Single core cable in conduit terminating outside

[Gaz9428]

Looking for some advice;

I am intending to mount two led downlights on pillars/brick walls either side of the garage door opening. I will drill through the cavity to feed the cable through. There will be a PIR sensor mounted in the middle above the garage door.

Internally i wanted to put the cables in white 20mm PVC round conduit to keep it neat and afford it some protection. There would be some bends and boxes.

I was going to use single core 1.5mm2 cables for the wiring, my only objection/thought was when the cabling would leave the conduit to go through the cavity there would be 3 single insulated cables, this will potentially be problematic when the cables go through the grommet into the light fitting as it would usually be a single cable with 2 cores plus cpc.

I can only see my options as follows;

1 - Use single core wires and sheath them when they leave the conduit in some heat shrink to make 'one' cable.

2 - Use double insulated 3 core cable in the conduit (Worried that on some sections 2 cables will be in the 20mm conduit and it will be too tight)

3 - Run the last section where the cables go through the cavity in double insulated 3 core cable and joint at entry into the conduit and run in single cores internally.

4 - Run double insulated cable externally and internally and do away with the conduit

5 - Run the single core cables straight into the light fitting and ensure around the fitting is correctly sealed.

If anyone has any other ideas or solutions please feel free to comment.

 

[Lucien Nunes]

Conduit cables must never exit the containment to run through the cavity or enter the fitting. While sleeving them will offer some protection, it will not create a cable of known, approved specification. I would terminate them at the adjacent box and run UV-resistant round sheathed cable e.g. H07 to the fitting, as is the normal method.

 

[Simon47]

And don't forget that cables should not pass through the cavity without protection.
One option would be to run conduit from the back of a box, through the wall, and into the back of another box outside. Then connect (choc-block, Wagos, crimpts, whatever) in the outside box and a flexible (going through a gland for sealing and strain relief as it exits the box) cable to the luminaire.

 

[telectrix]

And don't forget that cables should not pass through the cavity without protection.
One option would be to run conduit from the back of a box, through the wall, and into the back of another box outside. Then connect (choc-block, Wagos, crimpts, whatever) in the outside box and a flexible (going through a gland for sealing and strain relief as it exits the box) cable to the luminaire.

agree. run 20mm conduit through wall. (22mm hole should be just right) box on both sides of wall..

 

[telectrix]

agree. run 20mm conduit through wall. (22mm hole should be just right) box on both sides of wall..

forgot to add,,, use appropriate couplers etc. and the proper glue that melts the conduit and gives you a high. be careful if using a ladder, a good high could be a bad fall.