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Great photo and obviously no confusion
when I wrote upside down I meant reading the writing standing on your head
 
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The isolator is simply a switch.

You will find the very same switch in a consumer unit with exactly the opposite wiring...

i.e. the tails go in the top and the busbar out the bottom.

So how is that any different if I install it with the tails going in the top, and the CU 'Feed' coming out the bottom. I never suggested installing it upside down, as I don't see the point.

I guess the main point in all this is that it is a switch, it simply breaks the circuit, does it really matter if it the upstream end happens to come from the top as opposed to the bottom?

Cheers
 
I guess not but familiarity of other sparks with the isolator (expecting to find it as my photo above) could mean they turn the switch off, take off the "user side cover" thinking it's dead and then get a zap because they're actually touching the live meter tails. Of course a decent electrician would have proved dead first but reading some of the very scary posts on this forum I wouldn't be so sure - that's where 537.2.2.3 comes in.
 
Unless the cover only can be mounted the other way up so the user side is at the bottom? Probably worth looking to see if that's possible.
 
Hi, here's a photo of one of my installations with a DNO installed isolator. Clearly the meter tails go in the bottom and feeds to the consumer unit come out of the top. If an electrician wishes to work on the consumer unit feeds, they can operate the isolation switch, take of the small top cover and remove the cables without interfering with the DNO side of the equipment. Looking closely, the switch is marked as being in the on position.

View attachment 7357
In the northwest British Gas fit the meter tails to the top of the isolator and the

feed to the meter at the bottom. 21/5/13
 
Looks to me the cover can go either way. So whatever side you put the meter tails into put the larger cover on this side. You may find the DNO will seal this side and the larger cover allows this. As for tails I tend to use brown and blue double insulated tails so no confusion.
 

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