What size conduit for 3 T&E for a light switch

[phatboy]

Why 1.5mm, 1mm would likely be adequate and easier.

I'll assume you mean oval plastic conduit, as that's what I always use and find, in which case 3 x 1.5mm would go, but it may be rather tight.

Best / worst I've experienced was 4x 1mm t+e in a 20mm oval conduit. Sadly the installer had used crampets and squashed it, so nothing would move when I needed to change one.

I always fit 1 if there are more than 2 cables, makes things easier if a change is needed down the line....

 

[ban-all-sheds]

@Stu777123 what exactly do you mean by “conduit” and why do you think you need it?

And why three cables? How many gangs in the switch?

 

[ban-all-sheds]

my experiences of trying to 'change things' when one has T+E in (particularly plastic) conduit are not very happy ones, even when there is just one T+E in the conduit, and far worse when there is more than one cable.

It a straight length probably about a meter

 

[JohnW2]

I've sometimes found it far from easy even with short lengths of straight conduit when there have been multiple T+E cables in it. In any event, I wasn't talking about the OP's 'straight 1 metre' but, rather, was responding to the far more general comment (my emphasis) ...

... When it comes to concealed wiring, conduit is a godsend for changing things, especially when correcting DIY work, so I always promote conduit!!

 

[ban-all-sheds]

My wagoboxes are currently beyond reach - I wonder if they have conduit knockouts.

Just thinking about stranded singles in the conduit, connected to T/E in a MF box at the top....

 

[ban-all-sheds]

Ok then, MAY.

When it comes to concealed wiring, conduit is a godsend for changing things, especially when correcting DIY work, so I always promote conduit!!

I've been advising that since before you joined

And specify that all buried cables are to be installed in conduit, not capping, or simply plastered over. This will make any future changes a great deal easier.