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PAGE 16 of the OSG says min 6mm for main bonding but this would only be suitable if you main earth conductor was 10mm or less...I agree if 16mm main earth conductor then main bonding has to be 10mm...but if the customer aint paying then I aint changing it!

Hi Yes you'll need a triple pole isolator if the fan has an overrun timer. the wiring arrangement will depend on your existing, but basically the fan and light will require the same switched live and the fan will also need a permanent live. the s/live, live and neutral to the fan will...

Do these have to be accessible?

ELECSA may be recognised worldwide(although I doubt it) but this does'nt mean being registered with them allows you to work worldwide( I'm pretty sure of this). Elecsa allows you to register normally notifiable work in the UK through them. I would imagine that Spain and any other country for...

Now that is something to be proud of!!!!!!

whatevers easier.....I know what you mean about bad practice, just does n't quite seem right..If switches were meant to have neutrals in them then why not make em that way?

Is this why we put the earth on the back box????

Thanks Carter 240v and DNO's fuse it is

I know about the tables, Just trying to establish if the existing earthing is ok. If not then I'll change them as per table 54.7 Cheers

Thanks PaulM...So for the MEC am I using the graphs for the dno's fuse or the main switch in CU? Cheers

Hi All, My first post on this site so here goes.... Can anybody help....Trying to establish if I would have to change the mec on a TNS system.... Ok So S=sqr(I2xt)/k When establishing the value of 't' do I use the characteristics of the distibutors main fuse or the main switch in the CU or I...