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

Discuss Is 0.75mm Flex in conduit behind tiles and tile backer sufficient for led lights (6w) or Fan (4w)? in the UK Electrical Forum area at ElectriciansForums.net

benhurr

DIY
Joined
Sep 16, 2022
Messages
69
Reaction score
10
Location
harrow
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.
 
1 out of 3 quoting electricians said that those need to be replaced.

Did they say why? Quote a reg number?

0.75mm handles 6amp

Depends on what the data sheet says. It may be 6A when installed in free air. What about the derating factors for conduit?
Any ferrules used?
 
RCDs don't provide overcurrent protection, this will be provided by a fuse or MCB. Unless it is an RCBO where it is provided by the overcurrent portion of the RCBO.
yes fuse is possible , fused spur maybe. Light and fan is on different circuits. Fused spur for fan definitely (not for light)
 
Last edited:
How much of this project has been installed?
at this moment only spare cable for fan and one short cable for mirror light are installed because those are under tiles .this cable will only serve 1 light , the rest of the circuit is on TE cable. this room 4 led lights in total. Together with the rest of the light circuit it will be about 12 lights (including). Fan is on outlet circuit.
 
It would not be compliant with the wiring regulations, the minimum size conductor for lighting circuits is 1mm^2

If there is a fused connection unit, or plug with a suitable fuse for the flex then it would comply.

The principle is that fixed wiring is protected by the mcbs or rcbos or fuses in the consumer unit and must provide disconnection times generally of 0.4s in the case of a fault.

Flex doesn't have to do this as it's usually associated with an appliance or so on, so it must have it's local fuses, and shouldn't really be used as fixed wiring, although there isn't a specific regulation preventing it.
 
It would not be compliant with the wiring regulations, the minimum size conductor for lighting circuits is 1mm^2

If there is a fused connection unit, or plug with a suitable fuse for the flex then it would comply.

The principle is that fixed wiring is protected by the mcbs or rcbos or fuses in the consumer unit and must provide disconnection times generally of 0.4s in the case of a fault.

Flex doesn't have to do this as it's usually associated with an appliance or so on, so it must have it's local fuses, and shouldn't really be used as fixed wiring, although there isn't a specific regulation preventing it.
So to recap adding fused unit like a maintenance switch will not make it compliant? Even Just for short 1m leg of wiring?
 

Reply to Is 0.75mm Flex in conduit behind tiles and tile backer sufficient for led lights (6w) or Fan (4w)? in the UK Electrical Forum area at ElectriciansForums.net

News and Offers from Sponsors

  • Article
Join us at electronica 2024 in Munich! Since 1964, electronica has been the premier event for technology enthusiasts and industry professionals...
    • Like
Replies
0
Views
706
  • Sticky
  • Article
Good to know thanks, one can never have enough places to source parts from!
Replies
4
Views
1K
  • Article
OFFICIAL SPONSORS These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then...
Replies
0
Views
3K

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top