why does my welder trip the breaker?

  1. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    hi I have a boc 190c mig welder single phase. I have just had a new 6mm swa cable wired up to my garage with a 16amp socket fitted for the welder. The problem is I can't run it on full power or it trips the breaker. It was wired to a b16 amp and because that didn't work my electrician fitted a b32 amp and it still trips. Why is this happening? The welder has 8 power settings and it even tripped on the 16amp breaker on setting 7. Setting 7 works fine on the 32amp breaker. Any advice on this subject would be grateful.
     
  2. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    WP_20160408_16_48_31_Rich_LI.jpg This is what i have. The rcbo on the left isn't wired to anything that was initially used for the 16amp socket.
     
  3. MattH

    MattH Member

    Messages:
    3,836
    Location:
    Bristol
    (*editted*)

    C type breaker.
     
    Last edited: Apr 8, 2016
  4. 500e

    500e Always buy fire insurance a flood is hard to start

    Messages:
    4,576
    Location:
    SWest UK
    Second that
     
  5. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    Thanks for the reply's. What is the most amperage of welder that could be used on the 6mm swa cable?
     
  6. daleyd

    daleyd Member

    Messages:
    6,658
    Location:
    Wrexham, North Wales
    It depends on the length of cable and how/where it is run, but it should be pretty substantial and enough to run a decent sized welder off. You'd ideally need a sparky to look at your install for a definitive answer though.

    The idea behind c type breakers is they are able to tolerate higher start up current for longer periods than b type breakers so the initial surge in power up "shouldn't" trip them.
     
  7. dobbslc

    dobbslc Forum Supporter

    Messages:
    5,286
    Location:
    Hertfordshire UK
    No name brand breakers might also be a cause of the tripping.
    They look like skank Wylex copies, I'd get them changed too.
    Is the run to your garage a long one and is that run the 6mm cable you mentioned?
     
  8. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    The 6mm swa cable from the house to the garage is about 20 metres long.
     
  9. Kent

    Kent Member

    Messages:
    10,002
    Location:
    Bowland, Lanacshire,UK
    Sounds like you need a new spark
     
  10. brightspark

    brightspark Member

    Messages:
    29,910
    Location:
    yarm
    what input amperage does it say on the welder data plate. if your leccy had anything about him he would have a clamp on ammeter and show the inrush current and peak hold and that would answer the question in seconds what the problem is
     
    ford34/2 likes this.
  11. Crater Creator

    Crater Creator Member

    Messages:
    444
    Location:
    Aberdeen, Scotland
    My initial thought was it may be tripping on earth fault rather than overcurrent - but it looks like every circuit except the welder has earth fault protection - they are RCBOs but the welder is just an MCB - I think....
    I'm assuming the entire garage supply is earth fault protected at the supply end as well - if not, I would be a bit wary of running the welder without some sort of RCD.
     
    123hotchef likes this.
  12. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    bit of a mish mash of unexplained combinations, I`m guessing this board is fed from the House DB ??? whats the breaker and protection for the SWA cable to the garage?
    Worse, we have a 16amp socket protected with a 32 amp breaker??

    Stan
     
  13. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    The 32 amp breaker is only there because the b16 amp was tripping so should be getting replaced with a c16amp. The garage is on the house consumer unit on a 32amp breaker.
     
  14. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    Will my welder run on a 16amp breaker or do I need a 32amp breaker and change the socket to a 32amp?
     
  15. daleyd

    daleyd Member

    Messages:
    6,658
    Location:
    Wrexham, North Wales
    It "should" run on a 16 amp breaker but maybe not up to max current. There should be a data plate somewhere on the welder that will show the input current, this will confirm what is needed.
     
  16. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    Here is the data plate.
     
    • wp_ss_20160409_0001.png
  17. dobbslc

    dobbslc Forum Supporter

    Messages:
    5,286
    Location:
    Hertfordshire UK
    Looks like it's a 20a supply needed.
     
  18. Fife Member

    Messages:
    47
    Location:
    Scotland fife
    Yeh so I need to get a 32amp socket as well then.
     
  19. Kent

    Kent Member

    Messages:
    10,002
    Location:
    Bowland, Lanacshire,UK
    My shop has a supply taken from the main fuse before the house board
    There is an invite fuse in case of cable overload but it's a big cable and a big fuse
    In the shop a separate breaker board.

    What's with this taking off the house board buisness. I have that out to the other out buildings and it's a darn big faff! I sure wouldn't like the shop wired like that

    Your plant asks for a 20 amp so give it a 20 amp slow

    If your whole shop connects back to 32 amp with say the welder running and another tool plus lights it's going to be constantly tripping surely?
     
  20. WorkshopChris

    WorkshopChris Forum Supporter

    Messages:
    4,903
    Location:
    South East Essex
    I would expect that to run fine on a c16 breaker from a reputable manufacture, unless you are welding continuous production on full power.
     
Advertisements