Understanding Cable Types for Commercial and Industrial Applications

It would be easy to assume that the task of selecting the correct cable for a given industrial or commercial system would be almost entirely about performance. However, this isn’t quite true; such factors as safety, compliance, and reliability are of critical importance, too.

Whether a given engineer or technician is involved in powering a warehouse, factory machinery, office lighting, or a data centre, they must ensure the installation complies with BS 7671, otherwise known as the IET Wiring Regulations.

Furthermore, compliance needs to be achieved in relation to other relevant British and harmonised standards such as BS 5467, BS 6724, and BS EN 50525.

How Well Do You Know Your Cables and Wires?

Even putting aside the compliance aspect, picking the wrong specification of cable for an application can lead to mechanical failure, signal interference, or severe fire hazards.

So, let’s help you feel better-informed and more strongly positioned to make the right decisions. Below, we’ve outlined various types of cables and wires that see widespread use across commercial and industrial projects in the UK.

1. Power And Mains Distribution Cables

These cables are very much the backbone of any facility. This status is attributable to their ability to handle high current loads and provide physical protection.

• Steel Wire Armoured (SWA)

SWA cables are the industry standard for mains supply and underground cabling. Sure enough, they’re a common sight across factories, warehouses, and construction sites, and as mains supply to outbuildings or plant rooms.

These cables are known for their galvanised steel wire layer, which provides excellent mechanical protection against impact, crushing, and rodents.

This helps to make SWA cabling an ideal choice for direct burial, underground ducts, outdoor runs, or exposed industrial environments.

• 6491X (Conduit Wire)

This single-core cable is typically used within steel or plastic conduits in commercial settings. It is perfectly suited for internal wiring where maintenance or future modifications are anticipated.

2. Control And Automation Cables

Industrial machinery requires flexible cables that are able to withstand movement and electromagnetic interference (EMI).

• YY Cables

These unshielded and highly flexible cables are used for signal and power in dry or moist indoor conditions.

• CY Cables

The screening of these cables with a tinned copper wire braid allows them to provide effective protection against EMI. As a result, they are essential for automation and precision control.

• SY Cables

These cables are similar to the aforementioned CY, except that they sport a galvanised steel wire braid for greater mechanical strength. They are suitable for internal wet or damp environments.

3. Data And Communication Cables

Today’s commercial infrastructures depend on high-speed data transmission, where the “Category” (Cat) determines the bandwidth.

• Cat6 And Cat6a

These cables are the standard for UK offices. Cat6a is often favoured for new installations, given that it supports speeds of as much as 10 Gbps over a full 100-metre run, in addition to providing superior futureproofing.

• Fibre Optic

Playing an essential role in backbone networks and data centres, fibre optic cables offer immunity to EMI, as well as better long-distance speed than copper.

• Coaxial (RG6/CT100)

These 75-ohm shielded cables are designed to transmit high-frequency signals in CCTV and satellite systems. They feature a solid copper core, foam dielectric, and double-screening (foil/braid), which makes them ideal for Sky TV, Virgin Media, and digital aerial installations.

What Else Do You Need to Consider for Your Latest Installation?

Such factors as the environment the cable will be used in, the level of flexibility your project requires, and safety standards will inform your efforts to choose the right cables for your installation.

Don’t forget to always check current-carrying capacity tables in BS 7671 Appendix 4, taking into account installation method (clipped direct, in conduit, buried, etc), ambient temperature, and grouping. Also be sure to remember voltage drop limits, which are typically 3% for lighting, and 5% for other loads.

Making the best-informed choice of cable for your application will go a long way to preventing overheating, mechanical failure, and/or non-compliance fines.

Are you still in doubt about the optimal choice of cable or wire for your application? If so, we urge you to look at the latest IET Wiring Regulations guidance, or to seek advice from a qualified electrical engineer.