So as you've all run out of reasons why I'm wrong and refuse to directly answer the points I have raised, except for something in the 17th edition.
Can one of you explain how these contactors work? and why they are a safe form of isolation?
Well, go on then tell me all about them. I won't be holding my breath.
Maybe we've all misunderstood.
Are you actually saying that you
don't know what a contactor is, that you
don't know how they work?
I have previously explained that the BS for these contactors does'nt exist, but that inconvenient point seems to escape you.
No - what you said was
I checked bs 60947-4-1 on the bs website, there is a section headed "contactors for use as isolators" or words to that effect, and it says "under consideration"
You have not provided any more information about the context of that term - as I observed how are we to know that it's not from a document which said that it's the
use of contactors to 60947-4-1 for isolation that is under consideration, not the actual standard itself? You've not said what the date of that document is, or when it was last updated. Maybe when it was written the
use of contactors
was under consideration - by the committee responsible for BS 7671, and maybe whoever wrote that document has not updated it to take account of the fact that the use is no longer just "under consideration".
Or how do we know that it's not a document referring to a new version of, or an amendment to BS EN 60947-4-1?
We'll never know unless you clarify.
But one thing we
do know, is that as the BSI themselves will happily take my money in return for a hard copy of
BS EN 60947-4-1:1992 or
BS EN 60947-4-1:2001, your claim that "the BS for these contactors does'nt exist", is, to coin a phrase, b*******.
And what's particularly appalling about that is that as you are a subscriber to the BS site you
must have known that, since even the most cursory search turns up the fact that there
was a BS EN 60947-4-1:1992 and there
is a BS EN 60947-4-1:2001, but you decided you'd try and lie to us in order to shore up your crumbling position.
So as BAS has decided to restart this post,
No - I think you'll find you restarted it when without any justification you asserted that at least 7 people contributing to this thread knew nothing about contactors and still don't.
What are these contactors called?
They are called contactors. Maybe some makers call them "isolating contactors" - I don't know. I expect some of them have really boring names like "Contactor 3 poles 15KW 400VAC AC3".
I imagine they are widely available from companies that supply switchgear and controls etc. I expect that the major manufacturers of distribution board components and industrial automation products feature them in their product ranges and that they would be available from the same wholesalers and agents as their MCBs, RCDs, RCBOs, switches, timers, PLCs, busbars, enclosures and so on.
Where do you normally buy things like that? Have you asked there if they sell contactors?
It seems that I can.
