IP65 garage light switch: Sealing the cable entry points

[mike004]

My garage roof now leaks a bit in heavy rain. So I have bought this type of IP65 external switch to replace the existing standard internal fused light switch in my garage.
https://www.screwfix.com/p/british-...y-weatherproof-outdoor-switch-with-neon/54649
Should have bought the 1-way version really, but it seems I can easily convert it.

A couple of questions:
- I will remove the circular punchouts at the top and bottom of the mounting box. How do I then seal the mounting box? This an obvious place for water ingress, and the holes look rather large.
- The switch does not seem to have a fuse. Is this a common design for external switches -- the mains unit trips instead?

 

[crystal ball]

20mm stuffing glands
https://www.screwfix.com/p/tower-male-comp-gland-20mm-2-pack/80851

 

[mike004]

Thanks, I can see how that would be a good seal.
I expected something like this to be supplied with the product...

 

[EFLImpudence]

Should have bought the 1-way version really,

It doesn't matter. The other way round would.

- I will remove the circular punchouts at the top and bottom of the mounting box.

Why? Just use the bottom ones.

- The switch does not seem to have a fuse. Is this a common design for external switches -- the mains unit trips instead?

You have bought one that does not have a fuse.

 

[JohnD]

Just use the bottom ones.

...because water may drip down the cable, and get into the box.

The electrician's "drip loop" prevents this.

 

[EFLImpudence]

https://www.screwfix.com/p/british-...itched-fused-spur-flex-outlet-with-neon/27437

 

[securespark]

Why does it matter?

Why are you always nit-picking?

I would hazard a guess that EFLI picked a place most people live near and a brand that is half the price of MK. It happens to have a neon, so what?

 

[EFLImpudence]

I just picked the first equivalent of the OP's on the same site - with a fuse.

 

[mike004]

Just bought a pair of M20 grommets from Wickes.
The cable seals are missing!
Would a few winds of insulation tape suffice to give a decent seal?

EDIT: Found it. It was black rubber ring lodged in the top nut. Nothing like the diagram in the instructions.

 

[mike004]

Re: Neon. All stock at Wickes had neon.
You can configure the neon operation:
- Neon always ON when power is ON (called Power mode)
- Neon only ON when switch is ON (called Switch mode)
- Neon only ON when switch is OFF (called Locator mode, presumably for finding the switch in the dark)