3phase

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  1. T

    Pat testing - 3phase 4P extension lead

    Hi just trying to get my head around how to go about pat testing a 3phase 415v 4 pole extension lead, on the first test (IEC polarity) it looks like it needs to see a closed circuit on each pole being L , N , E independently, obviously there is no neutral connection as it stops at the commando...
  2. W

    Home Lathe with 3 Phase inverter tripping mains

    Hello - hope someone can advise please. I have a recently purchased second hand Myford lathe which has a 3-phase inverter (Siemens Micromaster 410) Lathe all works fine but regularly trips my RCCB 80A 30mA breaker taking out half of the board - usually when first powering on. The inverter is...
  3. Kyle808

    Could anybody help me diagnose this problem?

    Hi I have a 3phase shop in a high humidity area in (Hawaii) and I'm having some issues with low voltage on the single phase outlets on the 120v side. Every once in a while the electric goes out on the regular outlets but the three phase works perfectly fine. Usually at night all the outlets...
  4. will_505

    3phase 32amp socket swap for 16amp

    Hi there, I've got a 3 phase compressor and a small 8500W single and 3 phase generator. My compressor has a large 32amp plug on it but my generator only has a 16amp socket so my question being can I swap the 32amp plug to a 16amp plug? Sorry if this is a daft question. Thanks guys 🙂
  5. newfutile

    3phase DB as single phase

    It's coming out anyway so it's a rhetorical question. What do you you all think of this? Bits of wire used to bridge the bus bars and don't single phase consumer units need a linked switched line and neutral?
  6. T

    Electrician Jobs Electricians required in Rotherham in the next 2 weeks .

    Please respond with questions and availability.
  7. S

    Advice on 3Phase Hob

    Hi there I have not done a huge amount of work on 3phase. I am installing a Induction Hob as part of a new Kitchen refurb- to be specific the hob is NEFF T59FSRX2. It is a 11,100W with the ability to power limit and support single or three phase connection. NEFF have not provided great...
  8. C

    All devices on 3phase board tripped simultaneously

    A customer recently lost power to part of their electrical installation. On arrival I found all IEC 60947-3 devices had supposedly tripped - including the main switch rated at In 400A. Excluding the possibility of someone tapering with the board, can anyone think of any other reason why this...
  9. OnlQQker

    Balancing 3Phase.....

    I was speaking to an Electrician a few years back as he was balancing out a 3 phase supply. To me it sounded like he was trying to get close to each phase supplying roughly the same Kw's to both of the lines/live/hot. Is this correct, if so how close do you have to be in this balancing stage...
  10. H

    All electric flat require a 3phase supply

    Hi! Currently doing a job that they have decided against getting gas meters and going all electric. Electric boiler 9.5kw 2x shower 9.5kw Hob say 6.5kw 2x 32a ringmains 2x 6a lighting circuits I understand they have had a 13Kva supply installed. Obviously this will not be enough to run all...
  11. marconi

    when did they stop selling these 3phase 32A switch fuses?

    Colleagues - may have some help in finding out how old or when they stopped selling this item piece of switchgear please? Is it BILL as I recall it is without revisiting the site? And from this picture alone what do you think of its material state and life remaining? I have other pictures but...
  12. L

    3Phase Motor breaker - overload schematic

    Hi all, I recently bought a CNC router and dust collector and need to connect it to my 3x380v+N power source. I want the CNC router connected to the under/over voltage protection and the motor also connected to the overload protection. Can someone please check if I connect the machines as in my...
  13. sythai

    3Phase ASHP - 16a RCBO/ TP

    Hi Guys Got a new build house coming up, has 3phase ASHP specified. Company commissioning the unit have specified to supplied via an RCBO, type C or D. Done quick google and struggling to find any reputable make of 16a 30mA RCBO/ TP that will do the job..... anyone help me on this please ...
  14. S

    3phase surge suppressor connected to a single phase utility supply.

    I am using a 3 phase 4 wire surge suppressor on a single phase 240V mains. Is it still okay or will it have some back feed impact on the mains system?
  15. M

    UK After 3phase board, ideally some board wiring/testing too - LONDON/SE

    I'm a mechanical manager with some electrical background (2330 L2 from college, 18th ed, 2392). About to be an M+E manager so need to brush up on areas I'm unfamiliar with - 3 phase wiring and testing is the big one. Is there anyone in London area with access to a (used) 3phase board who can...
  16. bigspark17

    Kva 3phase demand calc

    Hello all, looking for a bit of advice not been asked to fill in a new power supply for dno for a commercial premesis before. Do i put 70kva for a 3 phase supply that equates to 100A 3 phase head? Usually on single phase i put 18.4kva for 80 supply and they always provide 100A head. Thanks in...
  17. T

    Global IR testing on 3phase

    Evening all Does anyone have any advice or methods for global testing on a 3phase consumer unit? Cheers
  18. S

    Motor rating plate help 3phase

    Evening all, got this rating plate on a portable feed augar motor, it's currently wired in some seriously past it SY cable, the farmer wants to renew it , I've suggested H07RNF as best choice, but I'm not clued up on reading motor plates to size it, I see 29 on the plate, and assume it to be...
    • suffolkspark
    • Thread
    • 3phase help motor plate rating
    • Replies: 7
    • Forum: UK Electrical Forum
  19. R

    Feeding domestic db from 3phase db -advice please

    Hi All So i have just got a job of doing a rewire on a small flat, which includes change of DB etc... Currently this is fed from a 3 phase DB in a commercial premises below. The feed cable is over 25m long (16mm T&E). the client has asked for a sub main tennant meter to be installed. At the...
  20. M

    Can I Just replace a 3phase motor with a single phase on my lathe?

    I have a metal lathe, 1.5hp, 3phase, 575v motor. Can I just replace the motor with a single phase,220v motor? Would all the lathe wiring , switches, relays work? IF so, what HP motor should I buy? Thanks,
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