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  1. BodgeJob

    Omission of overcurrent at origin of installation?

    Hi all, My question relates to the omission of overcurrent protection (specifically overload and fault protection) at the origin of an installation. Am I right in saying that DNOs allow this for meter tails, due to the maximum length of 2 or 3m, insulated and sheathed nature of the tails and...
  2. M

    phase rotation incorrect at origin of install .

    Hi all, What are your views on phase rotation. Whilst doing an eicr for a customer's premises I found that the phase rotation at the origin was anti clockwise . the eicr form is asking for verification of phase sequences , which there is although anticlockwise . What would you do there in the...
  3. T

    'Particulars of the installation' for two submains split at the origin.

    At the origin, I have 25mm tails split to two fused switches. One 63a fuse protecting a 16mm (3 core SWA) submain to a DB (100a main switch RCBO board) at one side of the property and one 80a fuse protecting a 25mm (3 core SWA) submain to a DB (100a main switch RCBO board) at the other side of...
  4. DjMadness

    AC circuitry: basics of energy flowing and returning to its initial source (origin)

    Hellos In AC circuits, electrons flow from phase (live) and must return to neutral through a load (assuming single phase) just like the way in DC circuits where energy flows from + and return to - (supply terminal) hence "completing" the circuit and doing a significant job i.e glowing a lamp...
  5. A

    No ze at origin of tt system

    Hi guys, cannot get a resistance reading when using my Robin loop tester. It just shows 204v and the red do not proceed lamp lit. Never come across this before any ideas would be appreciated. (The live neutral reading is 243v) New rod fitted and driven in to good ground at about 2.3 meters.
  6. M

    Ring spurred at origin?

    Hi all, DIYer here. My garage has a double socket fed by 4mm2 twin and earth connected to the same circuit breaker has the ring main for the sockets upstairs in the house. The MCB is a B32. Is the feed in the garage considered a spur from the ring main or is it a separate radial circuit...
  7. A

    TNCS High ZE at origin

    Hi there Testing at origin of a domestic property, I have found: L-N: 0.44 Ohms L-E: 9.89 Ohms I had the DNO attend clients address, there response was that it was quite high and confirmed readings of 0.44 for ZE. (Pleasee attached document with their response) My concern is they don't seem...
  8. bigspark17

    Test stickers on large EICR's

    Do you guys labbel every db with a next test date sticker or just at origin.?
  9. bigspark17

    Tt no rcd at origin

    200A 3phase tt system with metal clad control panel no rcd at origin 4pole main switch. I have always put rcd at origin but it has been put to me if you can prove a very stable low Ra (ze acceptable) rcd may omitted? What is an acceptable low level and how can you prove it will stay stable. No...
  10. P

    EIC origin of supply

    On an EIC what would you record as the origin of supply details if the sub board the circuit has been installed on is its self supplied from a sub board. Long story but we have had some work done by a contractor who used a subby for the electrical install and he has but the local board that the...
  11. joel89

    Testing ze at the origin

    Hi all I'm an industrial sparky on maintenance doing my eal initial verification exam tomorrow was just wondering when doing ZE at the origin, do you do Neutral L1,L2,L3 and then Earth L1,L2,L3 and N+E ? Or is there between phases too? And is this the same for The PFC?
  12. S

    help with testing

    Hi guys Need a bit of help on testing in a hotel (bit of background) its a 7 storey building with main switch room in basement as a working hotel nothing can be switched off. On the 7th floor existing rooms were refurbished with 8 new rooms added there is a busbar trunking running up the...
  13. B

    which origin

    Hi all I'm currently doing a condition report on a domestic property in an old peoples home, the c.u is fed from a ryefield board in the switch room protected by 60 amp fuse, outside the property is a dno fuse head and meter. Earthing arrangement is tnc-s, which origin do I report on the cert
  14. W

    Earthing at the Origin

    Hi All, All my work is commercial/industrial and I have a question on a domestic. Replaced a cracked socket at a friend's house for them and plugged in tester to do a quick Zs afterwards. 59ohms on a TNS = wrong. Turned off the board and did a Ze which gave 58.5ohms although couldn’t connect...
  15. W

    EICR Form question re multiple CUs at origin

    Hi, just a practical question re the filling on of a 'standard' Dom EICR form.. Take a domestic installation where alongside the main CU at the orgin sit 2 other DBs (later additions just feeding a couple of circuits each, all internal to the house) All 3 are sitting next to each other with...
  16. S

    Origin of Ze Values...

    Where did the nominal/limit values of Ze for TNS and TNC/PME originate from? I mean the values that are listed in OSG and various other publications, but why? Does it really matter? As long as your Zs for a cct falls within the max for the protective device...
  17. E

    Volt Drop

    Hi all, Just wanting to clarify regarding volt drop. Client is looking to add lighting to garden, to be supplied from 13a FCU, load on FCU will be less than 1A due to LED lighting. The FCU will be an addition to a final ring circuit which serves dining room and lounge, protected by 32A MCB...
  18. dc-electrix

    Mobile/Park home EIC Form filling

    Hello, Hoping someone out there is familiar with this type of installation and how one fills in the forms. I will describe what I have in front of me. The home is fixed it has bricks around the bottom but a chassis with wheels. The chassis is bonded to the MET Gas & Water is connected and...
  19. infinity

    Multiple boards at origin & Easycert

    Just testing a commercial property which has all original equipment installed from a 100A BS3036 isolator to Main DB. Then 3 more DB's have been added before the switch fuse via Henley blocks. I use easycert and was wondering what anyone else does in regard to listing the arrangement. Would you...
  20. P

    Spur at point of origin

    Just a quick question, I know you can spur a ring at the C.U. but can you do the same with a radial? I have not seen it done that way on a 20A A3 radial. It is only for a test rig I am putting together to train students testing so its not that important any thoughts?

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