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#141872 - 11/06/04 07:57 AM cable size
james S Offline
Member
Registered: 05/13/03
Posts: 107
Loc: West England
does anyone have problems determining the size of cables between 4mm2 and 6mm2?
this can be a seriouse mistake if misjudged.

Also does anyone use a micrometre to calculate the size of cable using 3.14 * radius squared?

i have tried this method and cant seem to determine the true sizes both on stranded and solid.
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#141873 - 11/06/04 01:07 PM Re: cable size
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
James,
Quote:
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.
Quote:
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!.
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#141874 - 11/06/04 01:48 PM Re: cable size
pauluk Offline
Member
Registered: 08/11/01
Posts: 7520
Loc: Norfolk, England
I must admit that at a quick glance it's much harder to distinguish between 4 and 6mm than between, say, 1.5 and 2.5mm.

Actually, it wouldn't be a bad idea if the cables were marked somewhat more clearly as to conductor size.
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#141875 - 11/06/04 04:11 PM Re: cable size
uksparky Offline
Member
Registered: 07/06/04
Posts: 200
Loc: UK
"...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.
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#141876 - 11/07/04 07:36 AM Re: cable size
james S Offline
Member
Registered: 05/13/03
Posts: 107
Loc: West England
If you find it hard to tell the difference between two different sized cables, your not worthy of the title 'electrician'?
now things are getting a bit silly.

i have known many people to misjudge cable sizes, this was only a question trumphy i did not ask to be insulted.

thanks for your reply/honesty pauluk,uksparky
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#141877 - 11/08/04 02:28 AM Re: cable size
C-H Offline
Member
Registered: 09/17/02
Posts: 1497
Loc: Stockholm, Sweden
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)
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#141878 - 11/08/04 04:22 PM Re: cable size
uksparky Offline
Member
Registered: 07/06/04
Posts: 200
Loc: UK
'S ok James

Without questions we gain nothing...
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#141879 - 11/08/04 06:12 PM Re: cable size
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
Whoa!,
Sorry guys.
Quote:
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.
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#141880 - 11/09/04 07:41 AM Re: cable size
james S Offline
Member
Registered: 05/13/03
Posts: 107
Loc: West England
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).]
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#141881 - 11/09/04 12:10 PM Re: cable size
uksparky Offline
Member
Registered: 07/06/04
Posts: 200
Loc: UK
Quote:
Also they have a metre-marking on them, to identify, the amount remaining on your reel.


Now that I could really get used to!!

What a sensible plan.
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