Is 0.75mm Flex in conduit behind tiles and tile backer sufficient for led lights (6w) or Fan (4w)?

[benhurr]

Hello to all.
I know now that 1mm T&E would be better for lights, but legally is 0.75mm Flex in conduit behind tiles and tile backer sufficient for led lights (6w) or Extractor Fan (4w)?
1 out of 3 quoting electricians said that those need to be replaced. Is it really that bad? Looking at the specs it is more than sufficient (0.75mm handles 6amp 1380 Watt) and not being exposed to movement and covered by conduit etc.

 

[Julie.]

So to recap adding fused unit like a maintenance switch will not make it compliant? Even Just for short 1m leg of wiring?

Fused connection unit.

What is a maintenance switch?

 

[benhurr]

Fused connection unit.

What is a maintenance switch?

Fused spur switch ?

I think here is the answer suggestion that 0.75 on lighting is acceptable .75mm flex used from junction box to downlights - https://www.electriciansforums.net/threads/75mm-flex-used-from-junction-box-to-downlights.171264/
or maybe they are referring to an older regulations.
I can see now the reg It is clearly saying 1mm for lighting circuits 220v regardless of flexing.
But how about this way:
We remove the led driver from light fitting and place it in a box outside the room, this way it is going to be low voltage going via 0.75mm with is within current regulations.
The wire is less than a meter long.

To be honest it doesn't make much sense if this flex 0.75mm allowed on flexible applications like hanging lights but not good inside the wall in conduit behind tiles and backing board (even if it will be very short part of it)

 

[davesparks]

If it's in conduit the electrician can just use the bit of flex to pull through whatever cable they feel is required.

We can all give you our own opinions on what is/is not acceptable but ultimately it is down to the electrician who does the work and signs it off to make the decision and put their name to it.

A lot of electricians are likely to refuse to connect or sign off a cable which the customer has installed themselves regardless of what size or type it is.

 

[benhurr]

But how about this way:
We remove the led driver from light fitting and place it in a box outside the room, this way it is going to be low voltage going via 0.75mm with is within current regulations.

If it's in conduit the electrician can just use the bit of flex to pull through whatever cable they feel is required.

We can all give you our own opinions on what is/is not acceptable but ultimately it is down to the electrician who does the work and signs it off to make the decision and put their name to it.

A lot of electricians are likely to refuse to connect or sign off a cable which the customer has installed themselves regardless of what size or type it is.

 

[Pretty Mouth]

Interesting. The way I read table 52.3, from left to right, 0.75mm2 flex is permitted.

 

[littlespark]

There's a duplicate thread in DIY with the same subject, but neither has the full information.

 

[Julie.]

Interesting. The way I read table 52.3, from left to right, 0.75mm2 flex is permitted.

Do you mean the bottom section for single appliances and other applications?

It is my understanding that this really relates to the final aspects, such as pendant drops etc rather than fixed wiring

 

[Pretty Mouth]

Do you mean the bottom section for single appliances and other applications?

It is my understanding that this really relates to the final aspects, such as pendant drops etc rather than fixed wiring

I do indeed mean the bottom section, but I have selected 'flex' from column 1 first, then 'any other application' from col 2 (I assume this means 'any application other than those others listed for flex'), which gives me 0.75mm2 from col 3.

It seems logical to me to work from the table in this order, rather than working from the middle outward (though the table really could be clearer on this).

I had also assumed that the minimum 1mm2 was for non-flexible cables due to smaller conductors being prone to damage, either during installation or in use, whereas this wouldn't be a problem for flexible cables.