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If the DNO fit an isolator in the meter box of a house it is obviously intended for use by ordinary persons so it MUST break all live conductors, Makes no difference if the main switch in the customers CU does as well, If the DNO fit a switch, and it is intended for use by ordinary persons, then the reg applies..
No, it is not intended for use by ordinary persons, the main switch in the CU is intended for use by ordinary persons. The main switch in the CU covers the regulation you posted above. Anything else can be single pole and not contravene any regulations.

 
The switch is installed in a box OWNED by the householder, and is therefore "provided for his use". What if the householder himself wants to change or add to his CU, which he is perfectly entitled to do?? You cannot say that this isolator is only to be used by electricians or the DNO, Is this were the case it would be sealed.

The regulations state the the isolator is to be provided as close to the origin of the supply as possible, [not if preventable, up to [normally] 3 metres away at the CU] so could it not be argued that the isolator in the box is required by 7671 and therefore must comply with the DP bit....??

john..

 
You work to BS7671 they don’t. They determine the equipment boundary which is why they can seal the incoming side of the isolator.

I’ve got involved with a bit of an argument over equipment boundaries. WP have moved it and didn’t tell the customer. It’s looking like the customer’s now the proud owner of two oil switches he didn’t know about.

 
The switch is installed in a box OWNED by the householder, and is therefore "provided for his use".
How so? The cutout is in the same box.

What if the householder himself wants to change or add to his CU, which he is perfectly entitled to do??
And what if he does? Nothing is stopping him from doing so.

You cannot say that this isolator is only to be used by electricians or the DNO,
I didn't, I said it is not for use as isolation as it is SP so therefore the CU MS is the main isolator (as is standard in millions of properties).

Is this were the case it would be sealed.
They sometimes are.

The regulations state the the isolator is to be provided as close to the origin of the supply as possible, [not if preventable, up to [normally] 3 metres away at the CU] so could it not be argued that the isolator in the box is required by 7671 and therefore must comply with the DP bit....??
No, otherwise you would have to argue that every CU without an isolator within 100mm of the meter is also a fail.

 
For what it is worth I belive the reg quoted earlier is covered by the main switch in a CU.

 
Does anyone know the BS EN for a Wylex Rec2s which is typically fitted by DNO's?

This is a relevant question to the thread, I honestly can't remember, I think, I know what it is, but, I am not sure, and, my pc that has my tech stuff on it is "busy" at the moment, don't ask about that!

 
I believe it is Andy, but, as I say, the definitive answer would be in the Wylex tech data, which, I can't access right now.

Bar online on the iPad which is a pain.

If we take it that it is to EN 60439-3, this is an obsolete standard, which has been superseded by EN61439-3.

So, if the REC2s is still for sale, which it is, then it is required by law (product laws) now to comply with the updated standard.

It is reasonable to take it that it therefore does comply with the new standard, yes?

 
Does anyone know the BS EN for a Wylex Rec2s which is typically fitted by DNO's?

This is a relevant question to the thread, I honestly can't remember, I think, I know what it is, but, I am not sure, and, my pc that has my tech stuff on it is "busy" at the moment, don't ask about that!
The catalogue doesn't specifically state what standard the REC2s complies to, however the switch in a REC2s is a standard WS102 AFAIAA which the catalogue states is BS EN 60947-3.

 
Thank you Lurch, as I said, I don't have access at the moment, well, online iPad access is a joke really.

So it's 60947-3.

Now, if the DNO fit these, they have to fit them into a suitable enclosure.

Forget my earlier post, I need to get some info off the computer, this is crazy trying to do this on the iPad, I am going to get it wrong, if I haven't already, in trying to cross refence information between apps.

Please excuse me for an hour or so whilst I finish sorting out the data backup on my laptop.

 
That is what i thought, but it turns out that there are single pole ones or at least you can put a single pole switch in them.. God only knows what the DNO do!!

Have a look at this picture..

http://i.ebayimg.com/images/i/291506625407-0-1/s-l1000.jpg

The centre and right ones are clearly double pole, but what about the one on the left.... Have a look at the little symbols on the front..

john..

 
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WS102 are DP isolators. no idea why one of them only appears to show 1 pole being switched though. ive got a few of them at my unit, ill have a look tomorrow and see what markings are on them

 
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