arrangement | Page 4

arrangement

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  1. R

    generators

    Does anyone have any experience of testing when generators are involved? All ZS readings come out too high for RCBO's that protect the circuits! any help or advice would be greatly received.
  2. M

    Any 1 Help me with what earthing arrangement this is?

    Hi working on a Farm/Stable.. Doing a PIR on the holiday let/Workers Digs.. Went to the Intake as iv got about 4+ boards to test. Phoned the DNO they said hes got polyphase but said they didnt think it was PME. The Supply comes from the pole and is clipped direct to his house and ends up in this...
  3. D

    3 phase Meter Arrangement

    Hi, I have been asked to 'get the installation ready' for the electricity supplier to come and fit seperate meters. Currently:- The building is broken up into 5 seperate dwellings There is a 3 phase supply running straight up through a Ryefield dist board. The 3 phase and N Supply cable has...
  4. S

    Earthing arrangement at a factory.

    Okay, been working at a factory today and need to establish the earthing arrangement of it.. The power comes from a substation which has an earth electrode, then after the transformer the cables come into the factory with the earthing conductor.. Am i right in saying the installation is a...
  5. M

    rcd

    if a outbuilding is feed from the rcd side of a board in the house will this cover all wiring in the outbuilding, so alterations needed to the outbuilding board such as rcbo or rcd.
  6. DiscoDave

    Max Zs for earthing arrangement?

    as per OSG pg 11, TN-C-S = 0.35 TN-S = 0.8 TT = 21 But where is this in the regs? It's been doing my head in for the last half hour and i know i'll kick my self when some one points it out but please help cos it's not funny any more!:mad:
  7. C

    Trying to get an earthing arrangement from the DNO

    Just called EON to find out the earthing arrangement of a commercial premises (not obvious whether TNS or TNCS). The lady didn't have a clue what I was talking about and said they could put a PME in if I wanted. I've not had to call before so am I being daft here? It is EON who should know this...
  8. G

    earthing arrangement ?

    Came across this today whilst pricing up a job. The Earth is the main bond from the CU, it terminates in the little henley block, then the bare copper core from it disappears behind the wooden board the meter and service head is mounted on. The house is about 50yrs old, and is fed from cable...
  9. C

    Commercial premises - most common earthing arrangement?

    Hi everyone I've just had to do a quick emergency repair in a commercial premises as I noticed earth wires hanging out of a junction box while I was in the roof on another job! It was a right bodge so I crimped all connections properly and tested in full. I want to write them a minor works...
  10. H

    circuit arrangement in consumer unit

    Hi just wondering what way everyone else arranges their circuits/mcb's in cu's. I've 2 split consumer units in a house i'm doing at the mo and probably about 14 circuits. So over the 4 rcd's would you put all the lights on one rcd for example or would you put upstair lights with downstair ring...
  11. P

    Star Terminal Block Arrangement

    Hi all, Query about Star Terminal Block Arrangements. On our notes online, it says “the start ends of each winding (aren't these U1, V1 and W1) must be connected together to form the star point and the finish ends connected to the 3-phase supply.” Should it not be the other way round, i.e. the...
  12. S

    CTs arrangement for differential Protection

    As we know that for differential protection, CTs on transformer primary side(star connected) are connected in delta & CTs on transformer secondary winding (delta connecred) are connected in star to cancel 30deg phase shift because of star-delta connection. Now what I want to ask is that do...
  13. S

    Differential Protection: CTs arrangement for star-star connected power transformes?

    For differential protection on a delta-star connected power T/F, CTs on delta side are connected in star & CTs on star side are connected in delta to compensate for 30 degree phase shift because of star-delta connection. What would/or should be this arrangement for Star-Star connected T/F?
  14. A

    Earthing arrangement

    Some of the building I have been testing have both SWA supply earth and an earth electrode. What would you call this arrangement?

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