Cabbles And Currents

[hopeh David]

Hello....I want to know how to calculate current that passes through

1.5mm2

2.5mm2

4mm2

6mm2

10mm2

16mm2

Etc thank you

 

[Andy™]

I=V/R

 

[ProDave]

Look at the manufacturers spec for maximum current carrying capacity.

 

[Evans Electric]

Sorted.

 

[NozSpark]

For flat insulated & sheathed cable it's all in table 4D5a

 

[hopeh David]

My question has not been answered yet ....about cable and current

 

[ProDave]

My question has not been answered yet ....about cable and current

Yes it has

 

[Andy™]

see post 2, 3 &5...

 

[hopeh David]

Its didn't get it....I mean I want the formula please.

 

[Andy™]

Its didn't get it....I mean I want the formula please.

post #2... I=V/R

ill expand that for you

current = voltage / resistance

any better?

 

[kerching]

Do,you mean

How much current a cable can carry?

Or

Do,you mean how much current goes down a cable for a given load?

Two VERY different things

4mm is rated under certain circumstances and conditions at 30 odd Amps

It is easy to get that down to 16A by letting it go through insulation.....have a look in the book

Just saying

 

[hopeh David]

I mean how much current an cable can carry....

 

[ProDave]

See previous answers.

 

[Rob_the_rich]

Hello....I want to know how to calculate current that passes through

1.5mm2

2.5mm2

4mm2

6mm2

10mm2

16mm2

Etc thank you

To find the resistance you would need to know the length, say 1 metre, then use the resistivity of copper http://www.engineeringtoolbox.com/resistance-resisitivity-d_1382.html to work out what the Resistance is for that length, then use the formula in post 2 to work out the current

 

[hopeh David]

Yes I know current is v\r

So does it me that a 1.5mm2 cable will equal

230/1.5

 

[ProDave]

Yes I know current is v\r

So does it me that a 1.5mm2 cable will equal

230/1.5

NO

 

[apprentice87]

Hi Hopeh,

The only way to know how much current a cable will carry, is to ask the makers of it. You must remember though, that this is a nominal figure, it all depends on the temperature, and how the cable is installed. What i mean is, if you put the cable in a duct in a hot place like Ghana, it would not be able to carry as much current as it would out in the fresh air here in cold britain. [it is to do with the heat the cable can safely be allowed to reach]

I "THINK" you would be better off finding out about the effects of "volt drop" You see, you might think a cable will carry, say 30 amps, but if the cable is 300 metres long, you might find that where you started off with 230V, you now have only a fraction of this left. This means that to carry your 30 amps 300 metres and still have 230 volts you might need a very much larger cable. Do you understand what i mean??

john..

Here are some charts you might find interesting..

http://onlinelibrary.wiley.com/doi/10.1002/9780470998373.app4/pdf

john...

 

[Rulland]

Well having just joined the forum, and read just this one thread, one can say that tbph it's no better than the IET forum, the regulars just belittle 'joe bloggs' after answers, blinding them with P=VxC, and I=V/R, etc, anyway, hello and welcome from North Wales people.

 

[Lurch]

So what is the answer then?

 

[Rulland]

Hi Lurch, and thank you for the reply, Er, maybe treat people with a little respect, you know, the people that post here are after a bit of help I would imagine, Soooo, either give it or give up.

Yes we have the skill (I'm NICEIC), but heh, I'm still actually a nice guy that doesn't look down his nose, I was there once!.