three

  1. 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...
    • wtc
    • Thread
    • domestic meter metering phase phases single single phase three three phase
    • Replies: 4
    • Forum: Domestic Electrician Forum
  2. 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...
    • voltair
    • Thread
    • equipment phase protection rcd required socket three three phase
    • Replies: 6
    • Forum: UK Electrical Forum
  3. J

    On site guide single core Mv/A/m question

    Hello all I have a quick question on using my on site guide. I've found this forum fantastic for help so far. It's quite simple. I have a question which asks what the voltage drop for a single core 6mm² 70⁰c insulted cable for a single phase circuit is, enclosed in conduit. Page 151 of the...
  4. M

    Quick installation check?

    Hi guys, just want a quick sanity check on an installation. a chap wants 3, 3Kw heaters wired with a programmable thermostat to control all 3 heaters. my thoughts are: 40A supply to a Contactor ( L-1, N-3) heaters connected to the contactor ( L-2, N-4) then a Perm live to the thermostat...
  5. 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...
  6. 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...
  7. 7

    Heating under floor heating help please

    Hello there If i could have some advice please on a heating system would much appreciated Done a few heating systems in the past with s & y plan systems however an extension i have first fixed the customer is now installing under floor heating. There is a circulation pump, a manifold and two...
    • 714gold714
    • Thread
    • floor heating help help please manifold please three under where
    • Replies: 7
    • Forum: Central Heating Systems
  8. S

    Getting to know 3 phase

    Hi guys first time poster. I've been doing domestic electrics for around 7 years now but now looking to get a job working on 3 phase machinery and wiring and was looking for information to refresh my memory as I haven't done anything since leaving college. For example tests like phase rotation...
    • stevesilva
    • Thread
    • 3 phase getting knowledge motor phase three welcome
    • Replies: 6
    • Forum: UK Electrical Forum
  9. 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!
  10. 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...
  11. C

    Contacting a 5 Kva generator to standard 3 pin vacuum,please help

    Hi , please can I ask your advice. I have searched everywhere for an answer and am confused. Pin short I have bought a 5 Kva generator to power a 3300watt vacuum and I need to know how to connect the generator which is fitted with a regulator to a standard three pin socket into which I can plug...
    • CLEARWAY
    • Thread
    • generator help kva please socket standard three vacuum
    • Replies: 1
    • Forum: DIY Electrical Advice
  12. 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:
  13. W

    3 phase

    If you take aone line to a single phase ccu does that mean that the... 3 phase did board you took the phase from is now only a two phase and can't operate three phase Also if so can you run e.g a single phase lighting circuit on a three phase dis board
  14. 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...
  15. 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...
  16. 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...
    • Tomhagan
    • Thread
    • pfc phase system test three three phase
    • Replies: 6
    • Forum: UK Electrical Forum
  17. M

    2 three port valves with boiler running constantly

    Hi Guys, I've just looked at a heating system which has a few issues like immersion stat faulty. This is the current set up - Upstairs has H/W tank (that also feed downstairs) and heating both fed via a 3 port valve to a pump down by the boiler. Downstairs has heating fed via a 3 port valve...
  18. S

    three plate wiring

    doing a bit of diy on my lighting at home upstairs and got a fault on it now is it a supply to your first light , then loop out to next light and a pair down to each shift as done it that way but no joy , any help much appreciated.
  19. S

    3phase supply to 3 single phase solar inverters

    Hi all .First post . I'm an electrician working for a solar company company. We have a commercial solar install starting tomorrow. The array is split into three lots of 33kw . I can't be certain on very more details than that for the time being. It will have 3 single phase...
  20. 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/...
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