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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 8

    Three way switch?

    Hi, I am working on upgrading from two ballasts to one for one of my lights in my new basement (just purchased home). After removing the two ballasts and installing only one I realized that I have two sets of wires. On has a B&W and the other has a W&G. They’re both operated by two different...
  6. MarkRibbands

    Three phases in single domestic kitchen grid box. OK or not?

    I'm fitting a small kitchen in my remote office/workshop with a limited, existing, supply (3 phase/20A MCB on a long 4 x 10mm SWA). I need to think carefully about diversity and load balancing. My proposed solution is to install individual final circuits for every appliance (Small hob, Small...
  7. gazdkw82

    Three phase polarity test

    I have my AM2s coming up and i am a little confused to the live polarity test on a 3 phase circuit. It's the first live test and I dont want to fail on what is a simple test. I know how to perform a live polarity test on a single phase circuit but unsure on the procesure for 3 phase. Is it just...
  8. S

    UK Wiring emergency lights

    Hi Guys, how would you wire three gang two way switch for emergency lights so you have 3 feeds coming to the switch aswell as 3, 3 core and earth going to the light aswell as 3, 3 core and earth being strappers to the others 3 gang two way switch new to electrics so help would be appreciated cheers
  9. Dmouck

    Three way wiring to single pole switch

    I tried to put in a smart switch, which should be simple enough but when I took the plate off I was surprised at what I saw. There are two lights controlled by the switch, but still single pole switch. The feed wire is three way with one hot going to one light and the other hot going to the...
  10. D

    Two post carlift single to three phase

    Has anyone had any history of powering a three phase motor from a single phase supply? Is there a preferred/best way of doing this? i.e.single phase to three phase inverter/VVFD, convertor or using capacitors etc. Not my usual avenue, but I have had the question put to me, so I am trying to get...
  11. T

    smoke alarm wiring.

    went to change three smoke alarms today and found they were wired in 1.5 t&e useing the cpc as the interconect link wire. would you class this as a c1 / c2 i was thinking c1, any thoughts
  12. M

    Using one phase of three phase supply, will rcd work properly?

    I have a property abroad that has just been given a new supply by my local electrician . It has gone from six mm2 single phase supply to 10 mm2 three-phase supply it has a three-phase RCD unit and currently is only using one of three phases The other phases will come into use when the...
  13. B

    All three neutral wires needed for a smart single gang light switch?

    Hi all, I'm wiring one of those smart switches which is a single gang and I have three live wires (x2 com) (x1 L1) and three neutral wires that are currently in a block. The original switch just use live (com and L1). I've wired up the new switch with the live wires but I am trying to attach...
  14. S

    Three phase INDUSTRIAL fuse board recommendation

    Hello I have a small industrial unit with a messy distribution board. It has 100A breaker and around 10 circuits (lights, sockets, air compressor, three phase 16A fuse etc....) Can you recommend a quality new board from Schneider Havell or Hager?
  15. T

    Earthing of Three phase Motor

    Hi recently was on a job carrying out EX inspections on three phase motor at a pharmaceutical plant. The supply cable going to the motors does not have a core for the earth they have used the braid/SWA of the cable for earthing. So entering the three phase motor with EXe cable glands terminating...
  16. SJD

    Single to three phase converter

    One of my customers has a single phase to three phase converter, to power a 3-phase pump. The converter is a rotary type, quite noisy, and recently has been prone to breaking down (three times so far this year). So they are looking for a static or "digital" converter replacement, 230V to 400V...
  17. C

    Three phase - serial connection

    I have two FCU's in the same room. Can these two FCU's (3 phase) be fed from same cable from the panel located in the another room? Is it acceptable as per codes? or do I need to run separate cables?
  18. S

    Commercial Three Phase Power Supplies

    Hi I'm new to the forum & currently still learning the trade, would someone please be able to clear this up for me as I keep getting conflicting information, my understanding of three phase power supplies is, if you have a standard system in place say TPN supply & 3 x main cut out's, fused at...
  19. J

    Bathroom pull switch with three sets of wires conundrum - help required!

    Hello! I’m looking to solve a problem that’s been bugging me for a few days now (and a few fuses!). So the switch broke on my bathroom pull switch and I attempted to replace it which is when the trouble began - there're three sets of wires for a start… IMG-3777 - https://ibb.co/TKs4n1c So...
  20. A

    Noob Three Phase Help

    Hi Everyone, I'm hoping someone might be able to help answer a question which i have long pondered over. Firstly i am not an electrician, please dont hold it against me, i'm just interested to seek answers when there is something i dont quite understand. I work in the event production...
  21. D

    Industrial Three phases main supply

    Where i can find in the regulations that the always has to be L1 - brown L2 - black L3 - grey
  22. SparkySupplier

    For Sale Single Phase & (some) Three Phase Boards & Devices

    Afternoon all, I've had another clear out. I thought I'd offer it up to you guys before I whack it on eBay. I'm ideally looking for an offer on the lot, however i'm happy to take offers to suit what you need. Here's what's available: 1 x Single phase 11 way consumer unit 100 amp incomer -...
  23. J

    Electrician Three Phase Rotary Converter Install with Sockets

    Not a 'commercial' job as such but given that three phase is involved I feel it belongs in this section. In my semi-professional cabinet making workshop I have a 32A consumer unit. For a range of three phase machinery I have acquired a Transwave Rotary Converter (RT4) which requires a 25A...
  24. R

    Lower the voltage of a three phase 220v delta wiring system with auto transformers

    Hi all, I have a three phase 220v delta wiring system but the real voltage is about 240-245V by measuring between the pairs RS, RT, TS. I want to lower it to about 220V so I was thinking to use three auto-transformers 240-220V wired like this: I expect to find 220V between the transformer...
  25. Michael J

    Three Phase overhead supply is it TN C

    While carrying out a EICR I found on first inspection that there were no RCDs installed . When I checked at the Pole Mounted Transformer the Earth & Neutral were connected at the Neutral point. So am I right in concluding it's a TN-C System? The 17th Edition states that RCDs should not be...
  26. GBDamo

    odd one seen today, three FCUs each for a 3KW immersion on one 6mm radial

    As title, Megaflo hot water cylinder has three 3KW immersion elements. Each fed from an FCU in 2.5mm 3093Y flex. On the surface all looked good. Initial testing showed no earth continuity on two of the elements. Closer inspection showed all FCU covers were loose. Further inspection showed...
  27. Daniel Oake

    Three core - Grey is generally neutral

    (Just a quick basic question I could google, but I prefer the forum discussion if anyone's wondering) When installing a feed to something that requires 3 core and earth, why is it we use the grey (as a general rule of thumb) as the neutral (and sleeve blue) instead of the black, I figured black...
  28. F

    Help with installing 3 way switch to control lights on three separate floors

    First and foremost I would like to introduce myself. My name is Faysal and I reside in East London. By profession I am a Operation Manager within the NHS but have a patient to do home electrical DIY project. I picked up basic electrical skills from a young age, tagging along my uncle who was a...
  29. G

    Rear entry three phase board

    Hi, Is it OK to create a rear entry in an eight way three phase BD. A technician friend of mine says he has never seen this done before?
  30. T

    Rosieres oven three flashing lights

    Good evening everyone, Can I pick your brains please? I live in France and have a Rosieres electric oven - model FE 5573 RU. I installed it new 17 years ago and it has been superb. It has now stopped working and shows three flashing lights on the control panel. I have contacted several local...
  31. L

    63A three phase socket

    Good morning, We have a load of approximately 18.5kw ( compressor skid). There is a plan to install a dedicated socket for this machine, the cable route is yet to be finalised and One of the contractors says 16mm2 cable 100A fuse is adequate but this comes from a rule of thumb as opposed to...
  32. nicnic66

    Amtech/trimble single phase three phase headache?

    Amtech will not let me record a single phase D.B from a 3 phase D.B for a sub-mains. It keeps saying in a warning message that the installation is 3 phase and it cannot be recorded as single phase even though it will let me record single phase D.B's individually on the board schedules...
  33. A

    Three Way with Intermediate and Three Wire

    Hi, I'm new here, and really hope for advice... Could anyone kindly put me in right direction. How do I go about connecting the second switch on landing, or what have I done wrong so far (attached image)? Whatever is connected now works a treat. Thanks for your time :)
  34. T

    Interesting three way conversion to two way and swap for time lag.

    If your bored or like a challenge I thought (maybe wrongly) this might be interesting to trainees and maybe others. As the title convert three way switching to two way (Sw 2 + 3) danlers time lag (Master and slave) using switch 2 and 3. Assume you cannot find the junction box. Can it be done...
  35. T

    So how do I get my business name at the top of the page like ergelectrics then

    So I suppose I have to sponsor the forum. But maybe it is not the best place to advertise for electricians an electricians forum?
  36. L

    Three phase socket query

    Hi, We have a three phase 400v socket rated at 63A. It is proposed to use this for a mobile skid. There is an 18.5kw motor and an approximate estimate of current is 34A, the supplier is saying that the socket is not rated high enough as the skid has dual redundancy ( two 18.5kw motors) and as...
  37. D

    Single to three phase converters

    Has anyone had any experience of using these?? Any good?? Got a customer who wants to put a 3 phase 11kw chicken rotisserie into a shop with only a single phase consumer unit and doesn't want to spend 10 grand on getting a new supply.
  38. L

    Single Phase Load Estimate to Three Phase Power Supply

    Hi Everyone I would be glad if you could clarify this for me: For a Load Estimate Survey whereby 95% is single phase, the Load Estimate is 90 KVA (Single Phase). However, the power supply is three phase 4 wire system. To calculate the current per phase, the 90 kVA is divided by three i.e. 30...
  39. G

    Single Phase Charger on Three Phase Supply

    Hi all, been a bit of a lurker of the forums here for a while and so far they have saved me more times than I can say, but now I have a question that I am hoping you can help me with. I have a single phase forklift charger and it currently has a 2p+e plug and connects to the corresponding...
  40. J

    Domestic three phase? advice

    Hi I have recently moved into a small newly renovated (inc electrics) cottage and noticed appliances going really slow. Kettle taking an age to boil, toaster taking a long time, hair clippers going slow... you get the picture. UK power networks sent an engineer that changed the overhead power...
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