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yun yang's Blogs >> yyang What is Armored Cable?

Whenever the question of building wiring is raised, one comes across the term 'Armoured Cables'. After all, what is armored cable and why is it so important for China Electric Wire
systems. Let's know about it.

Armored Cable Definition

Armored cable is a power cable made up by assembling two or more electrical conductors, generally held together with an overall sheath. This electrical cable with high protective covering is used for transmission of electrical power, especially for underground wiring needs.

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

Why is Armored Cable Significant?

As can be made out from its name itself, 15kV Three Core Armored Power Cable
is significant due to the ultimate protection it provides keeping in view the most risky job of electricity transmission. It acts as a circuit protective conductor (CPC) and thus provides earthing to the equipment supplied by the cable. However, its earthing capability has been a much debated subject.

Armoured Cable Earthing

A single conductor armoured cable does not have a ground wire. Its sheath is only for protection purpose. Therefore it is always recommended that one core armor cable should not be earthed on both ends. When both the ends are grounded, a "circulating sheath current" can flow between the armour, to ground then back to the armour. Grounding only one end is meant to allow bleeding of any voltage that might be induced into the sheath without creating a circulating current.

Single core armoured cables do not have magnetic fields generated by the other two phases. In a three phase cable, the sum value of the three magnetic fields is zero. In a single core cable, there is no "cancelling" effect and therefore Triplex Service Drop Cable


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