Primary AC power supplied by the commercial limited power or an approved alternate energy source should be taken from a/n?

The primary AC power supplied by the commercial limited power or an approved alternate energy source should be taken from a non-switched portion of a branch circuit. This is important because a non-switched portion ensures that power remains continuously available, which is critical for systems that require a stable and uninterrupted power supply to function effectively.

Using a non-switched portion avoids the risk of inadvertently interrupting power during operation, ensuring that any devices or systems reliant on this power source remain operational even if other parts of the circuit are turned off. For applications where reliability and constant power are paramount, this choice prevents any accidental shutdowns that could lead to system failures or safety hazards.

In contrast, taking power from a switched portion of a branch circuit could lead to interruptions in power supply whenever the switch is operated, which is undesirable. Similarly, while a backup generator is an alternative power source, it does not serve as the primary AC power source unless the main source fails. Finally, a dedicated circuit is useful for specific devices but the phrasing of the question highlights the importance of the seamless provision of power, which is best accomplished through a non-switched section.