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DESL thanks,i have a small idea of Bs 7671 im doing a city + guilds night course,our regs are similiar but different,some times its handy to know the different ways as this can lead to better workmanship

I understand what your saying but i know nothing bout cars either but i could pretend and talk rubbish to you but that wouldnt make me right in what im sayin Im an apprentice ,if i was never to inquire or try things i didnt fully understand i still be bearing back T+E for sockets till im 45...

Forget it :x Is this a forum to get help and learn or is it a place to be ridiculed :roll: i dont want or need help from someone that looks down their nose so quickly

Hi just wondering bout a senario that i could be up against soon. Ive to upgrade a fuse board to a new one(needs a rewire but that ll be later) the system is TT i think after the MSF can i just use an rcd 30ma on the sockets or does the whole installation need to be protected by a certain...

Rep of Ireland was never really part of the uk !!

In the meters there is a terminal for the connection of a 10mm earth to the neutral of the supply.So you have live neutral and 10 earth tails going to board from the suppliers meter cabinet we are not modifying the system thts the way its intended.Im just a plain old spark (apprentice) no...

Is tncs the same as pme do you need an earth rod driven into the ground as back up for the above This might sound stupid but when we wire houses they are supplied with a concetric cable we put in a neutralising link as usaul,but recently we wired a commercial unit,bein supplied with three...

Hi i was scouring the web for ifoon generators and found this article http://www.deir.qld.gov.au/electricalsafety/livingaroundelectricity/generator/general/index.htm Could a neighbour be supplied (or hurt) from your generator if the power went down,you plugged a genny into your socket...

If you have a non maintained emergency light system what current would they use when they are not in use,by this i mean when the battery is charging off the mains and your supply is in normal operation.Would you have to take them into consideration as a proper load or is it it neligible I...

Why is it neccasary to remove equipitential bonding when doing a test on Ze Is it true that you can leave them connected for final circuits inside a house this is the way we do it at work !!!!

Hi would you hafta derate a switch if you were switching one high bay 250watt son light or two maybe

Thanks alot ,sometimes you need to hear (or read) someone say it before it makes sense

Am i right in thinking that fault currnts in tn cs systems would be alot higher since the impedance is alot lower but this in turn should activate your protective devices alot faster ( or whatever times their rated for)In the uk what is aceptable efli for tncs domestic house By the way...

so in a tt system say you had a 32 amp mcb which had a load wired to it that was leaking current to earth but the mass of earth had a high impedance which kept the fault current below the mcb rating.The mcb would not trip ,it has a fault current but is not enough for the mcb to detect...

Could any body help me im stumped.Im in ireland and im doin a city guilds course B im not worried bout the tiny differences between our irish regs and the iee regs but i wanna know whats an exceptable earth fault loop impedance what would be too much in a tncs or tt system houses. regs say...

Thanks for the replies i know im in ireland but i just wanted a technical idea of what would happen,obviously your not permitted by the rules to do it here either

What problems and hazards would you cause if you installed your own PEN conductor into a TT system not that im thinking bout it by the way (am i right to think TNCS is just like TT but with a link from earth to neutral in the cabinet)

If you were usin the non maintained fittings and the light only came on when the power went off ,surely you wouldnt pull much of a load during normal operation,would it be just topping up the battery due to the battery discharging over time

E M E R G E N C Y L I G H T S :x You know those bright things that come on when the power goes

I never terminated emergency lights back at the DB but i put them up.I wanna know do you use a contactor for them and what kinda batteries would you use for a central battery system(do you install an individual cabinet).If anyone could give me a link or something even i would appreciate it