How should a charging cable’s strain relief be inspected?

Main answer · Wecent Editorial Team

Short answer: Look and feel along the first few centimetres next to each plug. Replace the cable if the cover is cracked, split or pulling away, if the wire is exposed or kinked, if the plug is loose or hot or if charging cuts out when you move it. A cable with a damaged strain relief can fail and heat up, and it is not worth the risk.

What the strain relief does

The strain relief is the flexible cover where the cable enters the connector. It spreads bending along a longer length so the wires inside do not snap. It takes most of the wear in daily use.

What to look for

1. Cracks or splits. Even small cracks can grow.
2. Whitening or stiffness. The material is ageing.
3. Gaps between the cover and the plug. It is pulling away.
4. Exposed wire or shiny conductor. The outer layer has failed.
5. Kinks. A permanent bend near the plug.
6. Heat marks. Discolouration or softness.
7. Loose plug. The plug moves relative to the cable.

Simple checks

• Run your fingers gently along the cable near each plug and feel for lumps or soft spots.
• Bend the cable gently, not sharply, and watch the strain relief. It should flex smoothly.
• Charge and move the cable slightly. If charging cuts out, the wires may be broken.
• Check that the plug and cable are not hot after charging.

What to do

• Replace the cable if you see any serious sign.
• Do not wrap tape around a damaged cable as a long-term repair.
• Unplug the cable if you see sparks or smell burning, and do not use it.

How often

Look at cables you use daily every month or two, and at once if you see anything odd.

Prevention

Do not wrap cables tightly, pull them by the cable, or charge while the phone hangs from the plug. Choose cables with long, flexible strain relief.

For brands

Include a short inspection tip in the manual, and offer easy replacement for customers who report damage.

Quick summary

Look and feel near the plugs, and replace any cable with cracks, exposed wire or heat.

Keep a spare ready

Keep a known-good spare cable at home and in the bag. Then when an inspection shows a damaged cable you can replace it immediately, instead of using it for another few days because nothing else is at hand. Dispose of the old cable with electronics recycling.

Where this answer says to confirm with Wecent, the detail is not published on the product page and has to come from the datasheet or the factory. General facts come from the regulators, standards bodies or device makers named in the text.