phases | Page 2

phases

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  1. 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...
  2. 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...
  3. 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...
  4. 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
  5. 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...
  6. 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
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. charlie76

    What are your thoughts on this 3ph domestic.

    The installation on the attached pic is a property with a 3-phase supply and a range of fuse boards. I am currently in training but this is a family friend and I have discussed carrying out a rewire for them once I get my papers. I intend notifying the works to BC and then getting NAPIT in to...
  15. the pict

    DNO connection team

    What is difficult about this, one building formally a pub,hotel, restaurant, with a 3 phase supply, the property at some time in the past ceased being a hotel but remained a pub restaurant, the rooms were converted in to 2 flats and supplied with one phase each from the existing 3 phases, a...
  16. joel89

    Testing ze at the origin

    Hi all I'm an industrial sparky on maintenance doing my eal initial verification exam tomorrow was just wondering when doing ZE at the origin, do you do Neutral L1,L2,L3 and then Earth L1,L2,L3 and N+E ? Or is there between phases too? And is this the same for The PFC?
  17. S

    2 phase dc to ac converter in a 3 phase house

    I am about to buy a Pv Solar system for my house(Grid tied system ), the system is a 10Kwatt system, the company that is going to install it, is quoting me a 2 phase DC converter but my house has a 3 phase transformer, they said that there is no problem, but i am not so sure, any help will we...
  18. R

    splitting 1 phase of 3 phase supply query

    Hi, I need to split a single phase from a 3 phase supply into 2 separate connections. The 3 phases are currently being used by a shop and 2 flats above, with each using 1 phase. We have put a 3rd flat on top, however believe we can split one of the existing phases so the 3rd flat can...
  19. D

    3 phase meter

    A building has 1 3 phase thing in it and 3 fuse boards single phase 1 to each phase but they are going to turn of one board for about a year . How will this affect the readings as in bills How does a 3 phase meter work
  20. P

    100 A MCCB feeding DB with various RCBO's tripping before they do?

    Hi I have a problem on a site that I have inherited. The fault is that a 100A MCCB is tripping indeterminately. The MCCB feeds a DB which has several cct’s none any higher than 32A and all cct’s are RCBO’s the RCBO’s are not tripping yet the MCCB is. The MCCB has been changed recently...

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