What is The Difference Between Armoured and Unarmoured Power Cables?

09 Nov.,2022


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The difference between armoured and unarmoured cables is that there is an extra layer of metal reinforcement, and the common armouring methods are steel belt armouring and steel wire armouring, of which steel wire armouring is divided into fine and coarse steel wire armouring.

First of all the concept is different, armoured cables: are made of different material conductors packed in a metal sleeve with insulating material and are processed into a solid combination that can be bent. Non-armoured cable: A cable without an armouring protective layer, consisting of several conductors or groups of conductors twisted together in groups of at least two each to form a rope-like cable, each group of conductors being insulated from each other and often twisted around a central, highly insulating covering over the whole.

The second use is different, armoured cable: generally used in buried situations, cable trench laying or direct burial need armoured cable. This is also to better protect the cable, can better prevent damage. Non-armoured cables: In addition to the buried situation, the basic use of non-armoured cables, which is also from the economic convenience to consider, high-quality non-armoured cables have been able to meet the needs of power transmission.

The structure is also different. The outer protective layer of armoured cable is made of steel tape or steel wire, which is used to protect the cable from external mechanical damage; it can also prevent rats and termites from biting and causing power transmission problems, and the bending radius of the armour is large and the armour layer can be grounded to protect the cable. The non-armoured cable, also known as cross-linked cable, is made of cross-linked polyethene material outside the cable conductor insulation layer.

The cable code is also different, the code of armoured cable is expressed in the ordinary cable + numbers, the front one "2" means double steel belt armoured; the second "2" means PVC sheath, such as with polyethene sheath to "2" can be changed to "3". For example, YJV stands for ordinary cable, YJV22 stands for armoured cable.

What are the advantages of armoured cables compared to unarmoured cables?

1. Armoured cable mechanical protection layer can be added to any structure of the cable to increase the mechanical strength of the cable and improve the erosion prevention ability, it is a wire and cable designed for the areas which are vulnerable to mechanical damage and highly susceptible to erosion. It can be laid in either way, where steel belt armoured cables are generally laid flat to withstand external forces in the horizontal direction, and steel wire armoured cables are mostly used in vertical shafts and other places where vertical installation is required. 

2. Cable with armour layer can also enhance the tensile strength, compressive strength and other mechanical protection to extend the service life.

3. Armored cable has a certain resistance to external forces, but also to prevent the rat bite, not through the armour to cause power transmission problems, armour bending radius to be large, armour layer can be directly grounded to protect the cable.

Armoured cable type classification

Control cable armoured cable models are KVV22, KVVP22, KYJV22, KVV32, KYJV32

Power cable armoured cable models are YJV22, YJV32, VV22, VV32

Armoured communication cable models: HYA53, HYAT53, HYA23, HYV22, HYA22 (rat-proof, buried)