Equipotential bonding required for new boiler?

[JohnW2]

Actually, I did. All are connected together, and to the earth terminal at the CU.

OK, I must have missed it, since I never noticed a reply to my:

Is each radiator also connected by G/Y cables) to all exposed-c-ps and other extraneous-c-ps in the location? If not, then it is presumably 'earthing', not supplementary bonding..

Your large lumps of metal, not earthed/bonded, are fine, providing you can absolutely guarantee that they are isolated, from absolutely any chance of becoming live - for everything else....

"Absolute guarantees" very rarely exist in the real world (the fact that we will all die one day being one of the few certainties ), but one can get quite close to that situation - in which case (in my opinion) the increased risk of electric shock resulting from the presence of significant amounts of "unnecxessarily earthed metal" trumps the alternative.

 

[JohnW2]

Yes Agreed and that is what I was attempting to point out, if it`s in the realm of 55/50 yes or no you make a choice (I`d usually do the same as you suggest) but if you have particular info of one way or another becoming more likely (including in the future) then you might, just might decide the opposite.

Sure - but, as I said, in relation to a pair of 'risks', both of which have incredibly low probabilities, one ius rarely going to have such "info2.

It would only be after a lifetime and with all results permanently monitored that you would know that you selected the correct choice.

Eaxctly.

You make your best guess and decide yes or no. If some quirk drives you harder one way or the other then you might, just might decide to modify that choice.

Again, indeed - but, in most of the situations we're talking about, one might as well just 'toss a coi', rathwer than engaging in endless discussion and debate about a question to which no-one can really know the 'correct' answer in any given situation!

Why did "Home Office" Skirts appear on batten lampholders for bathrooms? Was it to decrease the danger by someone standing hot, naked, sweaty in a bath full of water and reaching over arms outstretched to change a lightbulb whilst it`s switched on? They`d be stark raving mad but some folk would do it!

You tell me

 

[Harry Bloomfield]

in which case (in my opinion) the increased risk of electric shock resulting from the presence of significant amounts of "unnecxessarily earthed metal" trumps the alternative.

Then we will have to agree, to disagree.

 

[JohnW2]

Then we will have to agree, to disagree.

We will, which is fair enough.

As you will be aware, I have a similar concern about the metal CUs that have been forced upon us. They are necessarily earthed but I feel sure that (if it has not already happened) it's only a matter of time before there is a death as a result of someone touching that 'earthed metal') (which, IMO, would be far better as plastic) whilst 'playing around' with things within a CU - unless the paint managed to save their life!.

 

[flameport]

Why did "Home Office" Skirts appear on batten lampholders for bathrooms?

They didn't - or at least they were not required.
Only mentioned for lampholders in the 11th, 12th and 13th editions (1939 to 1962), and then only for temporary installations.

 

[SUNRAY]

As I understood it the origin of the 'Home Office' skirt started as a spec from THE Home Office for bulb holders to replace the oil lamps on newels and designed to retain the existing listed decorative glass chimneys. They were brass, screwed onto the brass bulholder, 3-4" diameter with slots in the curved vertical part which I assume was for heat?

Whether that 'history' is a load of old bull tish I really don't know, however there is an extremely slim chance I may still have one lurking in a box of old toot.

 

[Harry Bloomfield]

Whether that 'history' is a load of old bull tish I really don't know, however there is an extremely slim chance I may still have one lurking in a box of old toot.

I don't understand your version, but my understanding is. First, it helps deflect moisture from the live electrical parts of the lamp holder, and secondly, it makes it difficult to contact the unearthed metal base of the BC lamp. The reason for which, being that if the lamp suffers an internal short, between one of the two live contacts, and the metal base, the risk is of someone changing a failed lamp, with it still on.