Final answer:
Small appliances recovery equipment manufactured after November 15, 1993 must be capable of recovering refrigerants according to EPA guidelines, while electrical appliances are limited to 80% of breaker capacity for safety reasons.
Step-by-step explanation:
Small appliances recovery equipment manufactured on or after Nov 15, 1993, must be capable of recovering refrigerants to the required levels set by the EPA's Clean Air Act. The certification standards were put in place to minimize the release of harmful substances that can deplete the ozone layer or contribute to climate change. Refrigerant recovery machines must meet strict recovery efficiency rates, and professionals handling these substances must be certified to ensure proper recovery, recycling, or disposal of refrigerants.
Safety regulations limit continuous use of electrical appliances to 80% of the breaker current capacity to prevent overloading circuits and reduce the risk of fire. For 15-amp and 20-amp breakers, the realistic limits are 1,400 W and 1,920 W respectively, which is why most heating appliances, such as those shown in Figure 5.2, do not exceed 1,500 W for circuit and safety reasons.