Heaters and the home network

In a home network devices are connected in parallel, so each gets 220 V and switching one off does not affect the others. The network has two wires: a phase wire (with dangerous voltage) and a neutral wire; both must be treated as dangerous. If the circuit is overloaded or shorted, the current grows and wires can heat up and start a fire; to prevent this a fuse is installed: when the current exceeds the allowed value, the thin wire inside it melts and breaks the circuit. Industry often uses a three-phase 380 V network. Connecting, replacing or repairing a plug, socket or lamp holder is done only by adults or an electrician; children must not put anything into a socket or touch electrical devices with wet hands.