Many moons ago - when Eddison was a lad it was acceptable to measure R1+R2 (and the Zs) at the switch. However the few milliohms that you end up not measuring can prove to be vital when taking the safety of persons and 'livestock' and property into account.Guiness DrinkGuiness DrinkGuiness Drinkjust been looking through my osg at the testing section.. shows a picture of checking r1+r2 of a lighting circuit at the switch.i was told at college to do it at the pendant.....am i missing something?
cheers
Do the maths then! It aint hard buy a calculator from tesco'shave you ever tried measuring Zs at a ceiling rose with a 3 lead tester,its well dodgy,Guiness Drink
With a bog standard pendant & rose its not too bad...have you ever tried measuring Zs at a ceiling rose with a 3 lead tester,its well dodgy,Guiness Drink
Spose the Two key points arejust been looking through my osg at the testing section.. shows a picture of checking r1+r2 of a lighting circuit at the switch.i was told at college to do it at the pendant.....am i missing something?
cheers
Don't them 4pin types have a choke or somthing in the fitting?Have seen these lamp test connection units and they do look good, however i didn't see one for a low energy pendant fitting eg. lep18s, the 4 pin PL type lamp. Now that all properties must have a percentage of low energy fittings , seems the old bc lamp tester may go out of fashion .Macca
Guiness Drink
SL you know your right...Don't them 4pin types have a choke or somthing in the fitting?so there is not a direct R1 connection?
or have I missed somthing?? ?:| :|
I do now!SL you know your right...Thats why i haven't seen them...
Macca
Guiness Drink
And the switch is one of the many furthest parts of a circuit, and what if more than one cable has left the breaker (that's another discussion) or the circuit has been 'spider-ed'R1+R2 (and Zs) should always be measured at the furthest point of the circuit. the only exclusion from this is Zs - which can be calculated instead of measured.Guiness DrinkGuiness Drink Hic
How do you think you could justify issuing a MWC on a CU change?????is the sw/wire at the light fitting not the farthest point. if you go to a job with more than one cable at the breaker then id measure the one thats supplying your circuit and if replacing cu put it on its own breaker. (mayeb put a note on minor works?)if its spidered then your never really gonna know about it so you just use common sense i reckon?
OK. Sorry, it didn`t read lioke that ( to me, anyway). Didn`t want anyone thinking they could do CU & issue Minori wasnt talking about a minor for a consumer change. the "put a note on minor works" is applying to the point that 2 circuits are fed from one mcb, which i would insert "a note" on a minor and on dic cert
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