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  1. 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...
  2. 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...
  3. 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...
  4. C

    Single Phase AC MOTOR stuck

    I am trying to fix a single phase ac motor but need some help. When powered on and put off load, motor humms but doesnt rotate, its sort of magnetically locked because even trying to rotate by hand it very hard to turn (motor was removed from housing and therefore I have stator and rotor...
  5. V

    three phase board separation

    hello everyone, I have a little problem. I've got a three phase board, it has the three phase sauna, one phase lighting and sockets connected to it. The problem i am facing right now. This is a comercial unit. So the problem is that the sauna makes the RCD trip every so often. And the board...
  6. G

    Phase converter

    Hi needing to purchase a single phase to three phase converter to run this motor what would you recommend? Thankyou
  7. 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...
  8. 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...
  9. M

    phase rotation incorrect at origin of install .

    Hi all, What are your views on phase rotation. Whilst doing an eicr for a customer's premises I found that the phase rotation at the origin was anti clockwise . the eicr form is asking for verification of phase sequences , which there is although anticlockwise . What would you do there in the...
  10. U

    How can I connect a three phase manuel change.

    I want to do connection for three different power source in my house. Community solar, Personal solar, and a Generator. They are all single phase. Please help me how to connect it in a three phase change over.
  11. M

    how to make a single phase generator tns

    how to make a single phase generator tns
  12. 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...
  13. 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...
  14. 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...
  15. S

    UK Large single phase motors in the UK

    Why is it that I could easily find a 10HP 220V single-phase motor for sale in the USA but in the UK I nobody has anything larger than 5HP?
  16. H

    208V Single phase wiring from 3 phase 4 wire disconnect

    I work in a location that was once a Machine shop showroom. We have 208/230/480 etc in the building. I need to install a temperature chamber that requires single phase only 208V or 230V supply. I have a 100 amp rated disconnect literally in the exact location this needs to go. I've read for...
  17. Dilwyn

    Can. I run 3 phase motor off single phase 4 wiresABC

    Can I run a 3 phase motor. Off single. Phase 3 Black wires ABC 1 earth wire. Any info. Would be great thank you.
  18. S

    Question regarding eddies currents 3 phase

    I have to supply a 3 phase + neutral circuit but I have to run it through a contactor. The contactor is 3 phase no neutral and will be bushed onto the left side of the board with 2 bushes (one for feed, one for load). The other side of the board is bushed onto some trunking where the load will...
  19. D

    Fuses blow when I put phase and ground wires in contact even when light switch is turned off

    Hello to all, I stumbled upon a strange problem this morning. I wanted to change the light bulb socket in my bathroom, when I noticed that when the ground and phase wires come in contact,the fuse-box trips even though the light switch is turned off. So I took a pen voltage tester and tested all...
  20. Joe9009

    Where to connect power cord to induction single phase motor 240v

    (I would want it to run clockwise) Any guidance would be much appreciated.
  21. D

    Draw a start/stop/retain relay control circuit for a 3 phase drill machine

    Hey, I'm just wonder if I can get some feedback on this drawing that I've made? any feedback will be very appreciated thanks in advance.
  22. CokeCanBrad

    UK Three phase testing PFC

    am i correct in thinking for determining the PFC, you can do a PEFC test aand PSCC test and which ever one is highest you can double and choose to be your PFC also is it true for 3 phase that PSCC Is usually always higher? Ive seen some people croc on to the earth and croc onto the neutral and...
  23. James

    3 phase alternate supply

    I don't normally get involved with domestic work but this job is for a family member so I cant Simpley say no. the house is a large property with a 3 phase 100A supply. I think the earthing is TT but not 100% sure of that yet. customer has bought a 12.5Kva generator to use as a backup supply...
  24. K

    Japanese 3 Phase Wiring

    Hi, I hoping someone can assist me. I’ve taken delivery of a control box from Japan, which is powered by 3 phase at 200v. The wires are red, black, white and green. Any ideas how or if I can wire this to make work in the UK via standard 240v or 110v please?
  25. D

    3Phase wiring into single phase supply

    I'm looking to install a traditional coffee machine which has total power 3300w and the wiring supplied with it is brown L1, black L2, grey L3 & Neutal with earth. How would this need to wired to operate on a single phase 16Amp supply?
  26. W

    Single phase motor reverse rotation

    Brook Crompton Parkinson single phase PD90S (from the 70s) 240v 11A 2850rpm 50hz I'm using it for polishing metal with a tapered spindle adapter and buffing wheels. I've got 2 questions. 1. (This photo was taken with all the wiring in its original position.) I've managed to...
  27. F

    3 phase motor dropping voltage with load.

    I have a 10 HP -230 volt 3 phase hydraulic press brake. I just installed a new 40 HP rotary converter panel with used WEG motor. The problem i am having is the volts going into the press during a load is dropping from 245 to 195-200 volt. Which means i'm loosing power of the hydraulic system...
  28. B

    2 phase supply EICR

    Hi, doing a EICR wanted to know how you guys write up the circuit numbers, say for instance I have a 4 pole RCD and 4 circuits, but I only have 2 phases so the RCD has a neutral L1 and L2 but no L3 Would you write it as L1-2/0 L1/1 L2/1 L1/2 L2/2 Thanks
  29. D

    3 phase to single phase with no VSD

    So basically I’ve got a 3 phase motor that I’d like to use to hook up to my cable stripping machine. The motor was salvaged from an old site and I know it works. I know the easiest way to connect it up to a single phase supply would be to use a VSD but those are expensive. I was wondering if...
  30. M

    Question Regarding a RCD on 3 Phase, with a single phase sub-circuit

    I am installing a micro-brewery in our barn in France; as you can guess that, means that I am a brewer, not an electrician :-) I did 'fess up to being a DIYer when signing on. The brewhouse runs on 3-phase, both for the 12kw heating elements and for the pumps. All use a delta configuration i.e...
  31. udud22

    3 Phase Control Relay

    Hi, I am new to HV Electrical Stuff. I am trying to use a emergency stop button to kill power to BOX A remotely. The wall socket has 3 phase 380V supply without neutral. I want to introduce a control relay between BOX A and Wall socket. The remotely operated cable (20 metres) with Emergency...
  32. R

    UK Three Phase wired machine ohms law calculation

    I have a machine which is wired as 3 phase neutral and earth and is 15.1KW, there are no 415v components and all components are 230v, so effectively it is using 3 single phase circuits, however I have always carried out the circuit breaker calculation based on the 415V potential, I.E> 15120W...
  33. G

    3 phase sub meter running backwards

    Hi Have a client who has a 3 phase sub meter running backwards, Has anybody got any ideas how to resolve this please?
  34. S

    Workshop Q light gauge 220v can a 3 phase 415v connection be made up?

    Hello again and Happy NY all. I have decided to take a small piece of family land and erect a house ( live for a few years) As part of this, i have to do a lot myself, joinery carpentry etc. I have access to a rural farm workshop to conduct all, its dry but the electrical connection is run...
  35. D

    Single phase 240v motor starter & overload with on/off switch wiring?

    Hi, Hoping you all can help me wire up my single phase 240v induction motor. Can someone please explain or even better sketch out where the wires need to go, I have a fair idea already just want some good advice before I continue. Switch is CK-5 10A 250v - SWITCH Thanks in advance!
  36. R

    Three phase or single for new installation?

    Hi all, I've just registered to seek a bit of advice and am sure I'll be looking for lots more help soon. I've just bought a plot of land near Hastings that I'll be building a workshop on for personal hobby use - there's no other building on site. I'll be doing some welding as well as having my...
  37. S

    Help Required please

    Hi Guys I recently came across two single phase supplies down the same four core cable, supplied by two separate breakers is there a reg to back this up?
  38. D

    Single phase board use with 2 phases

    Hello guys new in this forum. In my 19 years as an electrician I've never seen this. Looking for any thoughts on this. Been asked to install a few new circuits In a domestic garage. There is a granny annex on top of this garage also. Supply is 3 phase in to a 3 phase isolator. From there...
  39. G

    What Code for this one?

    What code would you attach to this gem, I gave it C2. These terminals are contained within steel trunking but are also part of a live 3 phase cct. See picture. It is installed as a 100 Amp 3 phase ring with these terminals every few metres. Distribution boards are connected from these terminals...
  40. T

    3 phase design process

    Hi folks, I'm installing a 3-ph 32A 60309 socket and just wanted to double check my design calcs are right... The circuit will be part of a 3-ph sub-board (200A main switch) supplied by our main 3-ph distribution board. The final circuit length is approx 30m. The sub board comprises just...
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