phases

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  1. 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...
  2. 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...
  3. 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?
  4. 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...
  5. 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...
    • rwgs
    • Thread
    • 3 phase being connection phase phases query split supply
    • Replies: 1
    • Forum: UK Electrical Forum
  6. 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
    • dingledong
    • Thread
    • 3 phase meter neutral phase phases
    • Replies: 28
    • Forum: UK Electrical Forum
  7. 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...
  8. sibbits

    240v heating element connected through 2 phases?

    i was asked to check why a tank heater was not working properly today an came across something im pretty sure is wrong. but was wondering if any of you had any thoughts on the element 240v rated was connected to two phases (one at each teminal ,no neutral) via seperate breakers, i dont know...
  9. C

    110v transformer problem

    Was called to look at a 3phase 400/110v 10KVA transformer on a building site. The workers had been complaining their power tools ran slow. Found 230v on all 3 phases and 400v between all phases. Transformer output was 55v between phases. Healthy transformer on floor above, (which was on same...
    • Crosswire
    • Thread
    • 110v between phase phases problem supply transformer
    • Replies: 16
    • Forum: UK Electrical Forum
  10. T

    Insulation testing results

    Hi, Very new to this forum so excuse any faux pas's. Was wondering if anyone has come across this situation: Was doing some insulation testing as part of our planned maintenance and came across a motor that gave an odd result. Capstan Motor 440V/60Hz, 24kW, Star/Delta configuration. Removed...
  11. S

    Bundled Phases

    Hey guys, Has anyone heard of bundling two phases together at the cut out. A Guy form the energy board was moving the main cut-out and told me they used to do it years ago. Does he mean 2 cores (in the same cable) on the same line incoming form the transformer? Surely you cant put two...
    • Scotford14
    • Thread
    • cable cores heard led phase phases supply
    • Replies: 3
    • Forum: UK Electrical Forum
  12. J

    Separate fuses for 3phase supply

    Hi All, Just trying to double check if there's a reg suggesting a 3phase circuit should have over-current device that disconnects all line conductors at once? Got an old rewireable board supplying 3phase motors with 3 individual fuses. I'm looking at 530.3.1 ................... Can anyone...
  13. M

    Sockets on different phases

    2 sockets on dado trunking within half a metre of each other, would you agree on warning notices for potential 400v?
    • Mark6098
    • Thread
    • agree black course different phases socket sockets
    • Replies: 77
    • Forum: UK Electrical Forum
  14. G

    Do split phase boards exist?

    Living out in the sticks. I have come across old split phase installations a few times and done a little maintenance on them. These installations usually consist of a old 3 rewireable db with only 2 phases used. Well for the first time I have been asked to add some circuits which requires a...
  15. M

    phases through separate openings

    I know you should put all three phases and neutral through the same opening of enclosures and not split them(two in one hole and one and neutral in other). But i can't find the regulation for this.
  16. E

    12kw system over 2 phases

    Hi all, im pricing up a job to fit 2X 6kw systems, (one per phase) now am i better just to use 2x single phase inverters? or 2X 2phase inverters? need to check the loading etc to see what will benifit them best! also, can the be ran through one 3 phase generation meter? thanks in advance...
  17. B

    3 phase to single, and back again...

    Hello. I'm a bit confused with the electrics on an industrial unit I'm leasing. Ideally I'm after 3 phase - there is 3 phase coming into the building (with a 3 phase fuse box), but the previous owners wanted single phase and created a single phase set up from one of the 3 phases. Here's a pic...
  18. B

    Phases In A Server Room

    Been to specup a new install on a Server Room. They are planning on extending the serverroom for more cabinets the problem is the current DB has no more free waysand have been ruled out upgrading the board for more capacity due to shutting thewhole system down. Have been told by the IT geek...
  19. Toby Kuhnert

    2 phases in domestic bungalow??

    Hi Guys, Popped over to a bungalow yesterday that a mate of mine has bought to renovate, asked me to have a look at electrics/what might need doing and I found this... 2 phases (red and yellow) in a bungalow with 2 bedrooms?? bit ott i'm thinking? lol. Although the DNO have only supplied a meter...
  20. N

    Max PSCC 1 phase and 3 Phase

    Hi all. Prospective Short Circut Curret. Now , if you measure the impedance on a installation P to N , and get a reading of 0.21 OHMS , the max current flow between these two points P and N will be 230/0.21 = 1095A.....1KA. Now if you have 3 phases , and each are the same impedance P to N ...
    • NZSPARK
    • Thread
    • 3 phase max phase phases pscc roman times
    • Replies: 8
    • Forum: UK Electrical Forum
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