Though for as long as i remember and even now, most commercial metal boards and isolaters, I recall have supplied a steel bolt through the metal case for the Earth, which is independent from the Earth bar which is again bolted to the steel box.
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Though for as long as i remember and even now, most commercial metal boards and isolaters, I recall have supplied a steel bolt through the metal case for the Earth, which is independent from the Earth bar which is again bolted to the steel box.
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Well I do and the guys I work with generally follow the same standard but then we work in the same genre. I've got lumbered on far too many ocassions with changing them during snagging to not do it that way.
Sadly we have no control over that one.OK - but, again, 'barrels' come to mindAs I said before, the great weakness in these 'different materials' arguments is the inevitable (but crucial) interface between the brass gland and the steel armour that one actually wants the CPCs to be connected to!
They always seem to be described as copper and AFAIA I've not found any which are not. They are available in stainless steel for use with specialist wires but never insulated.
Yep and [Royal]'we' don't use the steel bolt for the purpose.
I'm not quite sure what you mean, but ...
So often would I - but, assuming the box is not brass, that would presumably not satisfy SUNRAY's requirement for 'brass continuity' all the way from the gland body to the CPC, would it?
Kind Regards, John
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Exactly - which is why I don't see a lot of sense in worrying about one brass-steel interface when it is (electrically) in series with another over which, as you say, one has no control (i.e. cannot avoid).
Would you be happier if they made steel glands (maybe they do!)?
As I've said, maybe I'm wrong, it all seems like barrel-scraping to me!
Kind Regards, John
Pliers????
They make stainless ones..
They do, but I wonder whether he would be happy with those being in contact with non-stainless steel?
Anyway, even if he were happy, whilst that would eliminate the problem of the interface between steel armour and a brass gland body, it would not help him as regards the connection of that steel to a copper CPC, would it? Don't forget, that the alleged issue (without a banjo) was that the electrical connection from CPC to the body of the gland would then then via the steel box.
Kind Regards, John
Waterpump pliers, i quess
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It's another safety standard that ISTR is mentioned in 7671, I dont work to 7671 so do not know it in depth.
What I am saying is that 60204 (another standard) specifically (afaik) tells me that bonding should all be from one point, and as many of these safety standards all sing from the same hymn sheet
I can't see 7671 being any different so asked the question - why would the CPC be any different?
If the cpc or bonding can all be from a single point then there is no other materials between them so it makes a better connection albeit having the single nut to hold them down.
If you don't have multiple points to connect to then you have to do what you can with what you have.
You I'm sure would do what you can with what you have when you have no other choice - we have all been there at some point
Does it say what it means by 'one point'? For example, would multiple 'holes' (each with screws) in an 'earth block' (a very common 'MET' situation for bonding conductors, at least in domestic and commercial installations) count as 'one point' - or does that Standard require that one tries to stuff as many bonding conductors as one has into a single 'terminal'? (or does it perhaps only relate to 'bolted' connections?)
Kind Regards, John
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TBH I cannot remember, I have just had a quick look and cannot find it so I may even be thinking of another standard - may even have been UL (which is totally out of the IEC world of standards) and no way am I going to look through the 3000 page white book to find it lol.
Thing is, where does it say in 7671 that its not acceptable?
Thing is, where does it say in 7671 that its not acceptable?
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