Final answer:
The statement is true; appliances need to have a minimum supply conductor ampacity and a maximum overcurrent protection rating for safe operation. These ratings, in amperes, along with safety devices like fuses and circuit breakers, prevent thermal hazards and protect users from electrical shocks.
Step-by-step explanation:
The statement “Appliances must be marked with the minimum supply conductor ampacity and maximum overcurrent protection” is true. Most electrical appliances are rated in amperes (or amps), which is the unit for electric current, with 1 ampere equivalent to 1 coulomb per second (1 A = 1 C/s). This rating ensures that the appliance can operate safely and efficiently within the limits of the electrical system. In addition to the current ratings of appliances, safety devices like fuses and circuit breakers are also rated in amperes. These protective devices are designed to interrupt excessive currents to prevent situations that could create thermal hazards. Moreover, the electrical system has several safeguards such as the three-wire system and a ground fault circuit interrupter (GFCI), which provide protection from both thermal overload and electrical shocks. Safety regulations typically limit continuous use to 80% of the breaker current capacity to prevent overloading.