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Eh? I stopped reading after the first paragraph: "The ground we stand on is a much better conductor of electricity than the copper wires in our domestic circuitry and electricity will always travel via the shortest and fastest route through any set of connected conductors."

Regardless of the model, I hope you appreciate that the shock current flowing through a person in contact with an (unbonded) ECP will depend on the impedance to earth. I wonder what the 'experiences' were that increased the size from 2.5mm (14th) to 10mm today - and perhaps I should install...

If you are just talking about the normal earth fault path, then I agree the ECP would not part of the earth path. However, in this case adding the MPB does not remove the effect of supplier earth (although obviously the MPB may provide a parallel TT earth). If you referring to the effects of...

What about? I can't see this thread is any more desperate than any others here. The impedance of the ECP to 'mother earth' needs to be considered also of course which may well be the dominant factor. It's the 'various reasons' I am trying to understand. It would appear over the years the...

Hi Spark123, Thanks for reply - as I said I do understand the need to bond to avoid potential differences, but the bit I am struggling with is the reason this cable is dimensioned for such high current. Taking the washing machine fault again, could you provide an example of what sort of...

With the washing machine example, the fault current will typically flow through several metres of the earth wire in 2.5mm TE cable, and only a proportion of this will flow through the PEB. This sort of fault wouldn't usually cause the service fuse to blow. So it don't think this example shows...

Thanks, though I'm still a bit confused. From the above, I can see one reason for the PEB is actually to provide an alternative path the earth if the neutral in a PME system fails in order to prevent earthed metal work being mains potential - though this would not be sufficient to cause the...

The wiki on this site (and everything else I've found) says something along the lines of: "The purpose of main protective bonding is to create an earthed equipotential zone" I'm fine with that, but why does the cable have to be so thick: my current house is undersized as it is "only" 6mm CSA...

Although I can rely on the lock on my front door....

The MCBs also make it much easier and safer to isolate individual circuits than pulling the fuse. Which is pretty handy when doing DIY electrical work.

Well after 5 years of Part P we should be starting to see some reduction in injury if the arguments for it's introduction hold value. If the figures are unchanged, it kind of destroys the argument. Of course, maybe NICEIC just decided to reuse the old data, rather than be accurate... Does...

Does anybody know how this compares to the situation prior to the part P regime? Or how many of these injuries were caused by fixed wiring, rather than overloaded sockets or frayed flex?

Reading up on some of the wiring regs, I'm concerned about some aspects of my bathroom wiring (done by contractors in 2001 for the previous owner). There is no supplementary bonding. The only electrics in the room are SELV downlighters (non-IPXX rated) in the ceiling (2.2 metres above the...

I have an old wooden casement window: there is an opening section 1200h x 500w (mm) and alongside a fixed window 950h x 500w (and a small opening section above the fixed part). The fixed part is cracked. The window is on the 4th floor, so access is only available from the inside - is there...

I am planning a loft conversion in my 1930's semi. Currently there is an unenclosed staircase (i.e. with balustades) to the first floor. I want to put a second, unenclosed staircase directly over this leading to the loft. The loft will have an ensuite shower room and the option to divide into...