Grid switches

b21playa · 14 Nov 2020

333rocky333 said:
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 · 14 Nov 2020

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 · 16 Nov 2020

333rocky333 said:
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 · 16 Nov 2020

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 · 16 Nov 2020

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

securespark · 17 Nov 2020

In the early eighties, I knew them as yokes.

b21playa · 17 Nov 2020

333rocky333 said:
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 · 17 Nov 2020

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

JohnD · 17 Nov 2020

often, but not always

milkmaid's yoke

milkmaid-carrying-two-milk-jugs-with-the-help-of-a-yoke-in-1910-milchmdchen-KHNHKE.jpg

a single animal can also be yoked to a plough

A-Single-Rare-19th-Century-Ox-Yoke_100972280_86160_6B6CD705611A209E.jpg

A yoke seems to be roughly Y-shaped

securespark · 17 Nov 2020

Blimey, that's a bit pedantic.

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

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Grid switches

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