phases | Page 4

phases

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  1. amlu

    burned mice and 3 phases dead

    had a last minute call out to a shop today. all electrics dead, checked db first, found a fried mouse between bus bars. no power coming into the db, checked on the meter, nothing, checked incomer fuses (100a) they good, no power going to the fuses. advised them to call to DNO. they said...
  2. Floody

    An explanation of Phases?

    Ok so I hear quite a lot the term 'single phase'. & '3 phase'. Can anyone elaborate on what this means and possibly give some examples? Thanks
  3. the pict

    Tri phase board out singles in

    I am doing commercial refurb at the mo, everything is supplied from an old Memshield 3 phase board, the landlord wants the various spaces metered so he can bill the tenants separatly, at present he is just adding a flat rate to the rent, I have no issues with how to go about it however one unit...
  4. S

    G59 Relay

    If we have 3 x 2500wp single string arrays on a 3 phase supply (split evenly over phases) using SMA 2500HF's will we need a G59 relay for sure or is it up to DNO? The SMA's are not G59 as far as I know only G83.
  5. G

    reasons for DNO decisions on limits, transformers and balanced phases?

    Hi all, I just wanted to pick some brains ahead of having a chat with a potential customer. Essentially it's a farm with a single phase supply, but an 11kVA 3 phase line a few hundred yards away. There are actually 3 farms clustered together, and I'm thinking it's likely that they're all fed...
  6. B

    Immersun vs solar thermal

    I am being asked to quote for some solar pv, solar thermal and gshp on a listed building. The solar pv will be a TIC of 10kW. There is no requirement for baths/showers, just hot water for a kitchen. Although I will of course quote and probably fit whatever they want, with the advent of...
  7. T

    415v between phases

    Been at a call out in a block of flats where on ocasions there has been a power surge.On further investigation the culprit being a slack neutral on the main incomer coming into the building. Now i understand that the loss of a neutral can create a voltage of 415V but can anyone give me a proper...
  8. rustynails

    2392 Question - Balanced prospective short circuit current between lines

    The prospective short-circuit current between line and neutral is measured at 900A. The maximum balanced prospective short-circuit current level between lines, as a rule of thumb, can be assumed to be approximately: A: 0.9 kA B: 9 kA C: 90 kA D: 1.8 kA :banghead:
  9. P

    Testing question following successful 2391 result

    Hi all I passed my 2391 about 6months ago and thought I was flying, I know test procedures & how to carry out the tests like the back of my hand and I fully understand any results I get and how to rectify or diagnose any faults in a electrical system.....but then again I have only tested...
  10. S

    3 phase or not 3 phase

    Hi all came upon a 3 phase + N supply into a domestic property with only one of the phases being used to feed the c/u. On the cert do i put down 3 phase or single phase thanks john
  11. H

    2 phases into standard CU?

    I want to introduce an IR heating system into an existing split load CU. It is supplied at the moment by 1 phase of a 3 phase input, controlled by a 60A main fuse and a 40A meter. The 5 existing circuits are 2 x 32A ring mains, 2 x 6A lighting and 1 x 16A water heater. The total wattage for the...
  12. P

    Energy Consumption on 3-phase with solar into one phase

    Hi Quick question about a system a user wants who has 3-phase electricity. If we install a 4kWp system onto one phase, when it is generating more power than is being used by that phase, will the other phases consume that power, thus slowing/stopping the meter, or is it lost back to the grid...
  13. S

    Two single phases through one isolator?

    Morning guys, I'm new to this so bear with me! I have two 16a single phase machines that I want to supply with a single cable. I want to use one neutral and earth for two separate circuits. Is this possible? I seem to remember when N is a load carrying conductor, combining two loads could burn...
  14. F

    3 phase polyphase meter,, landis an gear

    i am sepperating a small unit from the main building next door. the owner wants the said unit on own supply and on own meter to resell the electricity , i have seperated the circuits involed , a 10amp lighting cct, a 32 amp ring final and a 3 phase 32 amp isolator . i have placed the ccts...
  15. N

    Help: Light commercial with three phases - Fit and inform still?

    hi, Haven't done a three phase systems and have always assumed that staying under 16amps per phase can be fitted, and DNO informed afterwards. Is that correct or does the DNO have to approve prior to installation. thanks in advance. RN
  16. V

    3 phases in one switch box

    hi all ive been asked to wire some high bay lighting in a unit from a tp+n c/u. my question was as its accross all 3 phases what do you do about the switch end? i dont like the idea of 400v in a metal switch box. ive got 4 rows of 400 hids and want them switched in rows. ta all vitoboy
  17. rmaynard

    Drop over 3 phases

    I have installed a 16a 3 phase extract fan, when doing my testing after id finished i had 403v between phases, boss thinks this is ok but i think its a bit low, anyone?
  18. dlt27

    3 phase meter

    The company I work for sent out some guys to connect up some temps through a 3 phase meter. Now the circuit was fed via an existing board with a 63A breaker and the existing board was backed up by a 160 amp mccb.(plus an rcd for the sub-main). The 3 phase meter so I have been told went up in...
  19. S

    Wylex bs 4293 100ma type s RCD Tripping times

    Does anyone know what the tripping times for an Wylex bs 4293 100ma type s RCD are? Ive been searching the net and just keep getting more and more confused about this i know an bs6009/9 should trip within 130ms-500ms but cant make headway for the tripping times for an older bs4293 rcd.
  20. E

    Architect Specification for PV job

    Hi Guys Just wondering if anyone could help me with this. I have to submit a quotation for a job but its larger than I have done before. The electrical AC side I havent a problem with its more the PV spec. So here is what I'm working with- The contractor shall allow for the supply and...

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