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  1. S

    Maximum distance for meter tails

    Hi All, Im in need of a little advice, I've been asked to change a consumer unit that is over 3 meters from the main feed! The location is in fact in the basement of a shop down stairs! So if you need to isolate the tails you would have to gain access to the shop and then to the shops store...
  2. G

    Electrical heads maximum distance to isolators

    What is the maximum allowed distance the fuse box, meters and isolators can be from the heads (the points at which the cables come in from the electricity board to the building)? I have some points which come into a basement flat but I'd rather have the isolators etc moved into a communal...
  3. Goody

    Question on maximum demand (load)

    Hi, the maximum demand (load) in a property is as follows: (4x32+4x6)0.40 = 60.8 amps and the main fuse rating is 60 amps. Does this comply, taking tolerance into consideration? What is the tolerance in this kind of situation? Should I ask DNO to upgrade the fuse and the tails? Many thanks!
  4. B

    Maximum RCD size for a house

    Hi Everyone, I'm going to a house to check an rcd that keeps tripping, think it's an 80A 30mA. I'm thinking of upgrading the rcd as it is the main switch for the consumer unit. Anyone know what I can use? Like time delay, up it to 100mA, not sure if they're not for domestic use? Cheers all.
  5. C

    Maximum Downlights Question??

    Hi I am in process of installing downlights in my brothers property and he currently has the following already installed: downstairs front room 12 x 50w downlights Hallway 4 x 50w downlights Current lighting circuit mcb is 10 amps. He now wants the following installed: kitchen/Dining area...
  6. K

    Maximum Zs exceeds manufacturer recomendations

    Hi, we have a 400A MCCB Bs60947-2 installed and the Zs reading measured at device is 0.2 ohms the manufacturer has listed the Zs value for this MCCB at 0.045 ohms , i have been informed by designer of circuit that because the Earth fault current is known to be 1537A he has just to tweak a...
  7. T

    Maximum tolerable fault current

    Just completing the testing of a transportable catering unit.(chip van). Within the NICEIC REPORT I must complete, a.MAXIMUM TOLERABLE FAULT CURRENT(is the same as PSCC)? b.MAXIMUM TOLERABLE UPSTREAM ELI.(is this the same as Zs)? If so how do I achieve these values when the Power...
  8. M

    MAXIMUM Ze at origins of TT, TN-S & TNC-S,

    Hello there, I know this may sound like a daft question but I am currently looking at A job where the Ze reading is 0.37 in a distribution board.It looks to be a TNC-S system by checking where the board is fedd from at the mains cut- out, the run from the mains is about 70 to this board and...
  9. S

    Conduit fixing distences

    Hi I don't have an onsite guide. I would like to know the maximum horiztonal fixing distence for conduit saddles
  10. A

    TT system - maximum earth fault loop impedence?

    I've recently completed a part p defined scope course but all of our testing was on TNS or TNCS systems, in our house we have a TT system and in the OSG I can't find much information on the maximum earth fault loop impedence, just says that it is likely to be higher than their TN tables? I might...
  11. B

    Maximum permissible ring resistance

    What is the highest permissible ring main resistance of conductors, end to end?
  12. W

    Limiting maximum demand

    Is there a readily available current detection device that can be used to disconnect one circuit as the other exceeds a set current? With or without integrated contactor? This is for use in a large static caravan which has many high-load appliances such as 2.5kW washer, 2kW tumble dryer, 2kW...
  13. P

    Calculating maximum demand

    Hi again I also have a query about determining the installations maximum demand for when an electrical installation certificate must be filled in. I have calculated the demand for my test scenario using Appendix 1 of the On Site Guide as 103.92A using the breaker values. However I have seen...
  14. B

    PV G59 application for connection with DNO

    Hi I am gettingmyself prepared for G59 connection applications for PV systems. Guidance onwhat is needed with regards to technical date and drawings would be muchappreciated. Withreference for the application form for 'e-on' http://www.eon-uk.com/downloads/G59_APP_FORM_AW.pdf...
  15. D

    DOE supply loadings, maximum demand

    Hi All, I have a three story house to wire, with the following floor areas: Lower ground: 144 square meters Basement: 157 square meters Upper floor: 94 square meters Apart from lighting circuits and cctv, electronic gates, kitchen circuit which is...
  16. I

    maximum Demand/ Diversity

    hi guys ive got myself a little confused here when trying to calculate a max demand figure for the installation below. 60amp TNCS supply to a bungalow. 1x 30A Ring Main 1x 30A cooker unit(with socket) 1x 40A Shower (8.5kw) 2x 20A Radials 1x 5A Lights (7x100w) using table 1B app 1...
  17. I

    Maximum Demand/ Diversity

    hi guys ive got myself a little confused here when trying to calculate a max demand figure for the installation below. 60amp TNCS supply to a bungalow. 1x 30A Ring Main 1x 30A cooker unit(with socket) 1x 40A Shower (8.5kw) 2x 20A Radials 1x 5A Lights (7x100w) using table 1B app...
  18. C

    Maximum Ze Values

    Ze values on; TNCS TT TNS
  19. G

    Maximum Zs values and the rule of thumb

    Hello, can someone explain to me the 'rule of thumb figure' (0.8) when calculating max Zs value's from BS7671!? Currently doing a PIR in a foundry where i measured the ambient temperature at 21 degrees at ground level, i bet you can add another 10 degree's higher up ...and that's on a good day...
  20. V

    Maximum demand and diversity

    Hello all I've got my NICEIC inspection in about 8 weeks time so i can hopefully join up with the NICEIC if all goes to plan. For the major im doing a consumer unit change at my mum and dads house ive spoke to western power they are coming out soon to fit an isolator in the line so i can...
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