does anyone have problems determining the size of cables between 4mm2 and 6mm2?
Not as a rule, any Electrician worthy of the name would know that a 4mm2 wire comprises 7 wires each being 0.85mm in diameter. A 6mm2 wire comprises 7 wires having a diameter of 1.04mm.
Also does anyone use a micrometre to calculate the size of cable using 3.14 * radius squared?
Personally I've used a micrometer, to gauge Commutators and to gauge the gap on a set of HV reclosers, but if a guy bought a set of them out to measure wire sizes on a job site?. It's good, quality Control!.
"...any Electrician worthy of the name would know..." Aw...steady on!
Unless you are opening an accessory or looking at the conductors you can't see how many strands there are...
Personally I haven't been caught out yet, but I can quite see how someone trying to ID whether an isolated sample in a bundle is 4 mil or 6 mil might struggle; particularly as different manufacturers use differing thicknesses of outer sheath. I go with Paul here - a better indication on the sheath would not go amiss.
As for a quick ID - not always that easy.
If hindsight were foresight, we'd all be millionaires!
Re: cable size#141876 11/07/0411:36 AM11/07/0411:36 AM
Suggestion: The manufacturers could print/stamp the size as a 6 with a trailing square on the individual cores with regular intervals. (American cables would have a #10 )
The distance between the markings should be relatively short and on both sides of the core. (I know a circle only has one side, but you know what I mean )
Otherwise, the American concept of coulour coding the cable sheat is not bad. On European NYM, you could colour code the filler instead of the sheat. (White - 1.5 mm2, Yellow - 2.5 mm2, Orange - 4 mm2)
this was only a question trumphy i did not ask to be insulted.
James, I never intended to come across in such a condescending fashion, this was not my intention at all. I apologise for my comments. Oddly enough, our TPS cables are marked as to thier size and the number of cores and the types of cores (ie:2C+E or 3C). Also they have a metre-marking on them, to identify, the amount remaining on your reel. This comes in handy for stock control and charging out cable lengths used on jobs.
Re: cable size#141880 11/09/0411:41 AM11/09/0411:41 AM
during my apprentiship using a micrometre to size up cable was one of the things to be carried out as part of your portfolio.A while back now though. ive noticed some brands of ammoured cables also don't have the size/amount of cores.
colour code would not be a bad idea.
ps no apology needed,all's forgotten
[This message has been edited by james S (edited 11-09-2004).]