Final answer:
Emergency power systems are typically required by building codes to ensure the operation of critical functions during a power outage. Standby power systems may be required for additional systems, and transformers along with circuit breakers play a crucial role in maintaining electrical safety.
Step-by-step explanation:
Within the context of building codes and safety requirements, emergency and standby power systems are essential components to ensure the continuous operation of critical functions. These systems differ in that emergency power systems are designed to provide immediate power in the event of a main power failure, while standby power systems may provide power for less critical functions and may not be activated as quickly.
In many building codes, it is a requirement to have an emergency power system installed. This is to ensure that essential systems such as lighting, fire alarms, and ventilation can continue to operate in the occurrence of a power outage. Standby power systems might be required for certain additional comforts or systems that are not deemed critical.
Key devices in these systems, such as transformers and circuit breakers, are employed to uphold electrical safety by preventing thermal and shock hazards. Not only do transformers distribute power effectively, but safety devices like circuit breakers help in preventing excessive currents that could cause thermal hazards.