3-phase

  1. S

    Question regarding high Zs on 3-phase motor circuit using BS88 fuses

    Industrial installation (non-domestic). Here's the scenario: A large (150kW) 3-phase motor circuit where the supply is taken from a starter fitted with 315A BS88 HRC fuses. From calculation using the cable data, the Zs value exceeds the manufacturers requirement for 5s disconnection time...
  2. D

    Is it 3-phase?

    Chaps, can you tell me if the supply head in the picture attached is three phase? Thanks!
    • DomB
    • Thread
    • 3-phase aus
    • Replies: 12
    • Forum: Australia
  3. R

    3-phase thyristor control

    I want to try and replace the standard relays on our holding pots that are being kept hot by elements. I want to use thyristors instead, but i'm not sure what the best way would be. I would like to implement zero crossing control. So when 1 is fired in the forward dirction, 2 and 3 should be 1/3...
  4. W

    No 3-Phase Connection - Building Overcapacity!

    Couple of weeks ago I signed a lease on an industrial unit (all 25 units in the building are 'wired for 3-phase'). Although the unit had a single phase CU the wiring was there for 3Ph. Spent the last week installing a 24way DB, sockets, isolators etc. etc. etc., got it all checked and...
  5. D

    3-phase calc

    quick question: a 3-phase lift rated at 2.2kw 6.4 amp doesn't seem to add up for me?
  6. F

    3-Phase 415V supply. How many circuits?!?

    Hi! I have recently changed my job and my employer has asked me to survey the existing electrical system. The main incomer is 100A 415V 3-phase and neutral and each phase and neutral is attached to a separate CU. This is how is breaks down:- L1+N= (100A CU) Handdriers in toilets, lighting...
  7. sparks1234

    3-phase

    If you are running a single phase board in a commercial premesis, its the only board in the place, but the incomer is 3-phase with a 3-phase meter but only single phase leaving the meter, would you still double the KA?
  8. P

    Single & 3-Phase Voltage in The UK

    Hi all, Just a quick question on single phase and 3-phase voltage. Do The UK use 240V Single Phase and 415V 3-Phase?
  9. B

    3-phase to 1 phase?

    I've got a boat, and often connect to shore-power using a 230V IEC blue 16A plug like this: A lot of places now have IEC sockets that take a 415V 3P+E red plug like this: Can you get a converter, I'm guessing it would be a transformer?
  10. M

    Cannot get 3-phase - problem?

    I have the following: Extension Ring 32A Up Ring 1 32A Up Ring 2 32A Down Ring 1 32A Down Ring 2 32A Kitchen 1 Ring 32A Kitchen 2 Ring 32A cooker 1 32A Cooker 2 32A Shower 16A Up Lights 1 6A Up Lights 2 6A Up lights 3 6A Down Lights 1 6A Down Lights 2 6A Down Lights 3 6A Smoke...
  11. S

    Meggering of 3-phase Synchonous Generator

    For phase to phase Meggering of 3-phase Synchonous Generator, we have to open its flexible links (between phases) & its star point. We then connect Megger's positive lead to phase (which we want to Megger) & we short remaining two phases with ground?(& connect megger's negative lead to it) Why...
  12. W

    3-phase wiring at home

    Hi guys, I've just been given a date for EDF to come and connect 3-phase supply to my garage at home (I'm starting my own business and unfortunately the control cabinet I'm designing needs 415v 3p, so to hold off renting a unit I thought I'd power-up and test the machine at home). I've sourced...
  13. C

    3-Phase Generator Question

    Hi all, Got an interesting generator related issue here………………. I’m currently helping a friend with a 100KVA geni and I’m after some advice. I’m trying to work out what the maximum current draw would be………….. So if O\P Amps = KVA / (O\P Volt / 1000) = 100/(240/1000) = 416.66 Amps But as...
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