3 phase

  1. 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...
  2. Mike Johnson

    Reported content: Post in thread 'UK - 3 phase domestic supply'

    Post in thread 'UK - 3 phase domestic supply' by John-SJW has been reported by Mike Johnson. Reason given: Content being reported:
  3. J

    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
  4. 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...
  5. 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?
  6. 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...
  7. A

    3 phase

    Hi everyone i have recently had a 3 phase supply and board install in a domestic house, this will supply the house which has 12 circuits for light ring mains and ac units etc as well as in the future a 3 phase workshop, single phase workshop, 2 x 1 bed lodges, hot tub, solar panels and electric...
  8. robertl

    UK 3 phase inverter welder from Split Phase / Bi Phase supply 480v

    Hello all, I have discussed my power install before as i am sure a lot of you will remember as it is quite different to a normal setup. I have a split phase / Bi Phase system, 2 phases coming into the workshop from a center tapped transformer. 240v phase to neutral and 480 phase to phase. I have...
  9. A

    Megger 3 phase motor with thermistor

    Hi guys Do you carry out an insulation resistance test on a 3 phase motor with thermistor protection as you would without thermistor protection or does extra caution or process need carrying out differently? First time coming across one Thanks
  10. M

    Convert 3 phase into 3 single phases

    Hi there, I have currently started working on a farm and they are having a new 100a 3 phase supply installed. This is being terminated in an external enclosure. They then want to carry this 3 phase 150 meters to a barn and at this point split it into 3 single phase supplies. Is this even...
  11. L

    Sizing 3 phase Generator

    Hi Everyone May be someone could shed some insight on the sizing and provide some suggestions: 3 phase Generators (400 V, 50 Hz) have the ability to sustain 250% kVA of its rated kVA at 30% voltage dip. Suppose a machine needs to be powered by a standby generator during a power outage. It...
  12. Gavin John Hyde

    3 phase looped service cut out

    Got a customer with a 3 phase looped cut out. Only use one of the phases and there is likely a second fuse on the adjacent holder/phase. I have asked the DNO to take a look and advise as the customer wants an EV charger. With a looped supply you should get dnos advise first. ENA guidance also...
  13. D

    UK 3 phase supply

    Hi All New member on this forum 1st post i need some good sound advice please I am a maintenance electrician and I have been asked to quote for a 3 phase and neutral electrical supply at 125amps per phase for a chiller unit that is to be hired ,to be totally honest I am out of my depth . My...
  14. M

    What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth)

    Hi I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors. I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit...
    • Manjunath
    • Thread
    • 3 phase between earth grounding minimum phase required resistance wire
    • Replies: 5
    • Forum: UK Electrical Forum
  15. robertl

    3 phase 2 speed motor from single phase

    Hello everyone I have just bought a new lathe, (used) its on its way to me from other end of the country now. I have only just realised i may have an issue. The machine is 3 phase and i was intending to go down the VFD route but because its a dual speed motor im not sure i can. See attached...
  16. robertl

    3 phase Rotary Converter Build questions

    Hi All, I am just about ready in my new workshop to buy and start using the 3 phase equipment i will need for my business. The biggest of which will be the press brake rated at 12.5kw max. There will be a few other units but smaller - around the 1 to 3kw rating range, so with that i am looking...
  17. naylorpd

    3 phase RCCB tripped, won't reset

    Hi, in my garage I have a 3 phase RCCB that has tripped and I just can't get it to reset, even with all the downstream MCBs switched off. Bit of a nuisance really as mother in law has no power to her flat above the garage and the garage door and front gate don't work. I tried uploading photo...
  18. E

    3 phase supply to garage cable spec

    Hi - first post, so I hope I get the tone right. I do pay professionals to do the work, but have a technical background and like to understand what's being proposed and why. My house has a 3 phase supply. Everything in the house runs off a single phase. We've just had a 7kW car charging point...
  19. L

    UK 3 phase supply earth concern

    Hi all, Background- I rent commercial premises for a small cabinetmaking business. Lots of 3 phase machines and 240v circuits. The site is on a farm where the main supply enters the landlords unit to a distribution board where it is then split to various rented units. That board looks like...
  20. A

    3 phase gen set neutral/earth

    Hi guys/gals I have been asked to install some 230v sockets and lights in an old refrigerated trailer, that would be used as a store on a quarry site. The trailer has a 3 phase generator built on to the side to originaly work the refrigeration unit, but as everything involved with the...
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