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max

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  1. W

    max zs and non compliance

    alright guys. im just after abit of advice on where i stand with test results etc. the current project im working on requires the installation of 10mm swa backed up by a 50a breaker. now ive noticed alot of the jobs i do, the Ze doesnt meet the recomendations for the type of system, usually...
  2. Toby Kuhnert

    Max disconnection times for 50a shower circuit ?

    Hi guys, Just doing an EIC for a recent dis board change, I also installed a 50a (type b 60898) shower circuit for an 11.5KW shower. I am looking through my regs trying to find whether it comes under the 5s disconnection time...? I know 0.4s is for circuits less than 32A and non-distribution...
  3. P

    max zs of large fuses

    BS7671 tables only go to certain size fuses eg how can I find max ZS of 400 amp BS88 - 2 on niceic test sheets they ask for a max value out of regs table I have only managed to find a busman fuse chart which differs been told by employer to use these values on sheets any input would help thanks
  4. P

    max zs of large fuses

    BS7671 tables only go to certain size fuses eg how can I find max ZS of 400 amp BS88 - 2 on niceic test sheets they ask for a max value out of regs table I have only managed to find a busman fuse chart which differs been told by employer to use these values on sheets any input would help thanks
  5. Eggster71

    Max PFC gone through the roof....Ideas anyone?

    I've been doing Periodics/ EICRs on some flats for a fella for the last 6 or 7 years, all ok, with the usual small faults, switchline IDs etc. This time though, following some "repairs" that were done in the road a few months ago the max measured PFC has jumped from between 1.7 and 2.8 right up...
  6. N

    Max length of run?

    Can anyone help with this..2500w of panels. 6mm cable. Max length of run?
  7. F

    Max Zs for mistibushi mccbs

    Hi guys can anybody point me in the direction of a website or table that will give me the max Zs values for mistibushi 60947-2 mccbs cheers
  8. F

    mistibushi 60947-2 max Zs

    Hi guys I'm looking for the max Zs values on the mistibushi bs 60947-2 mccb,s could some one point me towards a website with these tables please I have tried the single cable option on the amtech soft ware but its not available cheers guys
  9. J

    solar max mt 10

    Hi all, I've got a problem with a 20kw system in Hertfordshire. System is split into 4 strings over 2 10kw inverters. 1 inverter is showing DC insulation fault, I have had a look at the manual which says - the insulation resistance of the Pv generator against earth is too low. It then goes to...
  10. B

    max zs with rcbos and rcd spurs

    Hi Everyone I was just wondering if anyone knew more about maximum zs readingsa for rcbos if say you have 1. a type C 16AMP bs 61009 rcbo 30ma is the maximum zs 0.92ohm OR IS IT 1667ohm 2. if the circuit came straight from db ran to an rcd spur 30ma protected by a bs 60898 B 16 amp mcb which...
  11. D

    Max demand and diversity

    Looking for some assistance here, been asked to calculate the max demand and diversity for the supply authority who are installing new main armour to a domestic building which I am rewiring. When calculating the max demand do I use current rating of the circuit breakers for the individual...
  12. G

    Micc cable max load

    Hi all can anyone help I'm working on a 3 bed bungalow the incoming supply is pme'd in a garage over 30 meters away from the property and the ccu is in the house which is being fed by a 4 mm micc/pyro from the garage. What is the max load for this type cable thanks mike
  13. S

    solar max inverters

    Been recommended a solar max inverter for a 5kw installation, does anyone have any experience of solar max/horror stories or are they sound?
  14. A

    9kw electric Boiler and max demand

    Sorry to bring this up, I've searched through some of the old stuff, but would like a bit of reassurance... Been asked to install a 9KW electric boiler with immersion circuit for the cylinder. I couldn't see the main cut out as it was beleive to be in a different flat, so of course I will need...
  15. P

    0.05 Max Impedance for Main Bonding Conductor

    Got massively ribbed on another post for not knowing that max impedance for a main bonding conductor is 0.05 ohms, so I expect some more for this post!....... I'm going to assume there is a very simple answer for this, but despite me going blind reading GN8 I can't for the life of me work out...
  16. B

    max main bond length

    Hello people Doing cu change , TNCS, upgrading bonding , the gas is other side of house , cu in double garage had to take cable up into bedroom above in trunking and then across loft down external wall i conduit into gas meter box and bond there. When measured route it came to abouty 25m but...
  17. Z

    Max Zs value for TT distribution circuit (NOT Final circuit!)

    Apologies if this question sounds a bit basic but am a little confused at the mo and quite new to the game. Here goes - I am trying to complete a NICEIC Highway Installation Certificate for a system where there is a 230 v TT supply coming into a roadside pillar into the main BS88 fused head...
  18. mwigham85

    Crabtree C50 max zs

    I recently asked what the max zs would be for a Crabtree C50 7.5a breaker and didn't find the answer but if any one else ever needs to know here's a formula take the breaker rating 5,7.5,10 etc multiply by ( 4 for type1) (7 for type 2) and (10 for type 3) then divide 230v by that value...
  19. S

    Max Measured Zs

    Hi All On the test cert I have it asks for max "Measured" Zs. With my megger 1552 I can do this at socket outlets using the no trip loop test and the plug lead. On a radial circuit what lead combo do I need to use? I'm guessing its a 3 lead test on L N E at the furthest point of the circuit...
  20. J

    Max demand problem

    First post - be gentle. Just changed a consumer unit and am struggling with the "max demand" bit on the paperwork. RCD is 100A, Main fuse is 100A, it has 2 showers (50 A each) no diversity allowed on showers. so, um, not much room for anything else. .....or am I being a moron? Thanks Jim

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