three phase

  1. N

    Merge 2 three phase DNO supplies

    Hi all, I was wondering if you could help me a sort out the problem. Is there any way (or device) to merge 2 three phase electrical supplies? We have 3x100A from DNO and getting 3x200A additional. Is it possible to do that without involving DNO ? The power is for new build 28 flats, we have...
  2. Asmdeus

    Workshop electrical wiring upgrade advice

    Hi Everyone, I have recently purchased a spot welder- Celette Scorpion 2400R. Plugged it into my three phases and it blew fuses(3x20A) with the first weld attempt. Changed old fuses like for like with new ones and tried the machine on the lowest setting, then upped it, and fuses were blown once...
  3. Peter55

    Earthing question - three phase into main building, then single phase to EV charger

    Hi there, new to the forum and in final stages of completing C&G level 3; need to complete design project to complete. Am struggling to get my head around how to draw up correct circuit diagram showing EF Loop path for EV charger where initial supply is described as 'three phase TNCS' feeding to...
  4. N

    Bringing single phase off three phase board

    Hi all, new to this thread and just looking for some views. I have today attended a industrial unit which is being converted into small individual offices. An electrician has previously been here and has taken 3 individual sub mains from the existing three phase consumer unit to single consumer...
  5. Spinball

    UK Do I need three phase or not? Your advice appreciated.

    Hello folks. I am about to complete on a (detached) house purchase and I want to ask your advice whether to have three phase connected to the house and possibly whether I can have it connected for free. I plan to have two Zappy EV chargers installed with them both charging at the same time...
  6. D

    Three Phase Power supply

    Greetings I work for a client who has recently negotiated a bigger supply from the supply authority, the client has agreed with Scottish power to have a larger transformer and feeder cable installed, my part of the works is to upgrade the existing switchgear to accomodate for the new supply...
  7. BiddeldyBwah

    32a three phase isolator neutral bar?

    Came across one of these today at work. Had L1 L2 L3 and switched Neutral, but also had an N link bar inside. Just wondering what it's for?
  8. E

    Winding resistance tolerances in three phase motors

    Hi guys, Is there a standard tolerance percentage that should be followed when checking the winding resistance of each coil on a three phase electrical motor? The general rule of thumb I followed when measuring winding resistance was that each phase winding had to be identical or close to...
  9. A

    How three phase is used as two phase here?!

    Hi everyone, I am having trouble in understanding following schematic. How only two phase are used for load and what happened to third phase here. TIA
  10. Z

    Three phase motor help

    Hello all, I recently was asked to quote a three phase motor install within a pallet factory. To be honest, I was somewhat stumped in how to attack it as the sheer size and the control cabinet was gigantic. Although I'm mainly a domestic, commercial spark, this was somewhat out of my league. The...
  11. GBDamo

    Three phase Type A RCD confusion.

    Was testing a EV charge point today and noticed the internal RCD was TP device with only a single phase supply and load in use (L1). There was 245V either side of the RCD but the test button didn't function.!! Is it possible the test button is fed from one of the phases that is not used...
  12. J

    UK 3 Phase RCD?

    I have recently started on a site where there is a 16A 3 phase Atex socket which is supplied by a 16A 3 phase MCB. It was picked up on a recent inspection that it needs an RCD. For the life of me I cannot find a 16A 3 phase RCD. I started to think does it really need an RCD? The socket is only...
  13. Mark42

    Multiple control stations for one three phase compressor. Best practice?

    I'm refurbishing my own workshops and fitting a new central three phase compressor and three phase dust extractor. Both these appliances will be controlled by remote START/STOP switches, next to multiple compressed air and vacuum points, which may be in different buildings. For future-proofing...
  14. R

    Operation of a three phase UPS

    So looking at a system that utilises a couple of sizable UPS unit to supply various equipment through a site. The UPS is static with 3 phase output, both units have an input switchboard and output switchboard with a castell interlock so that the bypass can not be switched in unless the UPs...
  15. Mark42

    32A single phase output from 3 x 16A three phase supply. Is there a way?

    I have a workshop in a remote location which I rent out. The incoming supply is 3 x 16A three phase on 180m of 16mm SWA. An upcoming customer has a machine which needs a 32A single phase supply. (Actual load about 25A.) The energy is there, but it's split across the three phases. Is there some...
  16. D

    Hagar rcbo’s in three phase board

    Has anyone had this issue before ? Was working on a three phase board, when I took the cover off I noticed a black spot on one of the rcbo’s. it happened to be smouldering and started to catch a light. I noticed another rcbo smouldering too. I instantly turned off the main switch as one of the...
  17. G

    Thoughts of experts welcome - ancient three phase install?

    Thoughts of experts welcome. The first smart meter installer walked away as he wasn't three-phase qualified but i'm wondering whether we should get Western Power out beforehand or whether any other work would be recommended. Not sure what the supply box on the right is feeding and I think Noah...
  18. E

    How easy is it to convert a house from single to three phase ?

    I am thinking of having a car lift (that uses three phase supply) installed in my house, my house is single phase, what are my options?, what would be involved?
  19. 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...
  20. S

    Wiring a 2.2kw compressor

    Hi guys, Been asked to wire in a compressor to a mates small unit. It’s 3phase 415v 2.2kw. There was previously a compressor installed... and what I have in place from the board is - 40A MCB with a 20m run of 4mm 4 core + earth SWA, to a non protected 32A isolator switch mounted on the wall...

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