Every time the question of building wiring is raised, one comes throughout the time period ‘Armoured Cables’. After all, what’s armored cable and why is it so vital for electrical wiring systems. Let’s know about it.

Armored Cable Definition

Armored cable is an influence cable made up by assembling two or more electrical conductors, generally held collectively with an general sheath. This electrical cable with high protective covering is used for transmission of electrical energy, particularly for underground wiring needs. However, these cables may be put in as permanent wiring within buildings, buried in the ground, run overhead, or might even be kept exposed. They are available as single conductor cable as well as multi-conductor cables.

To be more precise, armored cables may be explained as electrical cables with stainless steel or galvanized wire wound over the conductors and insulation. They usually have an outer plastics sheath for major distribution supply and buried feeders.

Why is Armored Cable Significant?

As could be made out from its name itself, armored cable is significant as a result of final protection it provides keeping in view essentially the most risky job of electricity transmission. It acts as a circuit protective conductor (CPC) and thus provides earthing to the equipment equipped by the cable. However, its earthing capability has been a much debated subject.

Armoured Cable Earthing

A single conductor armoured cable doesn’t have a ground wire. Its sheath is only for protection purpose. Due to this fact it is always beneficial that one core armor cable should not be earthed on each ends. When each the ends are grounded, a “circulating sheath present” can flow between the armour, to ground then back to the armour. Grounding only one finish is meant to allow bleeding of any voltage that may be induced into the sheath without creating a circulating current.

Single core armoured cables do not have magnetic fields generated by the opposite two phases. In a 3 part cable, the sum worth of the three magnetic fields is zero. In a single core cable, there isn’t any “cancelling” impact and subsequently a voltage will be induced in the armour by the magnetic discipline surrounding the conductor.

To stop any kind of problem, a single conductor metallic armoured cable having lead, aluminum, stainless steel, steel or copper armors must be bonded to ground, normally on the supply end, then isolated from ground along its length.

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