phase

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  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. A

    How to ensure correct phase rotation on generator

    Hi all, Might seem like a silly question, but I have a client who wishes to install a 3 phase generator to back up the supply of an office building. The client approached me and said before the job commences, he wanted to establish if the phase rotation of the generator would match the phase...
  3. 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...
  4. 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?
  5. 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...
  6. B

    7.5kW single phase soft start

    Customer has a single phase 7.5kW motor running a blower for a grain lift and the 50 years old soft start is no more. Can someone recommend a replacement?
  7. Hyperloaf

    Convert kiln from 415 triple phase to 240v

    Hi, this is my first post on any forum so please excuse any naivety.... I am a DIYer with some experience of doing home electrics but no great depth of knowledge. I just obtained a Podmore and Sons 7.5kw kiln (model 3426) which I would guess is more than 50 yrs old, for which there is...
  8. M

    UK Three phase supply into single phase board

    Hi I popped round to quote for ‘ finishing ‘ a solar install started by a company rhyming with Bird of Polar . The house has a three phase supply, but it looks like someone has taken the three live tails into board not designed for three phase (albeit with a three pole switch). They’ve only...
  9. F

    Single phase spur from Three phase isolator.

    Morning all, Little advice regarding whether spuring from a Three phase isolator to a single phase FCU is allowed? I need to wire a Single phase FCU which is located right next to a 16A TP isolator to a high speed door. Obviously, It would be a lot less pain to wire straight from the TP...
  10. T

    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?
  11. 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...
  12. 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...
  13. B

    AC servo motor burning out 1 phase (motor side) but ok VFD side

    Hi all, First post, so not sure how this will work out… I’ve currently got a 3 phase AC servo motor (Lenze brand) at work that seems to be overloading 1 phase (U phase of motor)… This motor is VFD driven by again a Lenze brand 9300. The load for the motor is a coupling driven pressure roller...
  14. 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...
  15. S

    Single Phase Puzzle to challenge you

    Hi I have inherited a compressor with a single phase motor but its been stripped and I need to fathom out what's what.. I don't know if it even works as why did they take it apart and if its broken what's wrong! I have a start and a running capacitor A reset switch Simple push button Two...
  16. 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...
  17. 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...
  18. S

    Why I get only one phase reading current while rest are zero

    Hi I have UPS 50KVA and the inverter output AC voltage is feeding a distribution panel 120/208 V 4 wires when I check UPS display it shows me that output current which is the distribution panel phases as followings phase one = 30A while Phase 2 = 0A and phase 3 = 0A is this a problem !? Shall...
  19. 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...
  20. G

    single phase compressor motor

    Hi, I am looking for a connection diagram or sugestions for a 2.2Kw single phase motor to drive a compressor. The spec plate shows that it can be run at 220-240 v / 460-480v 50Hz. (unusual for 50Hz) At 220-240 volts FLc is 16A plus startup inrush. so I should like to run it at the higher voltage...
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