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Type: Posts; User: Tony S

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  1. Replies
    1$$
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    216

    To limit the magnitude of ground faults, quite...

    To limit the magnitude of ground faults, quite common on MV systems.
  2. Replies
    16$$
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    659

    Like others, I don’t understand you’re mistrust...

    Like others, I don’t understand you’re mistrust of electronic trips. In forty plus years I’ve worked on breakers from the 40’s to the present day, I’ve only had two fail.

    One was down to the...
  3. Thread: Bus Bar Rating

    by Tony S
    Replies
    14$$
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    904

    Are these busbars 100% loaded? 8x150A=1200A with...

    Are these busbars 100% loaded? 8x150A=1200A with no diversity. Think about it, is an extra 30A or 2.5% overload going make any difference?
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    6$$
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    558

    A situation I’ve come across many times. Plants...

    A situation I’ve come across many times. Plants with 660V or 550V supply and machines needing 433V or 380V. All star points earthed to the main earth bar and nest. The neutrals for each voltage kept...
  5. Replies
    24$$
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    943

    I was surprised to see that one of the motors is...

    I was surprised to see that one of the motors is a Brook Crompton, a very old UK (Yorkshire) company.

    Every UK electrical apprentice was given a little red pocket book, the BC motor bible. Mine...
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    30$$
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    1,542

    I find that statement rather offensive.

    I find that statement rather offensive.
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    13$$
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    738

    Are you paying the travel expenses? BTW...

    Are you paying the travel expenses?

    BTW English Electric boards are just a bad, safe breaking skills were required.
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    30$$
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    1,542

    23005

    23005
  9. Replies
    3$$
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    388

    These are being peddled in the UK. The problem...

    These are being peddled in the UK. The problem lies with BS7671 where solid state switching for protection is not permitted, there has to be a definitive break.

    As an experiment UKPN (United...
  10. Replies
    20$$
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    1,367

    Buy breathing apparatus before you next enter the...

    Buy breathing apparatus before you next enter the locker-room……………..

    I did 3 to 4 hours a day weight training, I didn’t smell like a bunch of roses after a full work out.
  11. Replies
    14$$
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    1,154

    Do you have access to hot sticks? If you do check...

    Do you have access to hot sticks? If you do check the input to the PT.

    That said the fact a fuse has blown would have me looking for a replacement PT. I will say that in 40 years of working on MV...
  12. Replies
    20$$
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    1,367

    If you’ve ever walked in to a gym locker room...

    If you’ve ever walked in to a gym locker room early in the morning the smell is atrocious. I’d keep the fan running 24/7.
  13. Replies
    22$$
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    1,118

    One of my worries is not a breaker being a bit...

    One of my worries is not a breaker being a bit twitchy in its old age and opening too early but not opening at all. A breaker has sat there for years minding its own business, not troubling anyone...
  14. Replies
    7$$
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    556

    UK multi core cables have two voltage ratings....

    UK multi core cables have two voltage ratings. Industrial cable is usually 600/1000V, 600V Ph→E, 1000V Ph→Ph. Household cable used to be the same until the bean counters got involved, it’s now...
  15. Thread: High leg delta?

    by Tony S
    Replies
    9$$
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    570

    Its not my job so I don't know what the machine...

    Its not my job so I don't know what the machine is for. The guy that asked me about it is back peddling, trying to get out off doing it.
  16. Thread: High leg delta?

    by Tony S
    Replies
    9$$
    Views
    570

    Sorry about my confusion with corner grounded and...

    Sorry about my confusion with corner grounded and high leg, they’re not systems we use this side of the pond. (I’ve never come across them.)

    In conclusion 480V Y connected shouldn’t cause...
  17. Thread: High leg delta?

    by Tony S
    Replies
    9$$
    Views
    570

    High leg delta?

    A friend has asked me about this. A UK company has asked if he could install a supply to a US made machine with corner grounded 480V high leg delta, very unusual for the UK.

    Having thought about...
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    4$$
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    534

    Are you working to NEC or IEC?

    Are you working to NEC or IEC?
  19. Replies
    14$$
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    1,092

    You live and learn, although a bit late now I’m...

    You live and learn, although a bit late now I’m retired.

    One project in particular springs to mind was two transformers each with four 240mm² 4 core cables. The cables were about 600 Ft running...
  20. Replies
    14$$
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    1,092

    How long have these been available? I can think...

    How long have these been available? I can think of several projects I’ve been involved with where they would have been useful.
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    22$$
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    1,400

    A new way of proving a circuit is de-energised:

    Prime candidates for this years “Darwin award”.
  22. Replies
    13$$
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    1,173

    This one? 22882

    This one?

    22882
  23. Replies
    4$$
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    469

    Once you see the aftermath of a MV flashover...

    Once you see the aftermath of a MV flashover you’ll realise why they vent to the back. We had a 50 year old 11kV OCB flashover. Had anyone been at the front they would have been dead. The switchroom...
  24. Replies
    5$$
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    642

    I can see how this could possibly work as a high...

    I can see how this could possibly work as a high leg open delta. What I can’t see is how any code or regulation in the world would allow it. It’s downright bloody dangerous!
  25. Thread: One for JR

    by Tony S
    Replies
    11$$
    Views
    838

    They’re old technology and sadly being lost due...

    They’re old technology and sadly being lost due to servo drives, et al.
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