phases

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  1. Mark42

    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...
  2. G

    Neutral between phases

    I am trying to connect a smart light switch but there is not neutral. Next to the switch there is a socket with a neutral but it is under a different phase. I understand that it is the same neutral for the whole house on all phases, but when I use the other neutral, it short circuits. I checked...
    • gooyster
    • Thread
    • between neutral not uk phases
    • Replies: 6
    • Forum: UK Electrical Forum
  3. C

    3 phase supply to single phases only 2 phases used

    I went to some holiday cottages today, the main supply in was 3 phase however only 2 of the phases were used. The L1, L2 and Neutral cables were wired into a three phase meter, then coming out was L1 and Neutral, L2 and Neutral to create two single phase supplies which were divided off using...
  4. cliffed

    Different phases in offices

    Originally a Sp DB,now 3pDb 400v. The plans have not been altered to suit,so circuits are the same. Would you worry about the rings are on different phases & close to each other.
  5. D

    Three phases main supply

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

    3 phase breaker across 2 phases

    hi all, I posted this in the wrong forum it would seem so im pasting it here where hopefully Im more welcome! This isnt a real life situation, just a question in my head! Can anyone advise me regarding installing a triple pole mcb in a 3 phase board across phases. Simply put, if the next...
  7. K

    3 phase breaker across 2 phases?

    hi all, Can anyone advise me regarding installing a triple pole mcb in a 3 phase board across phases. Simply put, if the next available ways in the board were for example 2L3,3L1,3L2 and placed my breaker here would this be acceptable? This would normally be grey, brown, black. Hence 1 phase...
  8. G

    Can you take 2 phases to a consumer unit?

    Hi, I am training to become and electrician, I have passed my C&G level 2 exams. I am working as an electrical improver. I came across a consumer unit today, which has two main switches and two phases L2 and L3 supplying it. Does this board comply with regs? Can you take 2 phases to a...
  9. R

    How do you measure 3 Phase Supply confirming it is correct as in 400V between phases etc.

    I have my AM2 exam and the question I have is how would you confirm supply polarity? Would you do the following tests:- L1-L2 L1-L3 L2-L3 L1-N L2 - N L3-N L1-E L2- E L3-E doing this you should expect 400V reading? Finally, test Neutral to Earth and expect to be 0 volts. Would the main...
    • RyanF
    • Thread
    • 3 phase between correct measure phase phases supply
    • Replies: 12
    • Forum: UK Electrical Forum
  10. I

    Two phases in one light switch... regulated against?

    just completed an installation condition report on a commercial property... I've come across a situation where there are two phases present in one light switch and not sure how to handle it. Here is the background: Building has been subdivided and present wiring dates to 1980. Previously the...
  11. S

    Phases in dado trunking.

    Hi all and thanks in advance for any replies. I was wondering if whether when having more than one phase inside a dado trunking are you required to mark up the trunking with a 400v marker/label like you would at a multi gang light switch?? Cheers
  12. C

    3 Phase Wire Colours on L1 L2 L3 Single Phases

    Hi all, I am looking at a system that is supplied with a 3 phase supply and into a cabinet. Then external to the cabinet L1 and Neutral feed unit one, L2 and Neutral feed unit two, L3 and Neutral feed unit three. Units one, two and three are at a distance of 50 meters from the cabinet. What...
    • Chris_1969
    • Thread
    • 3 phase colours phase phases regulations single single phase wire
    • Replies: 13
    • Forum: Electrician Forum
  13. E

    2 phases and neutral

    went to look at a job this evening and the supply into the building is 2 phase and neutral. They property is a shop ground floor and a flat on the first floor, one phase for each unit, my guess this is the reason for the two phases, but why not bring in all 3? I haven't come across this before
    • E.E.I
    • Thread
    • cable lines neutral phase phases single
    • Replies: 13
    • Forum: UK Electrical Forum
  14. T

    3 phase pump

    Hi All i have 3 phase pump set on a primary chilled system for which i had a quick look at a few days ago ive given a quote to look at as its not running for love nor money, ive only spent 10 minutes fault finding but something doesn't add up, its 3 phases and earth no neutral, im getting 230v...
  15. Michaelwgroves

    Multiple Occupancy Buildings

    Hi, UKPN are installing a new 200A 3PN supply. Their incoming cable is 95mm. As per the Multiple Occupancy Building recommendation G87 they will only supply the cut out. I now need to supply an isolator and Ryefield (or equivalent). Looking at table 4D1A 70mm cable will cover me for free air...
  16. S

    3 phases at 600 modular !,,

    Hi all, doing an IECR all the lights are via contactors, 2 X lamps on one circuit L1 --- 2 X lamps on another circuit L2 ---- and the permanent feed on another supply L3 --- Would you you fail this installation? would a simple label in the light saying isolate from more than one mcb be...
  17. E

    small building site temp distribution

    I am setting up some temps on a small site consisting of approx 3 110 transformers 2 portacabins offices sitting on top of each other, a portacabin toilet and a portacabin drying room. The supply is a 3 phase DB. Im thinking use 1 phase for the trannys, 1 phase for the offices and the other...
    • Eric M
    • Thread
    • building distribution phase phases site plan small transformers
    • Replies: 14
    • Forum: Commercial Electrical Advice
  18. W

    Domestic three phase with single phase PV - net metering

    Another family member had a number of eco features added to the home when built a few years ago. This included a ground source heat pump, hence the three-phase, and solar PV. I had a look at the setup recently and observed the solar PV is single phase. Furthermore, it is on a phase with one...
    • wtc
    • Thread
    • domestic meter metering phase phases single single phase three three phase
    • Replies: 4
    • Forum: Domestic Electrician Forum
  19. A

    currently 2 phases in venue unable to upgrade to 3 phases

    Hi looking for some advice I am about to start a commercial job in a rural area the venue is being totally renovated it is a 30 bed hotel which is being extended will have 2 bars large function room a large commercial kitchen and a spectate motel in the future. The venue is only supplied on 2...
  20. V

    3 phase motor does not change direction when phases are reversed

    Hi all ok...i was asked to wire a motor for a fan today....3 phase motor...it had its mains lead attached pre wired. when we finished wiring the supply and starter i was surprised to see it was spinning in the wrong direction.......well not that surprised ...the owner got it from ebay from a...

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