A basement or storage room electrical line should be planned for moisture, dust and poor ventilation. A random extension cord or ordinary socket is not a safe permanent solution in these conditions.
Use moisture-resistant sockets, suitable cable, protective conduit, a dedicated breaker and leakage protection. Sockets should not be installed close to the floor or in places where water can collect.
If a socket is warm, a breaker or RCD trips often, lights flicker or moisture marks appear inside a junction box, the line should be checked. Safety protection should not be bypassed; the fault must be found.
