Why should an aerial apparatus be started with all electrical switches in the OFF position?

The correct answer focuses on the principle of starting an engine without a load. When an aerial apparatus is started with all electrical switches in the OFF position, it allows the engine to start up without being burdened by additional electrical loads. By doing this, you can achieve a smoother start, as the electrical system isn’t engaged—this ensures that the engine can achieve the necessary idle speed and proper oil circulation before any auxiliary systems draw power. This practice can help avoid unnecessary strain on the battery and starter motor, which is crucial for the longevity and reliability of the apparatus.

While considerations for safety and preventing accidental firings are important, the primary technical reasoning for starting without engaging electrical systems focuses on optimizing engine performance at startup, making it easier for the vehicle to function optimally from the outset.