Armored and Non-armored cables: How to Choose?

The most notable feature of armored cables is that a strong metal protective layer is added between the insulation layer and the outer sheath. This layer of armor is usually closely woven or wound with materials such as galvanized steel wire, steel strip or aluminum strip, endowing the cable with strong protective capability:

1) Resistance to external force damage: This layer of metal armor serves as the "bulletproof vest" for the cable. It can effectively resist mechanical compression, puncture by sharp objects, pulling deformation, and even prevent gnawing by animals such as rats. Armored cables are a reliable choice in construction sites, mining areas, underground direct burial sites or places that may be subject to external force impacts.

2) Shielding electromagnetic interference: The metal layer naturally has an excellent electromagnetic shielding effect. In factory workshops (filled with frequency converters and large motors), near substations or in environments with precision instruments, it can prevent external electromagnetic noise from invading and also prevent internal signals of cables from leaking and interfering with others, ensuring clear and stable data transmission.

3) Adaptability to harsh environments: Thanks to this additional layer of protection, armored cables can better withstand moisture, chemical corrosion (when the appropriate outer sheath is selected), high temperatures and other harsh conditions, and have a longer service life. Therefore, it is widely applied in harsh scenarios such as power transmission trunk lines, petrochemicals, underground mines, rail transit, and submarine laying.

Non-armored cables are the most common type of cable structure we often see. It is mainly composed of an internal conductor (copper or aluminum), an insulating layer that wraps around the conductor, and the outermost sheath (such as PVC or LSZH low smoke zero halogen material), without a metal armor layer in the middle. This makes it have the following characteristics:

1) Light weight and easy to bend: Without the heavy metal layer, non-armored cables are very light and flexible. It is easier to thread pipes and wind wires in narrow Spaces or flexibly wire between equipment rooms, greatly reducing the installation difficulty and labor costs.

2) More economical cost: With a simple structure and less material usage, non-armored cables usually have a price advantage over armored cables, making them an ideal choice for budget-sensitive projects.

3) Applicable to conventional environments: In indoor environments such as offices, family residences, shopping malls, and data center computer rooms, or in dry conditions without strong external pressure or severe electromagnetic interference, non-armored cables can fully meet the daily power transmission and signal connection requirements. It is also the main force in indoor lighting, socket circuits and internal connections of equipment.

The key to choosing between armored and non-armored cables lies in matching the actual needs:

1) Consider the usage environment: This is the primary consideration. Is there a risk of the environment being crushed, broken or worn by heavy objects? Are there any strong sources of electromagnetic interference? Has it been exposed to moisture, corrosion or high temperatures? If the answer is affirmative, the physical and electromagnetic protection provided by armored cables is indispensable. If the environment is safe and controllable (such as in a regular indoor setting), non-armored equipment is sufficient.

2) Consider budget constraints: Armored cables, due to their more complex materials and manufacturing processes, usually have a higher cost than non-armored cables. Under the premise of meeting safety and performance requirements, the budget is also an important basis for decision-making.

3) Consider installation space and flexibility: If the wiring path is narrow, there are many elbows, and frequent movement or adjustment is required, the lightweight and flexible advantages of non-armored cables will be demonstrated. Armored cables can also be installed in spacious areas with straight paths.

4) Consider the signal quality requirements: For applications involving the transmission of critical data, high-fidelity audio and video signals, or precise control instructions, the electromagnetic shielding capability of armored cables is crucial for ensuring signal purity and reducing bit errors.

Armored cables, with their sturdy "armor", safeguard the energy and information channels in harsh environments. Non-armored cables, with their lightweight and economical "everyday wear", support the electrical veins of our daily lives. There is no absolute superiority or inferiority among them. The key lies in recognizing the requirements and precisely matching each connection task. Mastering the characteristic differences between these two types of cables can make the transmission of power and signals safer, more stable and more efficient, laying a solid and reliable foundation for the smooth operation of modern society.