electricity power outage or blackout emergency turning on or off circuit breaker on electrical fuse board

appliance automatic blackout blown board box breaker build cabinet cable candle checking circuit connection construction consumer consumption control current cut dark darkness device distribution domestic electric electrical electrician electricity emergency energy engineer failure fault faulty flashlight fuse fusebox fused hand home house industry inspecting installation light mains man meter night outage outlet panel people phase power protection rcd repair residual savings secure service supply switch switchboard system technology test torch tripped turning unit volt voltage watt working