Extension leads and multi-way power strips are found in almost every commercial premises, yet they're frequently overlooked in electrical safety planning. Ironically, they're among the most commonly failed items when PAT tested — and faults in extension leads can affect every appliance connected to them.
Why Extension Leads Fail PAT Tests So Frequently
- They're moved regularly, causing cable damage at the point of connection
- They're frequently run under carpets or furniture, which damages insulation
- Many are not rated for the electrical load they're asked to carry
- Cheap or counterfeit extension leads may not meet UK safety standards
- The plug connection point is subject to repeated insertion and removal
- They may have been modified or repaired incorrectly
The Danger of Overloaded Extension Leads
Overloading is one of the most dangerous hazards associated with extension leads. Each socket outlet in the UK is typically fused at 13 amps, providing a maximum of about 3,000 watts. If the combined load of all appliances connected to a multi-way extension lead exceeds this, the lead can overheat and potentially catch fire. High-power appliances — heaters, kettles, microwaves — should always be plugged directly into wall sockets.
What PAT Testing Checks on Extension Leads
Extension leads are subject to the same visual inspection and electrical testing as other appliances. The visual check examines the cable, plug, and socket cluster for damage. Electrical tests check insulation resistance and earth continuity. The correct fuse rating is also verified — many cheap extension leads are fitted with 13A fuses, when a lower rating would be more appropriate.
When to Replace Rather Than Repair
Given the relatively low cost of a quality extension lead, replacing failed or damaged leads is almost always more cost-effective than repair. When replacing extension leads, choose products that are properly rated (look for BS 1363 or BS EN 60884), avoid the cheapest options, and ensure you're buying from reputable retailers. Replacement costs far less than dealing with an electrical fire.
