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Extension cord and power strip safety: six checks to prevent hazards

Check ratings, damage, overload and hidden cables; high-power heating equipment needs suitable direct wall connections.

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Wikimedia Commons · Santeri Viinamäki, Schuko Power Strip, CC BY-SA 4.0, via Wikimedia Commons; unmodified direct image. · CC BY-SA 4.0 ↗

Extension cords and power strips are useful temporary accessories, not substitutes for permanent wiring. This guide follows ESFI household safety advice. Check local electrical ratings and certifications; leave repairs and new outlets to a qualified electrician.

Your try-it-at-home checklist

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1. Before use, inspect plugs, sockets and cable jackets for cracks, exposed wires, discoloration or looseness. Stop using damaged items and replace or seek qualified help.
2. Read the strip's voltage, current and power rating, and keep the combined load within its limit. Match the local plug standard and certification.
3. Do not daisy-chain power strips or extension cords. Use extension cords temporarily rather than as a substitute for fixed wiring.
4. Never route cords under rugs or furniture, through doors or inside walls; compression, abrasion and trapped heat can create hazards.
5. Avoid ordinary strips and extension cords for space heaters or other high-heat and major appliances. Follow each appliance manual and connect directly to a suitable wall outlet.
6. If cords feel hot, smell burnt, spark, buzz or trip breakers repeatedly, disconnect power safely and stop use. Do not open or repair wiring yourself; call a qualified electrician.

Electrical Safety Foundation InternationalExtension Cord Safety Tips ↗ESFI advises checking ratings and damaged insulation, temporary only, no daisy chaining, no routing through rugs/doors/walls, and direct wall connection for high-power devices.Electrical Safety Foundation InternationalDon't Overload Your Home ↗ESFI guidance on electrical overload warning signs, power strip outlet count not increasing circuit capacity, and qualified electrician repairs.Electrical Safety Foundation InternationalReaching to Safety: Use Extension Cords Properly ↗Specific source on checking damaged cables, proper current ratings, avoiding covered cables and no heaters on cords or strips.

Your try-it-at-home checklist

Further reading

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