How to calculate the cross-section of a cable having a diameter?

Question

Hello, I have a question. I bought a cable and I want to know how many mm2 it has

The insulation has a circle of 7 mm (measured with a ruler)
Bez ma kolo hmmm a little less than 5

My question is how much is mm2?

qscgu · Accepted Answer

a colleague asked about mm2. if you believe its measurements, we have Pi * r ^ 2. which gives us about 18mm2.

elmer2 · Accepted Answer

Well, let's assume that the cross-section of the line in relation to the wire is reduced by 20% for air losses (let's call it that), then of these 16mm2 there will be about 12.8mm2 ...

wit007 · Accepted Answer

It looks like 10 mm sq. At 16, not too much

crazy_88 · Answer

I think it will be somewhere around 4.5 mm

wow · Answer

Well, even counting 4.6 mm without insulation, come with more

r is 1/2 the diameter of the cable so i heard

3.14 * 2.3 ^ 2 = 16.6106

hmm, I do not want to believe that this is 16-20 mm2, but if so, it's great

łowieca · Answer

Well, it's strange for me, because I have a 6mm ^ 2 cable for the sub, and the diameter is about 4 mm, just like my colleague WOW.
So it is written 6mm ^ 2, and from the calculations for the diameter of the circle about 13mm ^ 2 comes out

Can someone explain it, because it's some kind of strange math

wit007 · Answer

wow - there was no description of how you bought the cable? I understand it's included?
hunter - there is some "air" in the cable after all, so a simple pattern is not perfect. It would be different if it was just a single-ended cable.

SITO79 · Answer

and you do not get the wrong calculations by accident because you are counting the cross-section for the wire? after all, there is a weave of thin wires with tiny gaps between them. so a diameter of, for example, 5mm will give different mm? for a wire and different (smaller) ones for a line.

for the line, you would have to count each wire and feed it, so the same diameter gives actually smaller mm? for the line

łowieca · Answer

Well, in fact, I did not think about it - my mistake It should be obvious, but somehow it did not fall into my headache . Thanks for explanation

wow · Answer

I bought the cable separately on the Allegro at the auction for sale cable and cinch and I asked out of curiosity! Added after 1 [minutes]: So how much does my cable have?

wit007 · Answer

Maybe ask the seller? Seriously - a self-respecting producer gives a cross-section on the cable - every now and then there is an imprint with the name of the manufacturer and the cross-section. How could you buy a cable without knowing its cross section? A specific cable cross-section is necessary for a certain amplification power. Though there's one here who doesn't agree with it

wow · Answer

wit007 I asked if a cable with 7 mm in insulation will contact the hpb 602, they said that it is easy now, out of curiosity, I ask how much he has :D

Added after 9 [minutes]:

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How to calculate the cross-section of a cable having a diameter?

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