Extension leads are useful for temporary flexibility, but they can become a problem when they are treated as a permanent substitute for enough wall sockets. The total electrical load matters, not simply the number of spare holes on an extension block.
Do not daisy-chain extension leads
Plugging one extension lead into another can increase the risk of overloading the wall socket and creates additional connections that can be damaged or loosened. Use one suitable extension lead per socket rather than chaining them.
High-power appliances need care
Heating appliances and other high-power equipment can use a large proportion of the capacity available. Follow the appliance and extension-lead instructions rather than assuming several devices can safely share one extension.
Cable reels
A cable reel may have a lower permitted load while wound because heat cannot dissipate as effectively. Follow its marked ratings and manufacturer instructions.
A permanent solution
If a room permanently depends on several extension blocks, it may be worth asking an electrician whether additional fixed sockets can be installed safely.
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