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three

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  1. 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...
  2. 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...
  3. 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...
  4. 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.
  5. 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...
  6. 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/...
  7. 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...
  8. N

    Moving main supply, fuse and meter (homeowner enquiry)

    I'm having building work done and would like to have the incoming supply, main fuse and meter all moved. The house is one end of a terrace of three and the main supply is overhead to the other end of the terrace. It crosses the front of the three houses at 2nd floor level and then drops down our...
  9. jordanlewis88

    Level 2 student, going on level three seeking apprenticeship in bedford/bedfordshire

    I am currently studying a Level 2 diploma in electrical installations at Bedford college, and i am nearing completion of the course:sorcerer:. So far completing the 202 and 203 modules of the course which are principals of electrical science and electrical safety. I also have some experience...
  10. 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...
  11. yellowvanman

    Wireless switches

    Planning a re-wire of a very old thatched property. All lighting will be via 2A sockets (except bathrooms) and some of the walls are just wooden planks (building control are very protective about them) and it wouldn't look nice clipping cables on the surface to a switch on a surface pattress...
  12. 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
  13. 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...
  14. A

    Three plate & loop in methods

    Hi, I'm an electrical apprentice and wanted to know why the loop in method is preferable in industrial applications to the three plate method. I've learnt these methods at college but it seems that people at work think they're the same thing. Thanks
  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. N

    Advice - Please 2 or 3 wire circuit

    sorry for such a basic question, is the circuit in the picture attached a 2 wire circuit or a three wire circuit, I am looking to install a 2 gang dimmer switch and it says it needs a three circuit with neutral Zwave TKB Dual Paddle Wall Dimmer2 Thanks Neville
  17. 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.
  18. 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...
  19. T

    Three light switches on one plate

    Hello there, just had a triple light switch fitted but the order of the switches is wrong. The left and centre switches need to be swapped. Can someone please tell me how do I do this? Picture:
  20. E

    AEI single phase motor,with 6 terminals and three circuits.NO centrifugal switch.

    An acquaintance of mine has an AEI six terminal single phase motor, with three circuits. Z1- Z2, A1- A2, A3- A4. The starters is an AEI Stayrite. Apparently windings A1- A2 and A3 A4 are connected in series when starting. Z1- Z2 the start winding, together with a capacitor is connected in...

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