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Yes. I said that in post 78. But draw the diagram in scale and it would look better.

Yes, but with the bond it is joined to the CPC with the voltage on it. Looking at the top diagram Instead of touching point B: what if the person was touching another point on the live CPC. Do you think that would be any different?

I did - and I also drew the MET just five inches away - but as Trojanhawrs said: Yes and if moved far enough from the tap it would be just connected to the MET and doing no good at all. But it is completely different; this is what you are missing. Without the supplementary bond the pipe is...

They detect tiny currents flowing to earth - including through a person. Although the MCB will likely be adequate in the situation we have been talking about. .Because the R in the equation R≤50V/Ia can be 1666Ω because Ia is 0.03A. If it were to be higher than that which is highly unlikely...

Do you have in mind 415.2.2 which you are trying to satisfy? John has previously shown the requirements in this regulation to be wrong?

But without SB, point A is live and point B is connected to earth.

Now you will have confused the OP.

Yes, but I was asking Equitum for him to say; not because I didn't know.

Yes but you are ignoring the pipe and its associated CPC. If you assume they are negligible as well then the person is just touching two points close together on the same conductor - like the birds.

Couldn't find any suitable diagram so - is this any help? What will be the voltage between points A and B with and without the supplementary bonding.

Blue in the left connector; Red in the right.

I'll see if I can find a diagram.

But that is what you are asking about and why/how they are negated by supplementary bonding. Because the only way to negate/reduce touch voltage is to join the parts by supplementary bonding. During a fault with a high current flowing in, say, one CPC, does not mean that all earthed and bonded...

I agree it is NOT an exposed-c-p but Harry thinks you must consider it becoming live by being touched by a live wire which is what makes parts exposed-c-ps.

Then you are still and will be wrong.

There is a lot of confusing and irrelevant information in the replies in this thread. I would advise the OP to search for "touch voltage" to answer the actual original question.

Yes. That is not a consideration regarding bonding. If you think that is likely to happen then the pipe would be considered an exposed-c-p and should be earthed rather than bonded.

Do you have gas? If so where is the gas pipe entry and bond? Would it be easier to run a bonding cable from the water entry point to the gas bonding cable and connect them together?

The stop tap is irrelevant. If required the bonding conductor must be connected "as near as practicable to the point of entry" to the premises of the pipe (although this is likely to be where the tap is). . No - before the stop tap so that you cannot touch any of the pipe which goes outside or...