Grid switches

[b21playa]

The tabs would ideally rest flat onto the wall, if theres not enough wall , then what i do, usually with surface boxes, but would work with flush boxes, is slip some thin 4mm washers over the screws then you can get the grid yoke tight and not flapping about, it may take a few goes fitting the cover on and off till you get the spacing right

Thanks for the advice.

what depth backboxes are recommended?

 

[333rocky333]

Not sure but would quess 25 mm minimum, with Crabtree a good few mm protrudes forward inside the metal grid and cover, on a new install 35mm if possible is a safe bet

 

[b21playa]

The tabs would ideally rest flat onto the wall, if theres not enough wall , then what i do, usually with surface boxes, but would work with flush boxes, is slip some thin 4mm washers over the screws then you can get the grid yoke tight and not flapping about, it may take a few goes fitting the cover on and off till you get the spacing right

Thanks for that, I bent the tabs back flat which allowed the yoke to sit flat with the wall and cover to go on no problem. I just need to swap 25mm backbox for 35mm to allow more space for cables to fit behind

 

[333rocky333]

b21playa, If i may ask, how come you call it a Yoke, not heard anyone say that for years, it was quite common for older electricians to use back in the 1970's

 

[RF Lighting]

I started as an apprentice in the late 90s and have always known it as a yoke

 

[securespark]

In the early eighties, I knew them as yokes.

 

[b21playa]

b21playa, If i may ask, how come you call it a Yoke, not heard anyone say that for years, it was quite common for older electricians to use back in the 1970's

How it was labelled at Toolstation and in the Crabtree catalogue

 

[securespark]

A traditional "yoke" joins animals together.
I guess this "yoke" joins switches together?

 

[JohnD]

often, but not always

milkmaid's yoke

a single animal can also be yoked to a plough

A yoke seems to be roughly Y-shaped

 

[securespark]

Blimey, that's a bit pedantic.

A yoke joins things together.
That was the gist of it.