Earthed Cables vs. Unearthed Cables

Hello kmaharaja_86

I emailed you the information last week.

However, here it is, once more, just for you.

Earthed cables are earthed.

Unearthed Cables are not earthed.

Please save that very important data to your own computer, as in time you may forget, and then you can refer to your own repository of knowledge, in your computer, without having to ask the same question, once again.

Kind Regards....

Hello,

A cable is considered to be earthed if is armoured. The Cable will be having different cores, with a PVC Insulation and armour is Steel either circular shape or flat sahpe. The wires will be connected to the respective circuits. The armour will be earthed through the Gland and body earthing.

An unearthed cable is unarmoured in which there will be any earthing for the cables.

Regards,

N.Suresh

a single phase cable earthed will have 3 wires one for phase the other for neutral and the third one for earthing. un earthed will not have the third wire

A 3 phase cable earthed will have 4 or five wires . 3 for the phases one for the neutral and the fifth or the armouring for earth .

i would suggest you to dig out such basic information from a electrical text book.

Hi Maharaja,

The answers given relating to the use of cables for earthed or unearthed systems are very pertinent and good.

regds

Gnanasambandam

email ID ; vgs.nadi@gmail.com

Very good answer.Hope your concept is very clear

Since your question is rather vague, do you mean the difference between earth-screened cables and standard unearthed cables?

Earth-screened cables are like standard cables but incorporate a braided or stranded metallic screen (commonly copper) around it (very similar to a coaxial TV aerial cable). This screen is (generally) connected to ground as a protective measure to provide additional electrical and touch-safe protection to the cables.

Try a google search.

I think you mean, "screened cables". Each conductor inside a high-voltage screened cable has an earthed screen, usually metallized gauze or conductive polymer, surrounding the insulation. This equalizes electrical stress on the cable insulation.

The need to equalize electrical stresses inside the cable became apparent in the 1930's, when high-voltage distribution cables began to fail for no apparent reason. The cause of these failures was determined to be the concentration of electric stress that exceeded the dielectric strength of the insulation. Covering the insulation of each conductor in the cable with an earthed screen eliminated those localized electric stresses and solved that particular problem.