three phase

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  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...
  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...
  3. 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...
  4. 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...
  5. 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!
  6. 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 The old Britway power track under the floor is obsolete and thus the landlord is paying to get it replaced.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...
  7. 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:
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. H

    12KW three phase immersion heater

    Hi all, good afternoon. New on here, so here goes! Quick question and some advice really! I have a 12KW three phase immersion heater installed into a hot water cylinder (for commercial premises). The immersion heater enables and disables via an on site building management system so therefore...
  13. M

    Three phase calculation

    Hello everyone please can someone calculate the current for a three phase machine at 28kw unity pf I already I have seemed to forgot how to use the calculator cheers in advance 27kw three phase
  14. B

    Three phase Immersun equivalent - does one exist?

    I have a couple of domestic clients with 3-phase PV and they could usefully use something like an Immersun to power a single phase load, but by monitoring import/export on all 3 phases, not just the one. The reason is that meters net the power consumption across the phases. Does anything exist...
  15. spud1

    Fault on three phase sports floodlighting

    Hi, I have a single fitting on a 3 gang, 3 phase floodlight over an astro-turf at a school that wont work. I have changed the 2kW MH lamp with no joy. Is there a safe way I can test the dedicated ballast and ignitor for correct operation? There is voltage on the incoming terminals on the...
  16. A

    Permissible voltage drop 415V three phase power circuit

    Can anyone tell me what the permissible voltage drop is for a three phase circuit serving a power circuit. Is it still 5% like for a 230V circuit. I don't have my BS 7671 to hand at the mo. Thanks in advance.
  17. F

    Three phase supplying a domestic flat.

    Hi guys, i had a look at a building in the west end of london which is spilt into 10 flats this weekend to do some upgrading works to the landlord area. i noticed that there was originally 6 flats and the landlord must of added an addition 4 flats on top. Called 10 9 8 7. ( obviously). The...
  18. D

    Three Phase Flex - two black cores?

    Hi chaps, Spent today repairing a load of 63A and 125A three phase flexes. When taking the damaged plugs off I was somewhat surprised to find that two of the cores were the same colour... Can anyone explain why I've got two black cores and one brown? I was expecting to find black, brown and...
  19. shakerbess

    un-balanced three phase system

    hi i was hoping to get some help with a question please. why does the current flow in the neutral when the three phase system is un-balanced? is it to do with the fact when you have an unbalance between the phases the difference of current between the phases that causes excess current will...
  20. E

    Three Phase Load Calculations

    Evening Chaps, I need some assistance with regard to a three phase load calculation. Back story here is im fitting a new supply cable for an industrial three phase oven and need to know what the max load will be per phase to ensure adequatley sized cable is is fitted. The cable run will be 80...
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