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Hello, i have a question for you all, I have narrowed it down to 1MCB that everytime it is switched on, it trips the RCD, I unplugged everything on the circuit what else could be causing that RCD to trip? Thanks.

i did a normal apprenticeship, ye, you use P= v*i or i = P/V, to fine watts to amps is that right?? I=P/V, 12000/230= 52amps is this right?

so why is this right! and not the other one then could somebody explain?!

Off course i am bothered!, i have decided not to do the job but i am still keen to learn how this is done please.

well i cant see which one is wrong, could you tell me? and i am sorry like, i was only questions as i really want to learn.

well im only trying to learn the trade properly!, and any help would be much appreciated, If i was told how to calculate the size of the cable and the breaker needed i would be able to do it. but i am wanting to learn how to calculate it. thanks

why cant you tell me the answer instead of being ignorant! you forget you have been here yourself!!

well how else am i supposed to learn when people wont help and understand that they were once upon a time in the same place i am just now, as i keep saying i want to learn, but cant get the experience as there is no work! so im trying my best to learn! anybody help!

All you's ever do on here is moan at people for not knowing the answer!! you all expect everyone to have 15 years experience behind them n know everything!! You forget about the others who are only just qualified, and cant get any work, and are trying there best to get experience! so...

jesus christ what is it with people these days!! I know im only qualified and all! but how is anybody supposed to get experience when everybody just thinks you should know everything!! So can anybody give me the answer?

so is it 26.81 or 46.25 amps?

so is it 45 amps or 27amps per phase then?

I think thats wrong?? isnt the other way right that was done up there?

ah ye,sorry i meant to say PVC singles!

Ye, that sounds good, but im wondering what it would be for PVC twin and earth?

So do you get the cable size from the Size of the MCB, or the Design current the actual circuit is pulling?

why 4mm cable? how do you work out the cable size? do you base it on the MCB size, or the current the circuit pulls?