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  1. D

    Three phases main supply

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

    Old and New three phase board wiring

    Hi All Can I get some advise please. Is it OK to install a new lighting DB with all new lighting circuits wired in all new colours, Brown, Blue and Green/Yellow, all the other boards are in the older colours. Black, Red and Green/Yellow. The question is, the DB is a 3PH & N and the tails have...
  3. S

    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 -...
  4. Amnesh Singh

    Connections of a Three phase Motor STAR and DELTA.

    Amnesh Singh submitted a new resource: Connections of a Three phase Motor STAR and DELTA. - THREE PHASE 400/600 Volt AC Motor STAR and DELTA Connection DIAGRAM Read more about this resource...
  5. J

    Electrician Jobs 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...
  6. Adam_92

    Safe isolation question? For three phase

    hi, I’m wondering if there is a safe isolation sequence obviously first steps are: Ask to isolate Lock off and put up signs keep key safe Then prove leads working on proving unit Do the 10 steps- (do you have to do these in an exact order?) some tell me no and some people say yes Back on...
  7. W

    Understanding electrics three phase.

    Hello just a question if your supplying a three phase motor. Say each phase draws 9amps 1.5mm or definitely 2.5mm2 swa will be sufficient to carry the load for each core but then there will be 27 amps returning on the same neutral so my question is with three phase why is the neutral not sized...
  8. 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...
  9. 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...
  10. G

    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...
  11. 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...
  12. 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...
  13. 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?
  14. polo1

    Three phase sub metering advice

    Hi all, been asked to install sub meters in an office building which is being sub divided and let out as smaller units. The owner/landlord intends to recover power costs fro tenants in each unit. Haven’t been to site yet, but understand the following: - Each smaller unit has its own sub board (...
  15. 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...
  16. 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...
  17. D

    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...
  18. 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 :)
  19. 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...
  20. 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?

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