Cutting opening in tiles

A diamond tile drill is a good start, followed by something diamond-ish to make the actual cut out. Diamond files are probably the easiest hand tool option but if you have dremels etc you might find that works with the right tool as well

My experience with all sorts of tiles suggest that nothing beats diamond tipped tools

If you have enough space behind to avoid the batons holding the plaster board perhaps the diamond coated jigsaw blades from ScrewFix might work...

.. they certainly work great on normal tiles.....

Never knew those existed. Looks like a winner. You can space the jigsaw away from the wall on blocks too

Or snap the blade shorter.

I sometimes despair of this group! The only answer is angle grinder!

Cheers

Dave R

Oscillating tool, and a diamond or carbide segment blade...

If it is a round hole, an oscillating saw w will not do it.

a back box is normally rectangular

Depends on the size of it - a circle is just a number of straight lines, with a slight turn at the end of each. If it is small enough, drill it, bigger, use a diamond core bit, larger multiple cuts with a saw.

Thanks all. I have a multi, and a jig saw, so I need some blades, and somewhere there's a tile drill bit. I did wonder if an angle grinder might be appropriate. Here's to making some dust.

AG with a diamond disk will do it, but make more mess. It might also be harder to do short cuts at the sides of the socket.

(the segmented disks on the multi tool, allow you to cut cleanly up to an proper stop position at depth, something you can't do with a 115mm disk in small space)

Presumably you will start by drilling a hole using either a standard TCT masonry bit or a glass/tile bit. Make sure the drill is in non-hammer mode & use masking tape to stop the bit skating.

Does depend a bit on what the tiles are made out of... If they are really hard porcelain ones, then just drilling a hole can be surprisingly difficult.

"The 90mm Carbide Blade quickly grinds out grout without damaging surrounding tiles. "

I think the OP wants to cut the tiles too.

Unless you are over in contintal europe :-)

They are drillable. I've drilled them before.

A diamond core drill makes all the difference.

If using a diamond core drill that does not have a pilot drill then making a plywood template with a matching hole will help prevent the drill wandering, just fix the template in the drilling position using gaffer tape usually does as once the drill bites the drill will continue without wandering.