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  1. gazdkw82

    Maximum Zs values for BS3871

    Where can I find the max Z's value for a BS3871, type 3, 32A MCB? Iv had a look through BS7671 and done some searching online but I cannot find it. IV found some tables with listed Zs values for a 3871 but I have no idea where they originate from or how old
  2. Lekky1

    Exceeded max demand questions

    Hi guys, I have been asked to fit a ring main in a utility room currently being built with a outside socket and a lighting circuit with 4 led lamps and a outdoor light, this much I am comfortable with. My issue is with the max demand, The current consumer unit is loaded to the max with 212amp...
  3. haptism

    Varilight Dimmer max loading

    Hi, hope someone can advise. Ive just called Varilight helpline in regards to max loadings on their 300w trailing edge LED single gang dimmer. They tell me that I can have a maximum of x30 10w leds on the dimmer. Most info out there regarding dimming LED suggests to divide the dimmers wattage...
  4. D

    Max Zs on certification

    Please can people clarify what value they insert in the Max Zs field on certification. I've always input 100%. Currently in disagreement with another person as they are specifying 80%. Done my 2391 in 2008 and I was taught and told it's always 100% and it's down to the QS to interpret the...
  5. J

    max demand for 12x all elec flats

    starting 12x flats next week that will be all elec -with a rather juicy electric boiler (12kw)- havn't won the intake/communal work yet- but just doing my pricing for it ready does my maths look good for working out the max demand and kva of main supply- currently it is only 100a TPN so around...
  6. oxford 12

    Stanley fat max technicians tote

    Has anyone got a decent used one for sale?. Looking for a replacement
  7. D

    MAX LOAD FOR DOUBLE UK DOMESTIC 3 PIN SOCKET?

    Hi With a standard 13 amp domestic uk 3 pin socket the max load is 13 amps i believe?. So does this mean that a DOUBLE socket would have a max load of 26 amps....OR is a double socket still only 13 amps?. In one part of the double socket i have ( on a 3 way adapter) a tv, a blu ray player and a...
  8. C

    New member needing help with commercial max demand

    hi I’m new to this site. Need help with max demand and diversity of a large catering trailer. Thanks
  9. Zdb

    Max Zs values. (20 characters)

    So I've been told by the NICEIC not to use the 80% rule for max Zs (even though that's the table provided on the inside of the cert books). They want me to use the 100% values from table 41.3 in the BYB. Not a problem. However I can't seem to find a table for the BS EN 3871 MCB's in there...
  10. 8

    Max length of meter tails

    Ive been asked to look at the electrical installation at a large 5 bed property with an attached annexe that the owners are converting into a 2 bed holiday let. There's one supply cable that comes into the annexe for the entire property . This is currently routed via a single meter to a CU . 2...
  11. C

    Where to get Mira Sport Max 10.8

    Evening, I want to change my shower this weekend to a Mira Sport Max 10.8kW. It’s the airboost one. Does anyone know where I can get one for a good price please? Thanks.
  12. HappyHippyDad

    Max demand for a 2 x 3kw immersion heater?

    Evening all.. I was at a job today and the plumber asked me to fit a supply for a 2 x 3kw immersion heater. I have asked him to send the model number so I can check the MI but have not heard from him. I will be returning tomorrow to carry out the job. I expect it is something like...
  13. Dave301

    Max demand for Caravan site

    Hi there, Looking for some advice with a new caravan park. There will be 25 plots for static with a potential 15 being added in the future. SP Energy have quoted to supply 150KVA 3phase. Now I work that out to be 216A but will that be per phase. And also does anyone know where I might find...
  14. D

    Max amps from UK socket

    I have been told I can use a 30Amp welder from a normal UK socket. But I have seen numerous posts that say 13amp is max from single socket and 20AMP is max from double socket: I must be missing a trick. Some internet postings below. "Double sockets are rated for 20A draw, over this long term...
  15. C

    New Member with an EICR question on max Ze reading

    Afternoon Ladies & Gents, I'm a new member to the forum so thought I'd introduce myself. Been qualified for around 10 years and have finally set up on my own. I am new to the test and inspection side of things so I am seeking advise on the following question. Any help would be greatly...
  16. D

    Max demand Help needed please

    Hi I have an assignment to complete and it's asking for max demand before diversity and max demand with diversity, I'm basically stuck on how to work it out. Any help is appreciated I have about 30-35 circuits
  17. M

    Max Zs for Bs88-2 630amp fuse

    hi can anyone help I have a 3 phase bussbar protected by BS 88-2 fuses rated at 630 amps I need to know what is the max Zs allowed for this ?
  18. D

    CPC Size & Max Permitted Zs

    Looking through our periodic certificate that was completed by a 3rd party, I've got a few queries that hopefully someone on here can clarify. We've got a Schneider Prisma switchboard (S3/MSP 3.1) fed from 11kV/400V Transformer. - What is meant by MW for cpc size of 2/TP and 13/TP? - Is there...
  19. J

    max demand for flats

    Just double checking calcs if anyone bored! So for a block of 3 flats with no gas services- all flats same. +communal stairs over 2 floors (LED light few small panel heaters) Flat: Kitchen Ring (32a) (32) Ring (32a) (12.8) Oven (20a) (13) Hob (32a) (16.6) Immersion (16a) (16) Lights1 (6a)...
  20. A

    Max Zs table

    hi folks, does anyone have a copy or link to the most recent maz zs tables? ive only got green book and know they've been updated, was it 10% extra roughly. i used to have a link saved on my phone but i must have deleted it by mistake, thanks.

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