When multiple sets of conductors are used in flexible conduit, which of the following regulations typically applies?

The regulation that states that conductor size must be consistent across all conduits is rooted in ensuring electrical safety and preventing issues related to load balancing and overheating. When multiple sets of conductors are used in a single flexible conduit, it's crucial to maintain a uniform size across all conductors to ensure that each wire can safely carry its intended current. This consistency helps in achieving proper performance of the circuit and minimizing electrical resistance, which can lead to overheating if wires of varying sizes are used.

Moreover, using conductors of different sizes can create imbalances in the electrical system, potentially leading to increased wear and tear on equipment, voltage drop issues, and complications during troubleshooting or maintenance. Regulatory bodies emphasize this consistency to ensure both compliance with electrical codes and the safety performance of electrical systems.

In contrast, suggestions that allow variations in conductor sizes do not align with best practices for electrical design and safety, making them less favorable in this context.