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  1. L

    Three phase socket query

    Hi, We have a three phase 400v socket rated at 63A. It is proposed to use this for a mobile skid. There is an 18.5kw motor and an approximate estimate of current is 34A, the supplier is saying that the socket is not rated high enough as the skid has dual redundancy ( two 18.5kw motors) and as...
  2. D

    Single to three phase converters

    Has anyone had any experience of using these?? Any good?? Got a customer who wants to put a 3 phase 11kw chicken rotisserie into a shop with only a single phase consumer unit and doesn't want to spend 10 grand on getting a new supply.
  3. R

    How to carry out PEFC and PSCC on a three phase db with a rcd as the supply?

    Ive got my am2 resit tommorow for my live testing and I ran out of time and failed as well as I carried out the ze test on 2 lead high thus tripping the rcd. So now I know for next time to complete this on a 3 lead LOW test and measure ze with earth disconnected etc.. then connect main earth...
  4. C

    Calculating three phase power usage.

    I’ve been asked to calculate power usage of a machine to works out how much it costs to run. Current draw is: L1: 9.71 L2: 9.61 L3: 11.14 N: 7.78 Obviously when designing a circuit you would base it in the highest phase ampage. But is power usage worked out the same way? Or are three...
  5. L

    Single Phase Load Estimate to Three Phase Power Supply

    Hi Everyone I would be glad if you could clarify this for me: For a Load Estimate Survey whereby 95% is single phase, the Load Estimate is 90 KVA (Single Phase). However, the power supply is three phase 4 wire system. To calculate the current per phase, the 90 kVA is divided by three i.e. 30...
  6. G

    Single Phase Charger on Three Phase Supply

    Hi all, been a bit of a lurker of the forums here for a while and so far they have saved me more times than I can say, but now I have a question that I am hoping you can help me with. I have a single phase forklift charger and it currently has a 2p+e plug and connects to the corresponding...
  7. J

    Domestic three phase? advice

    Hi I have recently moved into a small newly renovated (inc electrics) cottage and noticed appliances going really slow. Kettle taking an age to boil, toaster taking a long time, hair clippers going slow... you get the picture. UK power networks sent an engineer that changed the overhead power...
  8. M

    No neutral on three phase

    Hi all Need some help remembering some college work. Been doing a job and we are pulling in 400mm singles in parallel, got three phases and a seperate earth but no neutral. From what i remember from college was it becuase if you had the phases all balanced youd have no...
  9. P

    three phase coolant pump

    Hi i have just bought a lathe which is running on three phase i have bought a vfd to run the lathe from single phase but i have a coolant pump that runs on three phase i have converted it to run on single phase but it appears to have a dip when running do any of you guys know what i need to do...
  10. H

    Common live wire for three circuits

    Hi, Hoping someone can help me with a lighting circuit challenge. I have an existing two gang switch, with one 2C&E cable for a simple circuit and one 3C&E for a two-way circuit (using conventional 3 control wiring). It's an older property but pretty conventional loop-in loop-out radial...
  11. C

    Three phase upgrade question

    Hello all...hope someone here can help.... currently have three phases coming in to the property (old farm) but only receive single phase with a single phase meter. The overhead cables were upgraded a few years ago so the cabling up to the meter is all fairly recent, I can see the 3x100amp...
  12. haptism

    NVQ3 2356, three phase question

    I will be enrolling on the NVQ3 2356 soon but have a question regarding the three phase element. As i work for agencys as an improver its seldom that I ever get asked to connect up three phase equipment, or test it. How have any of you previous students on the 2356 (mature candidate) found their...
  13. L

    Three Phase calculation

    Hi, need to ask a question about a 3 phase air condition. On it's data tag it is rated at 20Amps. When it rated like this are the 20amps on each phase? Thanks in advance.
  14. J

    Three lights one switch

    I have just bought these lights from B & Q Volos Sphere White Single Wall Light | Departments | DIY at B&Q - http://www.diy.com/departments/volos-sphere-white-single-wall-light/258109_BQ.prd I'm wanting to wire them (3) to one switch. What's the safest and easiest way to do this please? Many...
  15. A

    Question regarding 400V three phase lighting connected in Delta, without Neutral.

    I am in the process of designing the electrical installation of a community centre, and have a question about the provision of three phase lighting for a large function room containing 18 36W LED fittings. All of the light fittings are to be switched simultaneously. Would it be possible to...
  16. JK-Electrical

    Five electrocuted at Turkish water park including three children

    Five people were electrocuted on Friday at a water park in northwest Turkey, including two teenagers and a 12-year-old, Turkish media reports said. The three youngsters were caught up in an electrical current in the pool in the town of Akyazi in Sakarya province, the state-run Anadolu Agency...
  17. A

    How to determine the Line and Phase current and power of a three phase installation?

    I am attempting to produce a design for a theoretical installation with a three phase incoming supply (presumably Star/Wye with PME to star point), and am having some trouble understanding and determining the current and power of each phase, and the whole installation at the incoming supply...
  18. Dave Jenkins

    Four Ring Circus - an unconventional method of wiring ring finals

    I've been working in a Victorian semi. I was asked by the client to take a look at the wiring for the kitchen ring final - in particular the state of the wiring under the floor boards. What I found was a mass of cables connected into two 30A screw-terminal junction boxes. On closer examination...
  19. E

    Help with wiring three phase pool airblower

    hi. one of the electrition in our company tried to wire a three phase pool air blower {in star connection}. when he connected the three phases to the air blower after one minute the air blower coils were burned. the thing is before that there was another of one phase air blower and it was...
  20. R

    >2000 ohms on loop test?

    Hi guys, Was wondering if anyone could shed any light on why I would be getting >2000 ohms on my loop tests, on every circuit? I got .26 on the incoming reading, went to do the test on the cooker circuit and >2000, thought I'd try back at the consumer on the incoming and >2000 again, I'm using...

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