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maximum

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  1. B

    Maximum ZS Chart please??

    was wondering if anyone had a chart, table, list or anything of the sort stating maximum permitted ZS measured for breaker types, ratings and ka ratings? thanks, Ben
  2. A

    maximum Zs

    Hi all Just new to testing and inspection so can you help me. When you need the maximum Zs for a circuit do you use the overcurrent device for the entire installation(ie bs 88 cartridge fuse) or would you use the breaker for the individual circuit when using the tables in the on site guard to...
  3. S

    Maximum demand

    Still at work as I'm doing this post come across a 80amp kmf 16 mm mains t&e on a 4 bed hse 15mtrs long clipped direct no insulation round it to db. Anyone want to work it out?
  4. S

    Maximum Cable Run Question.

    Hello all, Im not an electrician or really have much background in electrical theory but I was Just wondering if someone could show me how I would go about answering the following question. A power ring is to be installed using a 2.5mm twin and earth PVC cable. The circuit will be protected by...
  5. D

    after diversity maximum demand

    I have been asked by the DNO to give the ADMD figures for a building that is being converted in to 8 flats in conjunction with electric power and gas heating. I have looked everywhere for a ADMD meaning but cant find one, has anyone ever heard of this??? Cheers, Debs (yes female electrician)
  6. M

    R2 Testing Help

    Hello i havent done much testing before so i am trying to brush up on my Testing skills before i join Elecsa, i have a couple of questions about R2 testing please. I understand how to carry out R1 R2 tests using method 1 and that we do them to calculate the Zs of our circuit Zs=Ze+R1+R2 But i...
  7. I

    Am i wrongly calculating my maximum demand?

    Hi guys i calculating my expected maximum demand for an installation to see if the 60A cut out will handle it. heres what will go in and calculations incl diversity 2X 32A Rings, so 32A(first ring) + 12.8A (40% all others) 1X 6A lighting, so 4A (66%) 1X10A lighting, so 7A 1X32A Shower, so 32A...
  8. tank

    110v transformers

    hello all, does anybody know what sort of power factor 110v transformers deal with. would it be a standard 0.85? i want to know what kw output i'd get out of a 3.3kva tranny before i buy it. ta
  9. C

    RCD Rating

    Can someone please explain to me how the Rating of RCD work because I've read on different forums that you can not exceed the rating of the RCD ie 63A or 80A if that's the case why do C.U like 10 way dual RCD, have a total MCB rating of 218 A if all MCB was used and only 143 total A for the...
  10. F

    Maximum ZS???

    Hi there, Im trying to make sure that i understand my maximum ZS value table correctly and would greatly appreciate your help. So for example is the maximum ZS for a given circuit (not the installation as a whole) based on the device rating, type and figure given in the appropriate table? so a...
  11. V

    inspection & test, disconection times & maximum zs allowed

    Hi, on a tn system, 238vs, would the disconnection time be 0.4s or 0.2s, i thought as over 230vs it should be 0.2s, but working with another engineer who disdagreed & pointed out tables in bs7671 show 0.4s to 5s? Also when completing certs should you include the 80% or not in the maximum...
  12. M

    How to calculate temperature adjusted maximum Zs values

    Hello, I have my practical 2391 test on Friday and have been told by the examiner that we will be required to complete the calcuation for the maximum operating temperature for Zs. I am unsuse what to do with the calculation. From guidance notes three (second example down, pg 113), it...
  13. 1

    What's the highest you've recorded for a 100A fuse?

    Yes Maximum Demand again lol I just tried to make the title a little more curious to get people to look ;) Just playing with some maximum demand figures, started with 226A and got it down to 104.65A Just wondering what id the highest figure you have recorded for a 100A fuse? Is it actually...
  14. K

    3 phase sunbed

    Hi all Can you please help me with the below: i have 5 sunbeds thats 13KW per bed so 65KW in total (all 3 phase) + lighting, sockets etc all approx 3KW(SINGLE PHASE) Total of 68KW I need help with calculating total maximum power in kVA that i need for the above I tried to calculate it...
  15. G

    regs for Maximum supply cable lenght between the main supply and a protective device

    Is anyone aware of any UK regs that describe the maximum length of a supply cable between the main supply and a protective device such as an RCD in an industrial installation? I ask this because I have come across what I am sure is a dangerous installation at work but need the regs to back me...
  16. K

    Date of next inspection?

    Alright everyone can someone please tell me the recommended date of the next inspection on a new domestic cu install is it 5 years? Ive looked in regs and onsite guide and cant seem to find it thanks
  17. S

    Maximum diversity help

    Hi all I'm struggling a bit with the calculations for max diversity on lighting circuits using the 66% of total current demand. Could someone help me work these out Three circuits 17 x 50 watts = 850 divided 230 x 66 - 243 10 x 50 watts = 500 divided 230 x 66 - 143 5 x 50 watts = 250...
  18. P

    How to work out TIC!!!

    Hi Given that... Total Installed Capacity (TIC) is the maximum capacity at which an Eligible Installation could be operated for a sustained period without causing damage to it (assuming the Eligible Low-carbon Energy Source was available to it without interruption), a declaration of which is...
  19. silver surfer

    Lighting circuit max cpd

    BRB 559.6.1.6 refers to lighting circuits incorporating lampholders beiong protected by a max overcurrent device of 16A. But what about lighting circuits that dont incorporate lampholders, such as plug in ceiling rose arrangements feeding fluors or lay in grid fittings for example? Can anyone...
  20. B

    Maximum length of Schuco rails before sliding joint

    What is the maximum length you can have of Schuco rail before you need a sliding rather than a fixed rail connector? I am sure I have seen it before in one of the manuals but cannot find it now. Thanks Regards Bruce

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