Water, gas, electricity and heating supply systems; minor repairs
Water supply networks are dead-end, ring or combined. A dead-end network is built in ordinary buildings; if the network fails, supply can stop. A ring network supplies high-rise buildings without interruption because it is joined to the outer pipe in several places and water keeps coming even if one is cut off. A home’s gas supply includes carrying and distribution pipes, flow control equipment, a gas meter and gas appliances. Gas pipes run through kitchens, corridors and other rooms not used for living; running them through a toilet or bathroom is forbidden. An electricity supply diagram consists of a circuit breaker, a meter, a residual-current device, sockets and switches; only a specialist installs it. Safety: if you smell gas, make no flame, touch no electric switch, open windows, leave the flat and call the gas service (104 in Uzbekistan); a child never repairs gas equipment or wiring. Minor faults in valves and taps, such as a dripping tap, are usually due to a worn rubber washer; an adult closes the water valve first and then replaces it. A pupil may help with such a job and learn the order of work, but does not touch gas or electrical equipment.
Safety role play: groups act out three situations (a smell of gas, a dripping tap, a sparking socket) and show the right action. Real gas, electric and water fittings are not touched.