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  1. Vortigern

    Bit of a mystery to me, any ideas? Fault on three phase Merlin Gerin

    Outage of main three phase primary switch box for one of three buildings on commercial site. The building houses around 30 commercial units. Switched back on the main switch, power restored. Except for one unit. All units supplied through the secondary sub switch box. Large MCCB MEM type. Three...
  2. P

    What do I need to know to calculate size of single phase motor?

    About 20 years ago I bought an old table saw from a local school. I only had single phase at the time so I changed the motor and switchgear as it was 450V. I'm thinking of buying a 3 phase 50s bandsaw and have the same problem, but I can't remember how to work out the size of the replacement...
  3. HappyHippyDad

    Is this single phase as well as 3 phase and what is it's power rating?

    Evening all.. A friend/customer has just asked if I could connect up this commercial washing machine down at his domestic stables. He has had it in his house for 10 years. Recently it has started tripping the B40 MCB. It does not trip immediately so I don't think it is the inrush, plus it did...
  4. lloydy304

    3 Phase 4 wire

    Hi, quick question about 3 phase 4 wire systems. If I was wiring a single TP+N board all circuits running 230v very and well balanced and had a max load of 234A / 3 = 78A per phase. So removing all correction factors and sizing the connection tails a wire size of 16mm br/bl/gr/bl should be...
  5. R

    CamLock Box install - 3 Phase

    I am needing to install a CamLock power box to provide power to some equipment. Located in a commercial office building. The equipment is a robotic arm that requires 208V, 3 Phase Power, 30 Amps max. It comes with a controller and transformer. The overall power flow is as follows: Building >...
  6. D

    Concern re 3 Phase imbalance

    Could you please assist an end-user with limited knowledge:- The system we installed in our new-build is 7.83 Kw of PV with a 'Solax X3' 3 Phase inverter. A later addition was a Tesla Powerwall 2 with the later gateway. Following a series of short (2min) power cuts and lights flickering UKPN...
  7. D

    Can you use a single phase motor to create three phase power.

    This might sound like a stupid question so apologies in advance. So I had a random thought in my head. So I was wondering if I was to use a single phase motor to spin a three phase generator to create three phase power, would you be able to create more power then the single phase motor is...
    • David345
    • Thread
    • create electricity energy energy efficiency generator motor phase power power generation renewable renewable energy single single phase three three phase
    • Replies: 15
    • Forum: UK Electrical Forum
  8. M

    Can I Just replace a 3phase motor with a single phase on my lathe?

    I have a metal lathe, 1.5hp, 3phase, 575v motor. Can I just replace the motor with a single phase,220v motor? Would all the lathe wiring , switches, relays work? IF so, what HP motor should I buy? Thanks,
  9. B

    Seimec 3 phase motor plate shows wiring for 240v? Can I have 1 phase out of it?

  10. J

    UK Three phase (No neutral ) EFLI testing on an RCBO

    Hi I have a MFT1553 Mega tester. Is there a feature on the tester to test 3phase RCBOs when there’s no neutral present? Pretty sure mot. Was wondering if i could temporarily connect a neutral on a Wander lead and use the three wire test method? Thanks John
  11. J

    Looking for recommended voltage tester with phase rotation test on it

    Hi Am looking for the above, with bag and tester confirmation box. Any recommendations please as there are a lot to choose from. Thank you. John
  12. D

    I need help with how inductance works in a single phase transformer

    I currently have this, Primary inductance on an AC transformer will determine the magnetizing current on the unit. Usually inductance is relatively high so the magnetizing current can be as equally low. This inductance can be seen as part of the magnetizing current; however, it will not be seen...
  13. H

    Can you use this 3 phase device on single phase

    Hi there I purchased goods to build a sauna back before Christmas and only now am I getting around to doing it. I was just looking at the heater controller and noticed they they’ve sold me a unit that says it is for a 3 phase/400v supply. I did make clear I only had single phase as many...
  14. F

    No isolation of Neutral in Single phase boards

    As title. Doing an EICR, have come across a couple of DBs, where the neutral goes straight onto the bar on Single phase boards. Whats your views on this guys? Should it have a requirement to be isolated? Is there a reg for? If so then it can be coded. My boss thinks its dangerous. I don't, but...
  15. J

    UK 3 phase domestic supply

    I watched this vid on Youtube. Interesting. They have 3 phase supplies. Does anyone know the cost of upgrading from a single to a 3 phase domestic supply? View: https://www.youtube.com/watch?v=uI7wxNtrorQ&lc=UgyPTN2d89tBByfm4Dx4AaABAg.9CrcYe7x50b9CsC6DnPJKw
  16. midsomerdave

    Motor wiring. 1 or 3 phase?

    Hello all. I have a problem that I'm sure someone can help with. The electric motor I have (pics attached) has no ratings plate. There are no supply wires shown, just the internal connection box wiring. The picture of the wiring diagram looks to be single phase but the box wiring has me...
  17. O

    UK Single or Three Phase Identification (Vehicle Lift Content)

    Good morning all, I’m afraid that I’ve come here looking for some advice with a problem I have with some vehicle lifts that I have been asked to dispose of. I have listed them for sale, but I am not sure how to determine whether they have single, or three phase motors. I am now aware that any...
  18. A

    choosing cable voltage rating

    Hi, for a single phase LV installation, how do you determine whether to use 450V/750V or 0.6/1kV cable. Thanks
    • andrel
    • Thread
    • ausie elec cable installation phase rating single single phase voltage whether
    • Replies: 5
    • Forum: Australia
  19. J

    3 phase distribution board

    I’ve got an old DB at work that I’ve had a look at and can see they’ve used the main earth into it and tied it to the neutral connection at the board is this correct?
  20. Mark42

    Does a 3 Phase socket supplying a Portacabin's 30mA-protected DB still need its own RCD protection?

    This month I'm building a remote lab for specialist chemistry work, in a self-contained 'Portacabin' type building. The cabin will have a new, Hager 3 phase board, with an 30mA RCCD main switch. It's only a single small room so I'm not bothered about the possibility of the whole installation...

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