max

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  1. A

    Typical Max. demand for a medium commercial premises?

    I'm doing my 2396 design project, and would like some clues about typical commercial installations, and their maximum demand and incomers. Its a large Argos style shop, I've got the max. demand at 500Amps, that could probably come down to around 400 or so with diversity, that'd give me a TP-N...
  2. Toby Kuhnert

    MAX Ze value for TT?

    Hi, I'm in my second year at college, but I'm a bit unclear on what the max Ze should be for a TT system. I know that the regs say 200ohms, and my tutor said that it would be acceptable if you found an earth rod which gave a reading of 200ohms. However several of my mates who have been qualified...
  3. F

    TT Max zs

    Hi People, Just had a friend call me asking what the max zs is for a 3 phase, c type, 60898, 40A when its on a TT supply. The supply to the board is from an rcd 300ma, he says the niceic front page in installation book says 0.46 ohms but he's getting results of 4.03 ohms. I told him as its a...
  4. marksparky

    max zs on a tt system

    hi folks was wonderin if u have a tt system with a ze of say 113ohms, and a circuit say lights with a r1+r2 of 1.33ohms, in the section on test results were it asks max zs allowed by bs7671.... the answer for a type b 6amp mcb would be 6.13. So if my zs is ze..113+ (r1+r2)1.33 =114.33 which is...
  5. I

    existing electric shower re max demand

    hi i have a 60 amp main fuse supplying 63a main switch in cu. my question is about OSG table 1b max demand figures (calculations). When applying these figures ie no diversity for shower, no diversity for first ring main it seems that any installation with a 60a main fuse cannot have a electric...
  6. A

    I was looking for some Info on Max Zs for Merlin 947-2 MCCB`s and found this

    Filling in a EICR i needed values for max Zs I looked for ages using Giggle and eventually found this link http://pws.schneider-electric.co.uk/internet/pws/literature.nsf/luAllByID/NKIY-5JUHSL/$file/MGD5032_section2.PDF/ hope it may help some folk. I may even find it again when I need it...
  7. L

    LED GU10 lighting max number per circuit , circuit design, dimmers

    Hello everyone, lately alot of customers have been asking to change there standard 50watt lv halogen spotlights for the more energy efficient LED gu10's. My question is... is there a max number of these that can be on a circuit? Previously the rule of thumb was 10 but with the loads...
    • lazy username
    • Thread
    • circuit design dimmer dimmers gu10 led lighting max number
    • Replies: 23
    • Forum: UK Electrical Forum
  8. Amp David

    Volt Drop calcs max load help.

    Looking at a job at the minute which is only for 3 IP rated double sockets down a garden. Problem is the garden is almost 35 meters long, then its another 21 meters from switch fuse in the house. Anyway, what I need to double check is when choosing cable sizes for my runs, what is best to...
  9. S

    Calculation of Max EFLI readings for type C MCCB'S

    When calculating the max earth fault loop impedance of a 3 phase MCCB that you use the nominal voltage ie in this case it is on a 60Hz system (120 / 208V ) and a 350A MCCB : therefore 208 / (350 x 10 (C type)) = 0.05 ohms Therefore Zs is required to be equal or lower than this in order for the...
  10. R

    max allowable disconnection times?

    hi guys, what is the max allowable disconnection time times under fault conditions for kitchen lighting, bedroom socket outlets and also for a shower? thanks in advnace i appreciate all your help
    • Ryan Kavanagh
    • Thread
    • disconnection disconnection times max times
    • Replies: 22
    • Forum: UK Electrical Forum
  11. J

    Tt earthing conductor max length

    Hi All, Is there a maximum length for an earthing conductor, which is connected to the earthrod in a TT installation? If so, does anybody know what the max length please?
  12. S

    Socket extension question - max amps

    This has no doubt been asked often by non electrical minded folk like me but when a socket extension says maximum 13amps, does actually that mean 4 plugs fitted with 3amp fuses like desk lamps etc (or 5a+5a+3a) or does it go by the actual amps of the equipment and you could have say 6 plugs with...
    • stoutlad
    • Thread
    • amps equipment extension fuses max question socket total watts
    • Replies: 21
    • Forum: UK Electrical Forum

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