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The Electrical Safety Foundation International says extension cords aren't designed as permanent wiring and can degrade when left connected continuously. Unplugging a cord after use gives owners a chance to spot cracked insulation, loose connections or overheating plugs before they become hazards.
Britain's government has moved to permit plug-in solar kits, but the Institution of Engineering and Technology says the country's electrical infrastructure wasn't built for it. IET technical regulations head Mark Coles says many homes still use older Residual Current Devices designed only for one-way power flow, which can fail or burn out when solar feeds electricity back through them. The IET issued its own warning the same day as the government's announcement, urging homeowners to get professional wiring checks before installing any system.