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  1. Rocboni

    AWA submain 400Amp install

    I expressed my concerns on the arrangement before I started to tie them under instruction from the journeyman who was instructed by the manager, however nobody listened. I have seen videos showing how the cables blow apart under fault conditions. Would probably have been quicker to cleat them...
  2. Rocboni

    AWA submain 400Amp install

    I’m not sure What what the Pscc is at the moment I reckon it will be under 50KA submain is protected by a MCCB, that’s what I was wondering, how large does it have to be to need to be fixed with trefoil cleats looks like it's generally over 50Ka Seem like ties were the correct choice as cleats...
  3. Rocboni

    AWA submain 400Amp install

    No takers?
  4. Rocboni

    AWA submain 400Amp install

    hello Just wondering at what level does circulating currents, short circuit current come in to play when installing single cables and how inportant the arrangement of cables on the ladder are, is it mainly high voltage installations or low voltage as well? We are installing a 400A submain...
  5. Rocboni

    Salary of us poor sparks

    Train drivers might get paid £50k but you have to put up with the fact someone might jump in front of you when doing 140mph, it happens quite often!
  6. Rocboni

    S/Y and SWA termination - stupid 25 characters

    There's nothing wrong with earthing both ends as long as the braid is not used as the CPC
  7. Rocboni

    S/Y and SWA termination - stupid 25 characters

    Both ends should be terminated using the correct glands however it is only necessary to earth one end, preferably the supply end.
  8. Rocboni

    45kw motor and generator problem

    Further update on this, MCB was holding fine until the colder nights set in, the MCB began to trip when transitioning to delta due to the oil viscosity, the D type was fitted and there have been no other issues. It's such an unusual load, I was observing the display on the generator at the...
  9. Rocboni

    Apprentices in the old days

    Still happens Pete, my tradesman Jimmy now retired had a black pale for all the bits and bobs, used to dread when he asked you to look for a specific nut, bolt, screw or washer. If you came back and said you couldn't find it, he'd tell you get the dust sheet and tip it out! It's still in the...
  10. Rocboni

    Fire alarm

    All that's going to happen is the door is going to close all the time from false activation, that's why heat detectors are fitted in the first place.
  11. Rocboni

    Fire alarm

    Aico relay base, with magnetic door holdback wired through the NC contact via a 24v psu? Ei128R Hard Wired Relay Module - Aico - https://www.aico.co.uk/product/ei128r-hard-wired-relay-module/ Not sure why you would though?
  12. Rocboni

    Downlights for your own home

    First time I've heard Photonstar being mentioned on here, I use to deal a lot with them, not with downlights but other led products, I've been down to there base in Southampton where they do most of the development, think they have a factory in wales where production takes place. The very early...
  13. Rocboni

    Pete's Videos MI single conductor termination

    Big enough joint box! Self amalgamating tape instead of pots, looks rough but obviously how it's done in Canada or US, like the brass plate though.
  14. Rocboni

    3ph star delta starter motor drawing high amps

    Could a set of the windings be connected to the same phase e.g. U1 and U2 Edit, Andy 1960 already mentioned this.
  15. Rocboni

    3ph star delta starter motor drawing high amps

    It really has to be the delta contactor if running fine in star, proves windings are ok, loosing a phase when delta contactor comes in.
  16. Rocboni

    3ph star delta starter motor drawing high amps

    This is my point, the OP has gathered components off a shelf and assembled to test either that the star delta starter is operational or that the motor is ok, but not every motor can be connected to a star delta motor as you know.
  17. Rocboni

    3ph star delta starter motor drawing high amps

    I understand this Pete but a motor that only draws 3A on start up doesn't need to be connected to a star delta starter to reduce starting current does it? without seeing the rating plate it's obviously small motor
  18. Rocboni

    3ph star delta starter motor drawing high amps

    Why do you need to start it via star delta if you are able to start it DOL, how big is the motor and are the windings rated 415/690 or there abouts? How are you connecting the links when starting DOL I presume star as you say it starts fine when connected up to the star delta. My bets on delta...
  19. Rocboni

    three phase coolant pump

    A young girl was actually caught in a lathe locally at a school, lucky it was not fatal, however she did suffer facial injuries, I think it was her tie which got caught. I'm only taking 5 years ago max when I was at school, there was a global Emg stop system but it simply cut power to all...
  20. Rocboni

    three phase coolant pump

    Most of these lathes don't actually come with Emg operating systems, or mechanical brakes as they are aimed at hobby use. My lathe came from a educational establishment and simply had a low level Emg button installed to drop out the start Contactor, I have a vfd installed now, the Emg button...

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