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Three phase 4 wire supply from a three phase triple CB to that board and the Red phase going to another board

The Switches are rated for 400V

Hi, I am training to become and electrician, I have passed my C&G level 2 exams. I am working as an electrical improver. I came across a consumer unit today, which has two main switches and two phases L2 and L3 supplying it. Is this board to regs? Can you take 2 phases to a consumer unit?

He said a ring final circuit is wired in parallel. It makes no sense to teach a ring final circuit is wired in parallel and a radial circuit is wired in series. The terms parallel and series have specific meanings in respect to electrical wiring. It would be confusing to say a radial circuit...

He said a Radial circuit is wired in series. It is not, it is wired in parallel. I have left my notes at college, I was going to share all the other c**p  he taught us today but I don't have my notes to hand :(

Our tutor told us this is how we should wire a radial circuit. With that extra earth wire???????????????????

Thank you I can't believe our tutor told us there were wired in series, when i challenged him he said i was wrong. Unbelievable

That could be the confusion. Not on my part though, on the tutors part. I challenged about 10 questions, I have them here with me. I think I was right on all 10 questions and they said I was wrong. I can't believe the tutor told the class a radial circuit is wired in series and then said i was...

thank you :)

Hi, I am a trainee electrician. On my course today I was told a Radial circuit is wired as a serial circuit and a ring final circuit is wired as a parallel circuit. This makes no sense, surly they are both parallel circuits. Can somebody please give me a sanity check and tell me I am right...

Not on TT, it was a TN-C-S system. 100 amps would trip an MCB but i don't think it would trip in 0.4 seconds. Would it not need 160A to trip in 0.4 seconds on a type B MCB. 32 x 5 = 160. The bimetallic strip would trigger the trip in a short time, not sure how long it would take the solenoid to...

Thank you Doc, Thank you for taking the time to write this and for your advise. I will always check  Earth, bonding, polarity and Ze first in future on every installation I work on. Much appreciated :)

One question, if a nail did bridge line and earth, would earth gain the same potential as the line?

Yes I have a copy of guidance note 3, I have read it. I will re-read it again too. Maybe the electricians I am working with are not good at fault finding. They are good electricians though I am glad i joined this forum. Started me off on a good foot. I will follow the testing procedure by the...

Sorry you are correct, impedance accounts for capacitance and inductance and is the correct word to use when talking about AC circuits

I now see the importance of following the test sequence, and I now understand what people were trying to tell me all along. I feel very foolish. Thank you for explaining this to me in such an instructive manner

Ok the external fault loop impedance. The earth conductor, the transformer and the incoming line conductor.

Thinking about it if polarity is not correct you would not have a voltage when you touch the probe on the incoming line, so you could not do the test. This is not the recommended live polarity test though

Ok I am sorry for saying he needs locking up then, I am new to testing, I tested for polarity using the method I outlined. I will see if my tester indicates polarity tomorrow, I had not noticed that before. I thought they were trolling me

Put your multifunction tester onto volts, and hold the probes on the incoming terminals of the main switch on the consumer unit. Look to see if L and N are indicated as correct on the display  Thank you for the heads up :)