Cables Armed & Shield

Two different things with two different purposes. A shield is used to provide a zero reference ground plane for electrostatic and/or electromagnetic purposes. Armored cables have a protective covering to provide mechanical strength/protection to the interior cable, which may or may not be shielded.

To summarize, shielded cables may or may not be armored, and armored cable may or may not have shielded cable inside.

dear sir

but the armored connected to earth across the gland of cable Does it provide a zero reference ground plane for electrostatic and/or electromagnetic purposes

thanks a lot

Good question. The armor's primary purpose is mechanical protection, check this out:

http://en.wikipedia.org/wiki/Steel_wire_armoured_cable

For more information we need to know the voltage class, use, and what your true concern is.

dear sir

cable size 16x2.5mm2 its used for secondary current for current transformer in 400kv switchyard the cable have armored & shield

please can we use cable have only armored with out shield

regards

No. You should not.

Armed cable is what they need to prevent copper theft....

--Ed. C.

Very true, We can now dispense with the services of an armed security guard. The inventor should be considered for the Noble prize.