Final answer:
It is generally false that three distribution wires connected to one fuse or breaker is acceptable, as this can lead to safety risks. Wiring systems typically employ a three-wire setup with protection through a single fuse or breaker for each circuit, and additional safety devices like GFCIs and isolation transformers.
Step-by-step explanation:
In most cases, it is false that three distribution wires connected to one fuse or breaker is acceptable. Each circuit is usually designed to have only a single set of wires, typically one live wire and one neutral wire, protected by a single fuse or breaker to prevent overcurrents which could lead to thermal hazards. The three-wire system described in the references ensures safety by utilizing a live/hot wire, a neutral wire, and a ground wire.
The circuit breaker or fuse is in series with the live/hot wire to protect against thermal overload. This three-wire system is integral to protecting against both thermal and shock hazards in a circuit.
Furthermore, safety features such as ground fault circuit interrupters (GFCI) and isolation transformers are essential in modern electrical systems to prevent electrical shock by detecting current loss to unintentional paths and by isolating the device from the source respectively.