Topic starter
So the outdoor floodlight above the kitchen/garage area has failed after many years service. I've picked up a new light to take over and on reading the instructions it suggests round cable minimum of 6mm diameter. The existing cable comes from inside the garage operated by a standard light switch runs about 4 metres externally to the position of the light.
Should I replace this with armoured cable? The existing cable is flat and has been in place since long before I moved in 15 years ago. It doesnt show any signs of external perishing but granted that might not tell the whole story internally.
I've had a quick look on Screwfix for costs and they don't do a 10mtr roll, so cheapest is £73 for 25mtr. The light was £20.
Posted : 30/04/2020 12:45 pm
Sure it's not 6mm total cable diameter? (1.5mmT+E should satisfy this) to ensure a good seal on the gland/entrance to the unit. 6mm² armoured sounds like overkill for a floodlight. I'd probably route cable in conduit if replacing, especially if no RCDs. IANAE.
Posted : 30/04/2020 1:10 pm
No need for armoured unless it is somewhere likely to get damaged, and if it been there 15 years its probably not in a location like that. Hi tuff is good or arctic cable (although that tends to be blue or yellow). TLC will have a few options https://www.tlc-direct.co.uk/Main_Index/Cable_Index/index.html They sell by the metre (including armoured if you do want that). I'd use this: https://www.tlc-direct.co.uk/Products/NY1dot5slash3.html
Posted : 30/04/2020 1:18 pm
I imagine it says 6mm diameter cable to ensure the cable clamp or gland is tight.
Would be inclined to just do a straight swap, especially if it's worked for years and is an LED.
Posted : 30/04/2020 1:22 pm
It's hinting at using a circular cable for the gland entry for a better seal!
You won't need anything bigger than 1.5mm core CSA for this
If it was me, I'd be tempted to join the T&E and the new circular cable in an external IP rated junction box, then up to the light fitting from their.
This means you're not trying to connect the light fitting up whilst up ladders or steps.
You can do it at ground level, then once the light is on the wall it's a simple termination in the junction box.
Posted : 30/04/2020 2:05 pm
Topic starter
Thank you all very much.
As pointed out 6mm is the total diameter and the instruction is for a better seal on the gland into the light.
Thanks, another lockdown job gonna get ticked off the list!
Posted : 30/04/2020 2:46 pm