Choosing the right cable or wire doesn’t have to be complicated, but it does mean knowing what actually matters for your specific setup. Rather than looking at everything at once, it’s easier to break the decision down into a few key questions.
1. How will the cable be used?
Start by thinking about movement.
If the cable will be installed once and left in place (for example, inside a wall or control panel), a solid conductor is usually the best option. It’s more rigid and holds its shape well over time.
If the cable will be moving, bending or exposed to vibration, go for a stranded conductor. These are much more flexible and far less likely to break under repeated motion.
2. How many connections do you need?
This determines whether you need a single-core or multi-core cable.
- Single-core cables are typically used inside equipment, panels or machines where only one electrical path is required.
- Multi-core cables bundle multiple conductors together, making them ideal for powering or controlling more complex systems like appliances or industrial equipment.
3. Will interference be an issue?
In environments with lots of electrical noise, such as factories or near heavy machinery, signal interference can become a problem.
That’s where screened (shielded) cables come in. They protect the signal inside the cable from external interference and stop the cable itself from emitting unwanted noise.
Depending on the level of protection needed, you’ll come across options like foil, braided or combined shielding.
4. What environment will the cable be in?
This is one of the biggest factors. The outer sheath of the cable needs to handle whatever conditions it’s exposed to.
Here are some common materials and where they work best:
PVC
A reliable, cost-effective all-rounder with good insulation and durability
Rubber
Great for outdoor use or wet environments; tough and flexible
PTFE
Best for extreme temperatures and harsh chemicals
PE
Common in communication cables, especially where UV resistance is needed
LSZH
Ideal for enclosed or public spaces, as it produces less smoke and toxic fumes in a fire
PET
Used where a combination of mechanical strength, chemical resistance and temperature stability is needed
Choosing the wrong sheath can shorten the cable’s lifespan dramatically, so it’s worth getting this part right.
5. Does it need to meet any standards?
Depending on the application, certifications may be essential rather than optional.
Some of the most common include:
- BASEC – Confirms compliance with British and international cable standards
- UL – Globally recognised safety certification
- DEF STAN – Used for military and aerospace-grade cables
- Tri-rated – Approved for use across the UK, USA and Canada
- RoHS & REACH – Ensure the cable meets environmental and chemical safety regulations
If you’re working on regulated projects or exporting products, these can be critical.
6. What type of cable do you actually need?
Once you’ve worked through the points above, choosing the category becomes much simpler:
Final thought
The “right” cable isn’t just about performance, it’s about matching the cable to the environment, movement and standards required. Get those three things right and everything else tends to fall into place.
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