Which installation method is required for batteries according to ABYC E-10?

The correct answer emphasizes that battery installations must adhere to the guidelines set forth in ABYC E-10, which focus on ensuring safety and functionality. The term "installations" indicates a broader concept that encompasses all necessary aspects of properly integrating batteries into a vessel's electrical system.

ABYC E-10 outlines specific requirements regarding how batteries should be mounted, secured, and connected to prevent hazards such as short circuits, leaks, or potential fire hazards. This includes factors like ventilation, isolation from potential sources of explosive gases, and protection from physical damage. By prioritizing the "installations" method, the standard ensures that all considerations for safety and accessibility are addressed, which benefits the overall integrity of the electrical system onboard.

The other options, while they may describe specific types of configurations for battery placement, do not capture the comprehensive nature of the requirements described in ABYC E-10. Focusing solely on "built-in," "removable," or "external" does not encompass the full scope of installation practices necessary for compliance with safety standards.