This term is always raised whenever a question arises of wiring. This is a very important component of the electrical wiring systems. An armoured cable is basically a power cable that is made up using 2 or more than 2 electrical-conductors. It is held together with the help of a sheath. It has a high protective covering that is very useful in the safe transmission of electricity. This becomes even more important in case of underground transmission needs. However, these cables can be used with in the buildings, overhead, or exposed. These are available from a single cable type to multi conductor cable type.
In precise, it is a galvanised or steel wire armoured cable that is wound over insulators and conductors. Often these possess an outer plastic covering called sheath for underground feeders and for main power supply.
A galvanised or steel wire armoured cable is very significant because of the highest level of protection offered by it. It helps in smoothly carrying out a very risky task of transmission of electricity. It is also said that these possess great earthing capabilities as it acts as a CPC or a Circuit Protective Conductor.
In case of the single conductor type, the sheath just gives protection and thus it should not be earthed on both the ends. In this when both of the ends are grounded, a current circulates from the armour to the ground and back again. This can be called as circulating sheath current. When only one end is grounded, any voltage that is induced into the covering is emitted without forming a circulating current.
The single core cables lack the magnetic fields that are generated by the rest 2 phases. The sum of the 3 magnetic fields in a three phase cable is zero. As there is no cancelling effect in case of a cable with single core, the voltage gets induced in the armour through the conductora€?s surrounding magnetic field.
To make sure that there is no problem, a one-conductor metal cable that have lead, stainless steel, copper, or aluminium armours has to be bonded to the ground, generally done at the source end. The rest of the length is isolated from the ground.
These cables are widely used for various residential and commercial purposes. Safety is so very essential with respect to transmission of power. Moreover, for any industrial concern to be successful, power and safety are the two basic ingredients. There are various different types of this protective cable that one can find. Make a choice according to the requirements. There is also lots of information on these available on the internet. It is also suggested to go for a reputed supplier of electric cables to obtain these.
