3 phase

  1. J

    3 phase submain showers

    Hi, I'm working in a building which has a three phase supply. There is two electric showers, sockets, water heater and lights going in a toilet block/seating area. For this I'm looking to take a 10mm 4core cable to a submain near the toilet block and running everything from here. The run is...
  2. S

    3 phase EV Charger on 2 phases.

    Hi all, I have a site where the network cable was damaged do DNO has provided 3no. 100 Amp Fuses. 1 Fuse on L1, 2 Fuses on L2. L3 is damaged in the road and not in service. I have looked at onboard charger diagrams of several vehicles. As far as I can make out the "3-phase" capable vehicles have...
  3. mikehenson

    UK 3 Phase Supply

    I have recently become involved with our local church when I became aware that the installation was 3 phase. Looking at the meter I see that phase 1 is using 60%, phase 2 using 48% and phase 3 zero. I was always under the impression that 3 phase supplies should be balanced?
  4. K

    2 x t&e for 3 phase isolator

    Hi All! Came across this yesterday and just wanted to get others opinion. 3 phase isolator wired in 6mm twin and earth x 2, i'm guessing it's not against regs? Obviously not the best way to do it but would anybody pull this on EICR? It's wired in 25mm pvc conduit on 32a breaker, assume they...
  5. Teddy Lop

    FP200 3 phase rating?

    Writing up a sizable EICR, one circuit is utilizing FP200 type cable (don't know the exact brand sorry I know they differ) for a 3 phase condenser, but the only ratings I can find for any softskin cables state single phase AC. Is 3ph AC even permissable?
  6. woodster92

    Help with Reg 551.7.2 Ina >= In + Ig(s) on 3 Phase Supply

    Hello, I'm struggling to understand how to apply Reg 551.7.2 [in particular the formula Ina >= In + Ig(s) ] to the following situation. I hope the attached image is clear enough, it shows an existing 3 Phase Domestic supply with: A) CU1 is a single phase consumer unit serving the main house...
  7. J

    3 phase TPN boards - earthing TT

    Hi guys, starting a new install on a job soon and having a complete mind blank. The supply at the main cut-out is a 3 phase TNCS supply. There is then a 50mm SWA running a considerable distance to a workshop where i will be installing a new TPN board as well as an earth rod to make all the...
  8. timhoward

    32 amp 3 phase socket, 300ma RCD

    I'm interested how you would all approach this one. A 3 phase distribution board on a caravan site, under lock and key. Only warden and manager have access. One of the final circuits is protected by a 32A 3ph MCB and it supplies a 32 amp TPN socket adjacent to the board, the socket having it's...
  9. C

    3 phase dB and eddy currents

    Recently started a retrofit where the 3 phase dB has been fitted with bushes through the galv trunking. The single phase supplies outgoing have been separated and lines pulled through one, neutrals another and the CPCs through the last one. My supervisor says this is ok, as it is a 3 phase db, I...
  10. ALH1976

    Random Voltage Drop from 236v to 120v

    BIG place OK lots of electrical bits. but one on a 3 phase Radial is tripping its RCCB so i check the wiring making sure its tight and it has continuity even trust the RCCB that it trips. All ok but i noticed on phase for a short while it dropped to 120v on my meter.. just Random comes and...
  11. wsoppitt

    remote 3 phase charger install

    hi guys / girls , any advice would be appreciated, So the situation is a domestic property has a 3 phase supply , from the service head we have 3 phase supply to henley blocks , from here there is a 3 phase supply to remote outbuilding and a single phase supply to the house consumer unit ,the...
  12. B

    UK 3 phase rcd protection

    Hi everyone, I have been asked to pull in some new 3 phase supplies for 7 new welders which do not require a neutral connection. The client has specifically asked for them to be plug and play and rcd protected, which is fine as they are under 32amps. I will be running in 5 core swa's for...
  13. 3

    Contactor. Proving dead . 3 phase .

    When working in a control panel. If I needed to replace a 3 phase contactor do I need to carry out a 10point check to prove dead on just the mains isolator. Or do I need to 10point check the mains isolator and then another 10point check on the contactor before removing. Many thanks
  14. K

    3 Phase connections

    Good day to you. I need electrical drawings urgently and hopefully there is someone that can assist me. They are all for electrical trade test. Taking into consideration it's three phase. 1. A 2 Speed starter with selector switch and motor with control circuit 2. A manual 2 speed starter and...
  15. J

    3 phase problem after spark did 5 year safety inspection

    Hi lads 5 year safety inspection the spark put the tails back and later line 2 of the 3 phase blew blowing the box off the wall and taking out the main fuse on the same line into the building can you all just say quickly what you think the spark may have done wrong ? Cheers
  16. W

    UK 3 Phase Smart Meter EDMI ES -30 B Install

    3 Phase Smart Meter EDMI ES -30 B Install I have a question regarding the potential replacement of my existing EON supplied ELSTER A1140 3 phase meter which is currently providing E10 switching times for our all electric home. The house has an old electric storage boiler and the system is...
  17. J

    3 phase meter problem

    Hi there, I built a house with ground source heating 5 years ago and it's a fairly large house so I have 3 phase supply 80 amps per phase. I had a regular meter it was a Elster A1140. I read this every month on the 1st and logged the readings so I have a good idea of my usage patterns. Ground...
  18. S

    3 Phase Distribution Board Dilema

    Hello All So I'm not long out of my college days and unfortunately I didn't have a lot of exposure to three phase and commercial wiring systems. I have a three phase switch fuse Isolator rated at 200Amp supplied by the landlord. I need to split this across two Proteus distribution boards, the...
  19. X

    3 Phase Vacuum On Single Phase Supply

    Absolutely losing my brain here guys What I would like to be able to do is power our 3 phase motor on a single phase supply. Thought I had it all figured out, motor is dual voltage, on 230v its pulls 30amps 8.6kW rating. Nice cheap option was a dps (compared to getting 3 phase installed or a...
  20. X

    UK 3 Phase Motor Star/ Delta phase conversion

    Hi Guys, We have a CNC router which uses single phase for the spindle, stepper motors and control box. This is all wired in and working correctly. However, the CNC also features a vacuum bed, powered by a seperate 3 phase motor. We have no 3 phase in our shop, the motor is labeled as 4kW...
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