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  1. R

    Increasing Zs through 3-phase mccb on single phase line

    I have a single-phase supply running through a 3-pole mccb, Siemens Sirius 3RV2011-0KA10 The mains goes in on 1 out on 2 linked to 4 then out on 3 linked to 5 and out on 6, not conventional but this is the way the company wires them I have a very high Zs on the outgoing side of the breaker...
  2. D

    UK Problem with EDF not recognising 3 phase in commercial unit

    Hello all. I leased a 2500 sq ft commercial building about 4 years ago that required substantial upgrades. It was previously divided into three different businesses, each with its own meter. The building was completely renovated, and 10 air conditioning units were installed. Prior to this...
  3. S

    Repairing an Elektra Beckum Single Phase Motor

    Hello Forum, You're my last hope and not wanting to be beaten by a DIY project! I bought an old compressor as "spares or repairs" so I know what I was getting into. The unit is over 40 years old, stopped manufacturing in 2000 and no spares available from Elektra Beckum in Germany. The motor was...
  4. O

    3/4 pole rotary isolator on single phase.

    I was reading a thread on a different forum about someone asking how to wire the above, he was going to put the incoming into the top contacts and the outgoing into the bottom contacts leaving the middle pole free. I thought well that sounds fine but it reminded me of how I've seen them wired in...
  5. C

    3 Phase Converters For 3 Phase Consumer

    Hey, Just looking for a bit of advice for 3-phase converters. Regular client has asked for a single to 3 phase converter to be able to power a portable containers with 3 phase boards (currently other than using a 3phase generator on other sites, a single to 3 phase plug top is used and powered...
  6. I

    Three Phase DB

    Best way to connect metal trunking to side of three phase DBs? Currently install male and female bushes and lockrings to hold them together but would like to be able to have one slot but seems like it could be quite a bit more work as would need to slot the trunking, DB and paxolin? Thanks
  7. T

    230v single phase motor on 208v 3ph

    Hello. I have a piece of equipment that has been running fine for 2yrs but has recently began to shut off after running for less than a minute. I replaced the switch at the manufacturers suggestion which didn't fix the problem. The building has 3ph. The tool has a 5hp motor which is rated as...
  8. 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...
  9. 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...
  10. 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...
  11. 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?
  12. 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...
  13. 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?
  14. 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...
  15. 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...
  16. 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...
  17. 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?
  18. 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...
  19. 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...
  20. 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...

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