What is prohibited during public hours in a building undergoing minor renovations concerning propane cylinders?

Leaving propane cylinders unattended during public hours in a building undergoing minor renovations poses significant safety risks. Unattended cylinders can be subjected to unauthorized access, which increases the chance of accidents, such as leaks, fires, or explosions. It is essential for propane cylinders to be monitored closely to prevent these hazards and ensure that safety protocols are followed.

By keeping a watchful eye on the propane cylinders during active renovation periods when the public is present, personnel can quickly address any issues that arise, manage the cylinders properly, and ensure compliance with safety regulations. This practice helps in maintaining a safe environment for both the public and workers involved in the renovation.

In the context of the other options, while using multiple cylinders, storing them inside, or connecting to multiple devices might be governed by specific regulations, the primary concern during public hours is to ensure that the cylinders are securely managed to prevent unattended risks.