a final circuit is bad practice, the circuit should have it's own circuit breaker.
    _______________________________________________

    _______________________________________________

Similar Threads

  1. 3 wire transformer
    By ians in forum Electrical Contracting Industry Forum
    Replies: 2
    Last Post: 15-Oct-20, 11:14 AM
  2. Wire size
    By Gtfast in forum Electrical Contracting Industry Forum
    Replies: 6
    Last Post: 28-Feb-20, 12:54 PM
  3. Stove wire question
    By Leono in forum General Business Forum
    Replies: 3
    Last Post: 10-Jan-18, 09:20 AM
  4. GP wire
    By Pieter00 in forum Electrical Contracting Industry Forum
    Replies: 4
    Last Post: 26-May-17, 05:10 AM
  5. No earth wire!
    By Dave A in forum Electrical Contracting Industry Forum
    Replies: 27
    Last Post: 02-Jan-16, 08:47 PM

Tags for this Thread

Did you like this article? Share it with your favourite social network.

Did you like this article? Share it with your favourite social network.

Posting Permissions

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