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three phase

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  1. Z

    Three phase motor (two speed switch)

    Hi, I am trying to wire a two speed switch to a three phase motor. I have continuity checked the switch in both positions 1 - Low and 2 -High (See attached) Can someone confirm if this is correct and would this change the speed. Secondly i have a cable coming from what is I assume from the delta...
  2. Khanzada

    Load calculations on three phase board

    Costumer have 12 flats and need to feed for each flat a prepaid meter and consumer unit within the flat , the main supply to building is three phase , my question is how to distribute the load for 12 flats, each flat have a load of 63A. Main supply is three phase .
  3. Z

    Wiring diagram for 3 phase contactor start up

    Hi all, I have two three phase sanding machines that both have there own contactor start up. Both work fine. I have connected a dust extractor to them both. That also has its own contactor start up ad works fine. Its also 3 phase. How can I wire the the extractor to be triggered by either...
  4. M-B-Electrical-Services

    UK Client wants a battery back up

    Hi all, I have a regular client who has asked for a battery back up system to be installed at their home. They live in a rural location on a single phase PME supply with a 100A fuse and run a business (internet based) from there too. They suffer from regular power cuts which affect the day to...
  5. B

    220 volt, three phase element

    I have a 3 phase element for a steam generator but the element is a 220 volt element. the diagram is in Chinese which i cant read. on the diagram it shows three phase delta connection for 380v and three phase star connection for 220 volt with a neutral connected to the star point. My question is...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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?
  13. 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...
  14. 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
  15. 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...
  16. G

    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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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