With the rapid development of electrical energy, more and more cables are being used in various environments. But what about harsh conditions? In that case, it is important to ensure that your cables operate smoothly and reliably when transmitting electrical power. As the name suggests, armored cables are protected against mechanical damage, while unarmored cables are not. What is the difference between them? Why should we choose armored cables instead of unarmored cables?
Initial Overview of Armored Cable
An armored cable has an additional protective layer that prevents it from being cut or worn. The armor of a coaxial cable is a corrugated aluminum foil sheath, such as corrugated metal, to provide flexibility, and both the inner and outer parts of the sheath are coated with a waterproof compound that prevents moisture from penetrating and damaging the cable. The internal structure of a 4-core armored cable consists of several layers to prevent cable damage. The outer sheath protects against rodents, abrasion, and twisting, and is usually made of plastic. Armoring materials are mainly derived from steel and aluminum foil and are designed to protect the armored cable from stretching during installation.
Difference Between Armored Cable and Unarmored Cable
Structure - Many people may think that armored cables only have metal protection. Strictly speaking, the armor material does not have to be metal; it can be fiber yarn, glass yarn, polyethylene, etc. The only difference between armored fiber optic cables and unarmored cables is that armored cables have an additional outer layer to protect the cable. 4-core armored cables tend to be more expensive than unarmored cables, while steel tape and aluminum armored cables are cheaper than other armored cables often used in special applications.
Application - Armored cables are installed in areas vulnerable to mechanical damage, such as external walls, as an alternative to conduit. Armored cables usually have a small metal strap to ensure electrical continuity to the safety ground. (You must also run a separate grounding wire in flexible conduit; you cannot rely on conduit continuity.) In special cases, 4-core armored cable is preferred. Cheaper unarmored cables can be installed in walls and other protected areas. Armored cables are mainly used in control systems.
Why Are Armored Cables Used Instead of Unarmored Cables?
There are several reasons for using armored cables. The main reason is durability, as armored cables have been used more widely over the past few decades, with cables being buried directly in the ground instead of being run through conduit. Today, most local municipalities require trenches to be dug before installing network components, which eliminates the need for unarmored cables in most applications. Secondly, rodents or animals can and will bite cables, so armor protects the cable from animal or shovel damage in direct burial applications. Thirdly, the least common reason for its use is in environments with various animals, where the armor can provide another layer of protection when grounded.
Conclusion
An armored cable can be thought of as a reinforced cable that is stronger and more durable than a standard cable. A 4-core armored cable provides unparalleled protection against physical damage without compromising the flexibility or functionality of the transmitted power, making it an excellent addition to any power transmission in a hazardous environment.
