three

  1. H

    Testing PFC on a three phase board with 100 amp From the meters tails

    I’m currently doing some testing on some site temps I have a three phase trip system the tails from the head go into a 100 amp RCD which feeds a board I’m trying to do a pfc on the db but it comes up with 2 lead high which trips the RCD I tried on 2 lead low however came up with 20 amps which...
  2. M

    Help connecting three way switches

    There is two hot wires one in each box. What is the proper way to connect the four wires to the switch In each box?
  3. E

    Three phase rcd protection

    Hi guys, I am rewiring a commercial launderette with 3 phase machinery. Does the machinery need to be RCD protected being in commando sockets. The sockets are not accessible to the public and each circuit is being used for a specific machine. With the price of three phase rcbos the...
  4. I

    Three phase equipment RCD protection on a TT system

    TT system, existing three phase fuse board recently installed by another spark which only has single phase circuits terminated into individual RCBOs Required to install three phase circuits for new equipment, is there a better way of doing this than fitting a 4pole RCD ahead of the main switch...
  5. jimbobbrad

    UK Old Three phase UPS wasting electricity?

    I'm hoping someone can sanity check or correct my thinking. I have a very old UPS, it's showing a power factor on the front display of 0.1 We put a clamp meter on the 3 incomers which all read 36 Amps. the 3 outgoing legs are showing 12, 6 and 4 Amps That's 108 Amps in and 22 Amps out, I'm...
  6. 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...
  7. 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 .
  8. S

    Safely split ceiling lamp for three bulbs.

    Hey all. New here and new to 3 phase. I had some electric experience on set in Los Angeles as a gaffer for a couple of years, but it was mainly single-phase - counting amps and avoiding blowing circuits type deal. Also did basic wiring in my old 73 chevy truck as well. So nothing huge. But...
  9. S

    Three phase motor ( Power cable faulty phase )

    Hi gentlemen, I have three phase motor has an issue. This motor is star connection. When I just disconnect the power cable coming from MCC through breaker, and did megger test I found the reading as follows: Phase1 with ground = 0.17 MOhm Phase 2 with ground = 250 Mohm Phase 3 with ground =...
  10. 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...
  11. 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...
  12. P

    Three Batteries have Died in 11 Months Alternator Appears OK.

    Vhicle: Fiat Grande Punto 1.2 Petrol. 24/9/2021 The original battery died and was replaced: I'll put that down to old age. It was replaced with a Lion brand 40 AH that I was later told was not the recommeded battery for the vehicle. A month later the Alternator Sized Up and was replaced...
  13. 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...
  14. M

    Three 2.5 t&e feeding a socket and a fused spur

    I'm revamping the kitchen electrics, 1980's property. Majority of the sockets have a couple of cables going in/out of them, with the only exceptions being a couple of sockets tee'd off fused spurs and fed by single cables. However, I'm perplexed by one area. By the side of the gas hob there was...
  15. 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...
  16. D

    I need some help! ASAP, questions a put wire, three ways and stoves.

    This is the digram that i came up with, i am running mostly 12-2, on 20amp for everything. Except for my electric stove, i was planning 6 gauge wire on a 50a. i am trying to wire in two three ways light switches, and was going to run 12-3 between them and 12-2 to the lights and the service...
  17. 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...
  18. A

    UK How to wire three LED to main with one cable?

    Hi all, I am new in this forum and would like to understand how to wire to the main supply x3 of the equipment that I attached as a picture? I had a normal light and wish to have three of those leds instead. Is it possible and if so how should I wire it? Many thanks in advance. Adrianna
  19. Diocm7

    Two eletric meters and three readings.

    Hi there I recently moved to a new flat and it have two different eletric meters. The first one is a regular one and the second one is one for the economy 7 tariff I think sibce it have meters for low and normal. Wouldn't only the second be enough? I attached the photo. Thanks for the help
  20. 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...
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