When installing a ceiling fan, what safety measure is essential?

Disconnecting the power supply before installation is an essential safety measure when installing a ceiling fan. This step is critical to prevent electrical shocks and ensure the safety of both the installer and anyone else nearby while the installation process is taking place. By turning off the power at the circuit breaker, the risk of accidental electrocution is eliminated, allowing for a safer working environment and enabling the installer to work with the electrical components without the fear of live wires.

In contrast, while the other options may have their own significance—such as aesthetics or suitability for certain environments—they do not directly address the primary concern of electrical safety that is paramount during any wiring or installation involving electrical fixtures like ceiling fans.