Why is my wire insulation crumbling and what should I do – Advice from Electriman, North London Electricians

## What Does Crumbling Wire Insulation Mean?

If you've noticed the plastic or rubber coating on your wires is flaking, cracking, or turning to dust, your wiring has reached the end of its safe service life. This is one of the most serious electrical faults a UK home can have.

**Why does insulation crumble?**

- **Age:** Rubber-insulated wiring used before the 1960s has a lifespan of around 25–40 years. Many UK homes still have it hidden in walls and under floors.

- **Heat damage:** Overloaded circuits, proximity to hot pipes, or poor ventilation cause insulation to harden and crack over time.

- **PVC degradation:** Even modern PVC cables can become brittle if exposed to UV light, chemicals, or extreme temperatures.

- **Rodent damage:** Mice and rats chew through insulation, especially in lofts and underfloor voids.

- **Moisture ingress:** Damp environments accelerate insulation breakdown, particularly in older properties.

**What are the risks?**

Exposed conductors can cause:

- **Electric shock** if touched

- **Electrical fires** from arcing between conductors or to earthed metalwork

- **Failure of RCD protection** if insulation resistance has dropped

**What should you check — safely?**

- **Do not** pull at cables or remove any covers

- Look in accessible locations like the loft, under the stairs, or behind loose socket faceplates

- Check whether your property has old **black rubber cables** or **lead-sheathed wiring** —

Need a qualified electrician in North London?

Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.