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  1. 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...
  2. 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
  3. 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...
    • coatesykid
    • Thread
    • demand maximum rating rcd
    • Replies: 21
    • Forum: UK Electrical Forum
  4. 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...
  5. 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...
  6. 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...
    • mick525
    • Thread
    • aus calculate maximum temperature values
    • Replies: 15
    • Forum: Australia
  7. 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...
    • 1shortcircuit
    • Thread
    • aus demand fuse highest lighting lights maximum recorded what's you've
    • Replies: 10
    • Forum: Australia
  8. 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...
    • kazek
    • Thread
    • 3 phase aus maximum phase total
    • Replies: 1
    • Forum: Australia
  9. 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...
  10. 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
  11. 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...
    • schoe
    • Thread
    • aus diversity help maximum
    • Replies: 3
    • Forum: Australia
  12. 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...
  13. 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...
  14. 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
  15. R

    Maximum length for BT

    Hello, We have had a log cabin for my better half to run her company from. All wired ect, but she now needs a BT point for a Card machine. As the crow flys it's about 35 - 40 meters from the master, which is the only point in the property. Is there a maximum distance specified by BT after...
    • Richard
    • Thread
    • aus length maximum
    • Replies: 9
    • Forum: Australia
  16. S

    Excessive Maximum Demand and Applying Diversity

    Dear all I have been asked to quote for some work at a property and am concerned at the maximum demand already present without me actually adding to it. I would therefore welcome any thoughts on just how much diversity I can apply. The consumer unit currently has ten circuits as...
    • sherratts
    • Thread
    • applying aus demand diversity maximum
    • Replies: 28
    • Forum: Australia
  17. B

    Maximum Demand on PV Install?

    What value do I put in the maximum demand box on NIC Installation certificate? The system in question is 2.4 kWp fed into a dedicated consumer unit (garage unit) Any help would be appreciated.
  18. G

    Maximum Demand and diversity

    I'm currently doing a project on a service station for college I need to work out maximum demand for 3phase 0.5kw motor circuit with power factor of 0.8 and efficiancy of 95% Can any one help point me in the right direction of how to work this out???
    • gazmck
    • Thread
    • aus demand diversity maximum
    • Replies: 2
    • Forum: Australia
  19. R

    maximum demand on a EIC for an extension

    when filling in the test cert for a new extension ( 4 circuits ) Do you have to fill in the max demand for the whole installation or just the work you carried out and tested?
    • Ross1
    • Thread
    • aus demand eic extension maximum
    • Replies: 1
    • Forum: Australia
  20. A

    maximum zs

    What table do I use in the on site guide to find the maximum Zs for a TT sytems? My Ze is 3.61 so they all be over anyway?
    • Andy B
    • Thread
    • aus maximum
    • Replies: 45
    • Forum: Australia

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