three phase | Page 6

three phase

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  1. T

    Three phase extension lead with single phase socket outlets

    I was flicking through the Scame catologue at the wholesalers today and noticed a picture in the catologue of a three phase extension lead, and on the reel it had single phase socket outlets on. It got me thinking, What would be stopping you wiring a three phase plug on to a single phase...
  2. N

    Wiring A Three Phase Contactor With 24v Coil

    Morning gents, Im trying to find a wiring diagram for a three pole (three phase) contactor, using a 24v coil. Ive found plenty with a 240/415v coil but none with a 24v coil. Im assuming theyre both very simular, only difference being you'd have to pick up your 24v from a different source instead...
  3. C

    Three phase inverter for three separate MPAN's?

    Morning all Just looking for some opinions on a situation we have for an installation. Essentially we have a three phase supply coming into a building that has been converted into three dwellings each with their own registered supply meter - one per phase. So the question is whether (and I...
  4. S

    TRAINEE QUESTION: Three phase motor system, non-standard wiring colours in flex?

    Hi. Just a question from a slightly confused trainee about core colours on a three phase appliance. I was diagnosing a fault on a three-phase saw today (found it - dead isolating transformer) and found that the incoming cable (4 cores) were coloured and connected as such: L1 Brown L2 Black...
  5. rolyberkin

    Three Phase Power Supplies

    Hi All I have no experience of working with 3 phase (over and above jointing HV stuff!) when I run a 3 phase cable for say three motors each rated at 16amp, is it normal to run one suitably sized cable as a radial to pick up all three motors or should they be separate runs?
  6. rolyberkin

    Baancing Three Phase

    Hi All I am doing an assignment and wondered on a practical/safety note if there are any issues in balancing luminaires over three phases in the same office area fed by a three phase installation, say if I had 21 lights should I put 7 on each phase or stick to one phase and just split them over...
  7. D

    three phase advice for newbie

    hello, I am after bit if friendly advise on 3-phase as don't have a lot of experience with it. 3-phase + N supply being fitted to a existing site as there is going to be a very large demand with house, outbuildings and swimming pool. the main intake and 3phase meter is in garage that is...
  8. L

    Three Phase Calculaton

    Hi All Just a quick question as I can't remember. Does the following equation calculate the current per phase or the total current over the three phases? I(A) = 1000 × P(kW) / (√3 × PF × VL-L(V) )
  9. W

    Domestic three phase with single phase PV - net metering

    Another family member had a number of eco features added to the home when built a few years ago. This included a ground source heat pump, hence the three-phase, and solar PV. I had a look at the setup recently and observed the solar PV is single phase. Furthermore, it is on a phase with one...
  10. V

    RCD For Three phase

    Hi, 1) To comply with the latest Reg's I assume that 230v 16A sockets for general use, now need RCD protection. 2) If the same type of outlet is for additional isolation of fixed equipment , an RCD is not required as long as it is labelled that it is not to be used for any...
  11. H

    Three phase problem

    A friend asked me to have a look at a piece of equipment he had recently had installed. It's three phase with an internal transformer (415v to 24v) that provides 24v for the hand switch to operate a relay to switch on the motor. It doesn't work. I measure 8v on the relay rather than 24v. I...
  12. S

    Single phase to three phase inverters

    Hi there. I have been looking at one or two inverters. Does anyone know if the Invertek Optidrive range is a good one to go for? It does seem a little cheapish for a 3hp drive. I know this isn't the best way around it, but for people who don't have a three phase supply and just want to run...
  13. markythesparky

    three phase rcd

    Hi guys. Can anyone explain in simple-ish terms how a three phase rcd measures a currents imbalance? It can't be between phases as not all three phase systems are balanced equally so it must be between phase and neutral big how? Just curious!
  14. M

    Three phase vs single phase underfloor power track

    My office is moving premises to a larger office of circa 8,000 sqr feet. The old Britway power track under the floor is obsolete and thus the landlord is paying to get it replaced. We are an office type company of around 40 people and our projections show us growing to over double in the coming...
  15. Greatwhiteshark

    Three phase with neutral....earthing ..?

    Hi everyone. please comment on the earthing of three phase as a new installation . Then are you allowed to use the armour or not and what is the Regulations about earthing when there is a cable with 4 core but you need a neutral and a earth plus the 3phase..? Many thanks M0LVW:dizzy2:
  16. W

    Three Phase Distribution Question

    Hi, I just have a quick question... in the factory I am working in there is a 63amp Mcb feeding an 32Amp Switchfuse which is then feeding a little distribution enclosure which has a 20amp Mcb for one rcd socket, 20amp,16amp, 10amp and a 4 amp for machinery. is this right because it does not seem...
  17. S

    Three Phase Enphase

    Hi all. I have two questions if anyone can help. 1st. Has anyone installed Enphase micros to a three phase system. I can't find much info on the internet. How does the Envoy communicate with the micro inverters as you can only plug it into one phase at a time. The nearest ring main to DB is on...
  18. T

    Pfc test on a three phase system?

    Hi I'm currently coming to the end of my apprenticeship having completed my city of guilds level 3 and 17th. i completed my am2 last week and passed everything apart from my testing and inspecting. I would just like abit of advice on how to complete the pfc test correctly as I failed on that and...
  19. J

    Circuit breaker for a three phase motor

    Hi guys, The question may be too easy, but when I think more over something at the end I start to doubt what is right and what is wrong. So I was wondering how do we choose circuit breaker for a three phase motor (lets say 6 kW, 400V, pf=0,8? We will need to calculate the current - I = P/...
  20. BigSi

    Three Phase Emergency Stop Button

    Hi all. I’m after a bit of advice regarding emergency stopping. I’m carrying out some remedial work on a building where it was noted that an hydraulic band saw had no form of emergency stop. The machine is started by it’s own start button, but relies on a stop leaver to activate when the...

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