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maximum

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  1. T

    Ze at its Maximum Measurement

    If the Ze on a TNS supply is measured at 0.8ohms, is this still acceptable? Technically it is bang on the maximum. DB is 100A Main Switch with 30mA RCBO's on all circuits.
  2. G

    maximum residual current RCD

    Hi Everyone, I would like to confirm a question I saw the other day regarding working out the residual current on an RCD The question was similar to the following An earth electrode has been measured and the following readings were taken 1) 21 Ohms 2) 21.02 Ohms 3) 20.8 Ohms What is the...
  3. Y

    Maximum Current Capacity

    How much current capacity can handle in a 16 sq. Mm. Wire size in ac 415 volt supply? Because i have 2 pump motors that will connect to a power source of 415 volts ac 3 phase; 1 motor is 5.5kilowatts and another one is 7.5kilowatts. Both motors will run intermittently and supplying different...
  4. U

    Maximum zs generator and rubber box

    Can anyone point me in the right direction. I am working for a company who do temp power for welders etc from a generator. We have been given a load of new boards to pre check befor they go on site. Powerlock connectors in and then D63 on a commando sockets. I have put the maximum zs of...
  5. T

    DCP 161 implementation April 1st and calculating KVA, maximum demand

    I have alluded to this in previous threads. The commercial site I work on has asked me what I think the total KVA for the site is. Having looked at various ways of viewing this I am getting lost with it. So if I just say kVA = ( V*A*1.73)/1000 and assume supply is 400V and take the main incomer...
  6. soms

    Maximum permitted Zs values for circuits with TT earthing system

    Hello, I am assisting my supervisor and getting some first hand experience of completing certification by filling in an electronic copy of an EIC, working from a handwritten circuit schedule with test results and my memories of the installation work. I am at home so cannot ask him for advice...
  7. B

    Maximum age of wiring

    Hello, I live in a house where part of the wiring dates to 1960 (exact). Now I know after ~30 years old, a rewire is advised. And at 58 years it should definitely be rewired, but it's going to be difficult to convince my parents to have the house rewired soon - as we have 5 people living here...
  8. E

    maximum allowable height for scaffold tower?

    really trying to get the customer to see sense, they have supplied scaffold tower for lighting replacement about 5metres off the ground, which i have been pottering away at with this shitty scaffold tower getting stuck in the sand below and hitting against the beams of the shed itself almost...
  9. D

    16 amp commando sockets. 20 amp mcb on site guide as maximum value mcb

    Hello the on site guide lists 20 amp maximum mcb for 16 amps sockets. Having a debate with someone as to why this is? Why not 16amp mcb? I installed 20 amp mcb as it's for a car charger that charger's at 16amps for 8 hours and is not capable of pulling more than 16 amps but this has been pulled...
  10. G

    Help with Maximum Demand needed

    Hi, I am studying to become an electrician. I got a question wrong on a practice test. Can anyone help me understand maximum demand. this is the question I got wrong..... Question 27: With reference to the nature of the supply, which one of the following can be determined by calculation...
  11. A

    Maximum distance between collectors and tank?

    Hi, I'm looking at installing a solar water system for a friend. He runs a B&B so has much higher hot water needs during the summer, and also a very high annual bill for heating and water. So it seems like he's ideally suited for a solar thermal system to at least reduce the costs. We live in...
  12. W

    Zs ohms with maximum rcd ohms

    If the maximum zs is okay up until 1667 ohms protected by a rcd why do we care about maximum disconnection times for the mcbs e.g why do we test and it's important to meet 1.37 or 1.1 zs on a 32 amp circuit
  13. J

    28A in 4mm cable 6.5kw hob

    i need to wire in an induction hob which is 6.5kw and the cable already chased in is 4mm and would be a real pain to replace for a bigger. I just wanted to know if it would be alright or play it safe with a 6mm?
  14. D

    Maximum Demand Installation

    Evening all. At the risk of being ridiculed I wonder if someone can clarify something for me! On the initial inspection forms for installations there is a box for "maximum Demand". This can be in KVA or amps. I've been told that you add all the breakers on the board up then it is 40% of this...
  15. S

    Maximum breaker size for DB (solar PV)

    Hi, Can anyone point me in the direction of the regulation / code for the max solar MCB size when connecting into a spare way of a local distribution board ? Eg. Is it possible to connect a 100A breaker into a 100A board ?
  16. Cadgey123

    DNO maximum demand message.

    Just started doing my first block of flats as a Qualified supervisor. I have 5 flats and a landlords supply to wire up. Done my calculations a while back and told the DNO I would need require ADMD of 12.5 kva for each flat which I thought was reasonable, Considering I have 3 rings, 2...
  17. L

    R1+R2 Values

    Hi all, Quick question when doing r1+r2 testing wether its a new install or a EICR, is there a table to show maximum readings we should be getting? Or is it a calculation? Thanks in advance Luke
  18. snipersmith87

    LED volt drop- maximum LEDS on 6amp??

    First post all so go easy lads.... What's people's views on maximum amount of LEDS on a 6amp mcb lighting circuits?? 6w LED GU10s throughout. Wired in 1mm twin and earth. Maximum cable runs??? Nearly every spark I speak to has a different verdict. Should we still be considering if 50w halogens...
  19. kingeri

    Maximum demand

    So now what's the feeling these days on working out maximum demand for domestics, the OSG method has to go out of the window surely, with more and more division of circuits going on. I have been pondering my latest job, very nice but older installation done by an old electrical engineer...
  20. B

    Maximum disconnection times

    Hi does anyone know max disconnection times on tn-s system for: 16A radial 6A lights 32A distribution Cheers

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