phases | Page 3

phases

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

    2 Phase PV Problem with RCDs

    I have just installed a 2 phase system with 2 Solar Edge inverters (3.7kW per phase) Each pv system is fed through a shared Elster A1100 3 phase meter and each one runs fine on its own. When connected at the same time the RCDs on both system trip. The only way I can make it work is to bypass the...
  15. Floody

    400v 3 phase questions

    Hi guys, got a few questions about 400v 3 phase installations. I'm currently working as a mate with a firm who have had a contract re-wiring Boots stores. The installation is 400v 3 phase. I don't think I've done anything on 400v volts before, can anyone give me a quick rundown of how it's...
  16. J

    Different phases for a 13A socket outlet and 5A socket outlet 2" apart

    Hi all. We're currently wiring a large domestic dwelling that has a 3 phase supply. We would like to balance phases as accurately as possible, but due to the lighting control system we have a situation where we have a 13A socket on one phase sited next to a 5A socket on another phase. These...
  17. G

    Shut off 3 phase supply

    I need a solution for a problem I have, just cant seem to think at the moment. I need to shut off a 3 phase supply when a supply to one phase has failed? Now I am thinking 4 pole contactor, but I am not sure of how to monitor the 3 individual phases on 1 control circuit? 3 control circuits perhaps?
  18. G

    Standby generator

    We have some work to do at a large house in the countryside,that has a two phase supply installed .There is a standby generator being fitted next week,which requires conversion from three phase into two phase,by the generator suppliers.Does anyone know if we need two neutral cables to feed the...
  19. H

    Correct warning signs for high voltage (potential belt off 2 phases) please help!!!

    Anyone with experience of this or an idea please help. I have 2 phases going going into a cab, each one 230v. However there is a real chance someone could touch the two and get a belt from each phase at the same time. What would be the correct type of warning sign to use? Also out of...
  20. P

    Will 2 out of 3 Phases Trip a 3 Phase Breaker?

    Hello, We've had an issue with a 3 phase piece of equipment that was tripping the 3 phase breaker as soon as it was turned on. On investigation (by a certified electrician) he said it was the equipment at fault. I raised a return of the equipment and the new one arrived today. To be able to...

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