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  1. Law852

    Help installing light to a box with three sets of wires

    So I removed a light without having taken a photo of the set up before and now I'm having a problem reconnecting the light. There are two light switches controlling three lights. There is one switch (switch A) that controls the light coming from the box in question (light A) and a second light...
  2. 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...
  3. 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?
  4. 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...
  5. G

    Middle light of three in a fitting keeps burning out immediately

    Hi all! I have a light fitting with 3 lights on it in a row. The middle one burnt out right away when I connected it. Then I started another thread prior to this one which solved some wiring questions. It's now all connected ok. When I replaced the middle light after all of this was done and I...
  6. 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
  7. W

    Three way light question: how to wire?

    I am having some trouble with replacing a lighting fixture. I have done many throughout the house without issue, but this one is perplexing me. It is a light with two switches. When I took the light down, I was in a hurry but I swear both the black and white wires on the fixture were wired to...
  8. 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...
  9. Electron

    Where can I get parts to repair a customers broken lamp post? Only two of the three lamps work but all are badly corroded.

  10. GBDamo

    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...
  11. S

    Three way light switch does not work correctly

    Hello, A few years ago I had my house rewired before putting up new drywall. I had a three way installed to control the lights in our mudroom, one at the exterior door and one in the kitchen. This is currently not working correctly and I am trying to understand why. The wall box at the...
  12. 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...
  13. HumbleWorker 91RT

    New to the industry starting my evening course in September, what’s the top three things you look for when hiring?

    Hi All, Worked on site and coming from an industrial abseiler role into the electrical industry. Curious to see what the majority of you guys are after when it comes to employees. I’ve been a subbie for the past 8 years and believed myself only as good as my last job and reputation...
  14. A

    high voltage three wire to low voltage 4 wire?

    Can someone explain to me please how a substation converts high voltage three wire to low voltage 4 wire?
  15. 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...
  16. 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...
  17. D

    Hagar rcbo’s in three phase board

    Has anyone had this issue before ? Was working on a three phase board, when I took the cover off I noticed a black spot on one of the rcbo’s. it happened to be smouldering and started to catch a light. I noticed another rcbo smouldering too. I instantly turned off the main switch as one of the...
  18. nyDIYelectric1

    Can one 12/3 wire be split into three (or more) 12/2 wires using pigtails?

    Working on an electrical drawing and wondering if I can split a single 12/3 wire (blue&red together) into three 12/2 wires (2 blue & 1 red separated) using pigtails at an outlet so that the wires can travel in three separate directions as in fig 1? The wires attach in pigtails as represented in...
  19. G

    Thoughts of experts welcome - ancient three phase install?

    Thoughts of experts welcome. The first smart meter installer walked away as he wasn't three-phase qualified but i'm wondering whether we should get Western Power out beforehand or whether any other work would be recommended. Not sure what the supply box on the right is feeding and I think Noah...
  20. P

    Refitting an extraction fan

    Hi, I need to refit a timed extract fan, there are three connections on the fan body, clearly marked, fine with that, but the supply cable from the ceiling is one cable only, one brown and one blue, the bare earth wire was just bent out of the way. It was working fine before disconnection. There...

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