Discuss Rating of lighting cable (1mm & 1.5mm) in the UK Electrical Forum area at ElectriciansForums.net

M

martind

Ok, my first question(s)
What is the max current for 1mm & 1.5mm cable respectively? (I am trying to workout if there are two many lights on the same lighting circuit).
 
It's not as simple as "This csa cable can take this current"
Lot's of factors lower the ccc of a cable such as grouping, running in insulation, thermal effects etc.
 
Many installation factors need to be considered before an accurate decision is made.

What size protective device is protecting the 1.0mm t&e??
 
1.5mm is 20a, 1mm is 16a but only when clipped direct. There are, of course, as already mentioned, other factors to consider relating to the installation method. However, as lighting circuits are usually protected by a 6a protective device, there is USUALLY ample capacity to play with using either. For example, when 1mm is run in thermal insulation, the current carrying capacity is halved, but still exceeds the 6a breaking capacity of the protective device. Normally,you don't want to be exceeding 6a on a lighting circuit - you'd have to go out of your way to derate the cable below this.
 
You guys are really fast to respond! Thanks.
I am referring to flat twin & earth. I do not know what the term “clipped” means (but hopefully will do in a few mins.
After a brief inspection at the CU it has been observed that the lighting circuit cable has been put in to a 16 amp breaker. It was also discovered that there are 11 lights on the circuit (maybe it was tripping when in the 6amp breaker)
 
If I were you, and wanted piece of mind, give a local sparky a call and ask for his advice when actually looking at the CU/house electrics.

You'll get lots of opinions here but there's nothing like looking at the actual installation.
 

Reply to Rating of lighting cable (1mm & 1.5mm) in the UK Electrical Forum area at ElectriciansForums.net

Similar Threads

Hi all, Looking for someone to help with this dilemma. Image attached to try and explain it better. We have 3 separate lights currently...
Replies
3
Views
640
can anyone please advise on where the wires go? My electrician installed a new cable ready for when I bought a security light. The cable as shown...
Replies
3
Views
594
Hi, Heavy industrial spark here, never do house bashing hence the question. I currently have a light switch at the front door not doing anything...
Replies
1
Views
475
Hi folks, I have been out to quote for a soffit lighting job. I have done jobs like this many times but usually only installing lights in the top...
Replies
8
Views
572
I am trying to understand how a relay system works and have designed a circuit and a ladder diagram all as attached for an 8 PIN relay, a current...
Replies
14
Views
497

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
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock