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maximum

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  1. G

    Maximum demand

    Hi, A while ago I remember somebody mentioning a quick way of working out max demand with out doing it properly and it came out roughly the same as if you work it all out. It was something like add up add the rcb's and divide by 4 or something. Anybody know what I am on about or was is this...
  2. J

    confused

    Hi Guys New guy here can someone advise me what is the maximum earth continuity reading allowable on a lighting circuit which is protected by a 5 amp fuse and has about 100 mts of 1.5mm T&E utilised
  3. D

    EFL on TN-S with RCD

    I'm doing 30mA & 100mA RCD resting on a TN-S system TN-S earth fault loop impedance max is .8 ohms TT earth fault loop impedance max is 200 ohms Regs state approx 1500 ohms for RCD on TT system What should the maximum Zs be on a TN-S system when testing an RCD?
  4. sythai

    Maximum Demand... 3phase

    Looking at job this week, involving fair bit of additional 3phase equipment... Just wondering how to go about calculating maximum demand + diversity for this ? Any Ideas please?
  5. V

    Maximum Cable Length??

    can someone please help me with this question There is a 40A BS88 fuse, protecting a 10mm cable with a 4mm Earth, it is wired to Reference method C, supply is TNS and it is protected by a 30mA RCD. What is the maximum length the cable can be? (thats all the info i have! I haven't been to...
  6. V

    Maximum Cable Length!

    can someone please help me with this question There is a 40A BS88 fuse, protecting a 10mm cable with a 4mm Earth, it is wired to Reference method C, supply is TNS and it is protected by a 30mA RCD. What is the maximum length the cable can be? (thats all the info i have! I haven't been to...
  7. N

    Voltage Drop

    We are all familiar with the requirements for measuring Zs and verifying that it is within the limits for the particular type of protective device. I use a single guide of 1.2 ohms as the maximum though there are of course many variations. What we (I) have not been noting is (R1+ Rn) and the...
  8. H

    maximum Zs

    for a TT system in domestic house with 0.2 disconnection time, with either mcbs or fuses. do i use the max Zs values in Tables 41.2- 41.4 which have 0.4 and 5 s disconnection times ? obviously depending on type of circuit.
  9. D

    Maximum Demand Load (Certs)

    Hi guys, ready for it yet another blonde moment from me, trying to get my head round my training. Regarding Maximum Demand load Amp/kA on the certificate If you have an existing installation you can measure the maximum demand load by by switching almost everything on the circuits and...
  10. Golden_Boy

    Voltage Drop

    Why all the complicated formulea for working out voltage drop? Why not just connect the load and measure the voltage with a meter?:confused:
  11. R

    hey guys continuity testing

    hey guys i am studying for my C&G level 3 and i have my practical inspection and testing next week and i cant find anywhere thae values that are aceptable when you read continuity on a lighting circuit for instances and they havent told us at college i presume it is somethning to do with the...
  12. O

    swiched fused isolator

    just doing a re wire and repositioning CU, a friend of mine told me that i would have to fit a fused isolator to the tails, is this correct
  13. C

    Maximum length of Main Bonding

    I did find the answer pretty much to this in an old thread & was answered by Chris... But wonder if I could get a few more suggestions as to being correct. Installed a Main Water Bond from a DB Board to the Main Incoming water supply which was (in my opinion) well over 25m away. We ran it along...
  14. C

    Maximum number of conductors in MCB for radial circuit?

    I can't find anything in the regs. On a ring it's fine to run a spur from the MCB (so 3x2.5mm). On a radial technically it doesn't matter where connections are made to the circuit as long as the cable at any given position can withstand the load. So how many connections from the MCB would be...
  15. madeinengland

    maximum demand.

    i have my 2392 practical coming up.i'm fairly confident of the testing to be done on the board. the problem i'm gonna have is the three certificates to fill in. schedule of tests i'm fine with. schedule and inspections i'm ok with. but the certificate itself i haven't even seen and we've been...
  16. S

    rcd

    can anyone explain what is the rating for on a rcd device not the 30ma but te 63amp or 80amp. im a little confused as they dont provide overcurrent protection. cheers
  17. E

    Whats maximum allowable length of tails from meter to CU

    Hi all , Is there a maximum length for domestic meter tails ? I have a friend who wants to move his consumer unit to a different position without the expense of paying for the meter to be moved. Just wondered if the c.s.a. of the meter tails is spec'd correctley and protected is there a...
  18. J

    Maximum Cable Length

    Ok. I've been trying to get my head round this all day but I'm getting nowhere. On page 45 of the OSG (Table 7.1) it says the maximum length of a lighting circuit wired in 1.5/1.0 cable on a 6 amp Type B MCB is 90 meters. However, working out the voltage drop for this length of cable I'm...

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