Armoured cables are hugely important in modern electrical installations as they provide greater protection and durability. These cables are designed to withstand physical threats, such as mechanical damage, and environmental conditions such as harsh weather, ensuring the safe and reliable transmission of electrical power and signals.
At Cableworld, we’re one of the leading suppliers of high-quality armoured cables in the UK, providing solutions tailored to various needs. In this guide, we’ll be explaining what armoured cables are, their uses, and the benefits they offer.
What is Armoured Cable?
Armoured cable is a type of electrical cable reinforced with a metal sheath, which provides additional protection against physical damage. The basic structure of an armoured cable includes:
Inner Conductors: These are the wires that carry the electrical current.
Insulating Layer: Surrounds each conductor to prevent electrical shorts.
Protective Armour: Typically made of steel or aluminium, this layer shields the inner conductors from mechanical damage and external pressures.
Outer Sheath: An additional layer that protects the cable from environmental factors.
The protective armour is essential for preventing mechanical damage, maintaining the integrity and safety of the cable even in harsh conditions. This makes armoured cables suitable for environments where they may be exposed to physical impacts, moisture, chemicals, and extreme temperatures.
Benefits of Armoured Cable
Reliable Performance
Armoured cable maintains consistent performance in both commercial and residential settings, even under challenging conditions. This reliability is crucial for maintaining the integrity of electrical systems and reducing the risk of electrical failures.
Long Lifespan
The robust construction of armoured cables makes them durable, withstanding harsh environments and reducing the need for frequent replacements, compared with other types of cable.
Resistance to Moisture, Chemicals, and Extreme Temperatures
Armoured cables are designed to resist environmental factors that can degrade other types of cables, making them ideal for outdoor and industrial applications.
Types of Armoured Cable and Their Applications
Steel Wire Armoured (SWA)
SWA cable features steel wire armouring that provides high mechanical protection. It is commonly used in underground systems, power networks, and outdoor lighting installations. The steel wire armour makes it suitable for direct burial and areas where high durability is required.
Aluminum Wire Armoured (AWA)
AWA cable uses aluminium wire armouring, making it lighter than SWA cable. It is often used in power transmission over long distances where lower weight is important.
Steel Tape Armoured (STA)
STA cable is designed with steel tape armouring, offering a thinner protective layer. It is typically used in indoor and buried applications where space is limited but protection is still needed. STA cables are ideal for installations within buildings or where the cable needs to be embedded in concrete.
When Should You Use Armoured Cable?
Armoured cable is designed for environments where electrical wiring faces a higher risk of mechanical damage, interference, or exposure to harsh environmental conditions. This could be construction sites, for example, where cables may be subjected to physical impacts.
Armoured cable is also ideal for areas exposed to extreme temperatures, moisture, chemicals, or other potentially damaging conditions, such as industrial settings.
Armoured Cable Applications
Outdoor Installations
Armoured cables are ideal for outdoor applications due to their robust protection against environmental elements. Here are some examples of where armoured cable might be used outdoors:
Underground Routes
The durability and protective features of armoured cables make them perfect for underground installations. Armoured cables shield internal wires from moisture, soil corrosion, and physical damage caused by digging or other ground activities. They offer a safe and reliable solution for transmitting power and signals underground, ensuring longevity and performance.
Areas Prone to Mechanical Damage
Armoured cables are essential in environments where cables might be exposed to potential mechanical damage, such as:
Factories
Warehouses
Construction Sites
Public or High Traffic Areas
For safety and durability, armoured cables are recommended in places with high likelihood of interference or physical impact, such as schools, hospitals, offices or other public buildings with high amounts of traffic.
Armoured Cable FAQs
What's the difference between SWA cables and AWA cables?
The primary difference is in their armouring material. SWA (Steel Wire Armoured) cables use steel wire for armouring, providing high mechanical protection. AWA (Aluminium Wire Armoured) cables use aluminium wire, making them lighter and suitable for applications where weight is a concern.
Is armoured cable necessary for all outdoor electrical installations?
While not necessary for all outdoor installations, armoured cable is highly recommended for environments where there is a risk of mechanical damage or exposure to harsh environmental conditions.
Can armoured cable be used underground?
Yes, armoured cable is specifically designed for underground installations. Its robust construction protects against moisture, soil corrosion, and physical damage, making it safe for direct burial.
How do you cut armoured electrical cable?
While several tools can be used, the best option is to use dedicated cable cutters designed for armoured cables. Measure the required length, mark the cutting point, adjust the blade depth correctly, and carefully make the cut to avoid damaging the inner conductors.
Do I need armoured cable for outdoor lights?
Using armoured cable for outdoor lights is highly recommended. Outdoor lighting installations are exposed to various environmental factors such as rain, snow, and extreme temperatures, which can compromise the safety and functionality of electrical wiring.
