Search:

Type: Posts; User: Tony S

Page 1 of 8 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    9$$
    Views
    766

    In a similar situation I had one hell of a fight...

    In a similar situation I had one hell of a fight convincing management that cutting power on an emergency stop wasn’t always a good idea. A 50 ton centrifuge in freefall isn’t in a hurry to stop.
    I...
  2. Mounting higher rated breakers nearest the...

    Mounting higher rated breakers nearest the incomer is common place over here despite the busbars being fully rated over their entire length. Trying to convince people to intersperse high and low...
  3. Replies
    28$$
    Views
    1,295

    Done it and got the tee-shirt many times. In my...

    Done it and got the tee-shirt many times. In my 50’s I had to sort out the aftermath of an arc flash incident which hospitalised a colleague. No more live working for the rest of the gang, live...
  4. Replies
    2$$
    Views
    244

    230V Ph→N, -6% to +10% allowable variance. It...

    230V Ph→N, -6% to +10% allowable variance. It should be fine on 120→0→120 but bare in mind, any switches are liable to be SP and not DP.
  5. Replies
    1$$
    Views
    285

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

    To limit the magnitude of ground faults, quite common on MV systems.
  6. Replies
    55$$
    Views
    2,205

    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...
  7. Thread: Bus Bar Rating

    by Tony S
    Replies
    14$$
    Views
    1,050

    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?
  8. Replies
    6$$
    Views
    726

    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...
  9. Replies
    24$$
    Views
    1,071

    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...
  10. Replies
    30$$
    Views
    1,670

    I find that statement rather offensive.

    I find that statement rather offensive.
  11. Replies
    13$$
    Views
    814

    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.
  12. Replies
    30$$
    Views
    1,670

    23005

    23005
  13. Replies
    3$$
    Views
    420

    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...
  14. Replies
    20$$
    Views
    1,475

    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.
  15. Replies
    14$$
    Views
    1,253

    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...
  16. Replies
    20$$
    Views
    1,475

    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.
  17. Replies
    22$$
    Views
    1,218

    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...
  18. Replies
    7$$
    Views
    607

    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...
  19. Thread: High leg delta?

    by Tony S
    Replies
    9$$
    Views
    636

    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.
  20. Thread: High leg delta?

    by Tony S
    Replies
    9$$
    Views
    636

    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...
  21. Thread: High leg delta?

    by Tony S
    Replies
    9$$
    Views
    636

    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...
  22. Replies
    4$$
    Views
    577

    Are you working to NEC or IEC?

    Are you working to NEC or IEC?
  23. Replies
    14$$
    Views
    1,156

    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...
  24. Replies
    14$$
    Views
    1,156

    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.
  25. Replies
    22$$
    Views
    1,483

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

    Prime candidates for this years “Darwin award”.
Results 1 to 25 of 200
Page 1 of 8 1 2 3 4