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Topic Title: MK Grid - what's wrong with this picture?
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Created On: 12 October 2017 07:35 PM
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 12 October 2017 07:35 PM
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TimJWatts

Posts: 421
Joined: 07 August 2013

Calling MK Grid experts...

Photo

Hi,

I've only used Schneider/GET grid before - but I need MK for my central heating as they do a non retractive 2 way centre off module[1]

I can't get it to go together in a surface box. You seem to have to stand it off on the screws (which are captive) and guess how high, so the plat screws on afterwards.

End result - fiddly, plate slips about on the movable lug and it's just "wrong".

Have I got the wrong frame or even the wrong box for this application?

The frame would totally work if it were trying to pull up against a wall in a flush application - but with a standard surface box, it just wants to sit down inside the box on the lugs and then of course the cover won't fit.

Sure it's something quite numpy...

Cheers,

Tim

[1] Fancy Internet heating control line into one way, live into the other, common off to boiler: Switch now represents "AUTO-OFF-MANUAL"

4 ways because 2 UFH zones plus one for the mixer pump. 100% manual switching even if all the fancy controller stuff fails... Simple, reliable
 12 October 2017 07:41 PM
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ashrow

Posts: 20
Joined: 14 May 2017

That is how i found MK yokes where when surface fitting (was a nightmare when doing the old pub refurbs with 24+ ways)
when boxes flush everything fine
 12 October 2017 07:54 PM
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TimJWatts

Posts: 421
Joined: 07 August 2013

Oh dear - so they are really like this???
 12 October 2017 08:28 PM
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JonSteward

Posts: 659
Joined: 04 December 2007

https://www.screwfix.com/p/mk-2-gang-metal-clad-box/32511
You'll need one of these.
 12 October 2017 09:00 PM
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alanblaby

Posts: 758
Joined: 09 March 2012

Wrong back box.
 12 October 2017 09:37 PM
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TimJWatts

Posts: 421
Joined: 07 August 2013

Thank you sir !

My fault. I just got what was on the TLC related products list.
 12 October 2017 09:38 PM
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TimJWatts

Posts: 421
Joined: 07 August 2013

Glad there's a reason... Thanks chaps...
 12 October 2017 11:30 PM
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mapj1

Posts: 9707
Joined: 22 July 2004

even so, if you have several to fit in a normal box and find the inner part is either too deep or too proud it is possible to make a bit of wood with notches that lays across the top of the box to allow you to set the inner yoke to the correct 'undone by 3to 5 turns' setting depending on the lug locations.

-------------------------
regards Mike
 13 October 2017 07:48 AM
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TimJWatts

Posts: 421
Joined: 07 August 2013

The difference becomes clear when you find the right page on TLC

TLC MK Boxesl
 14 October 2017 10:57 AM
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TimJWatts

Posts: 421
Joined: 07 August 2013

Well - the box works, but the plate doesn't!

I'm guessing you need the metal plate for a surface box and the plastic doesn't work because it can't go over the rim of the backbox.

MK have certainly made a pigs ear of this... However, they do have a 2 way centre off non retractive rocker, so have to use them for this...
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