What is the maximum unsupported length of cable allowed for connection to batteries?

The maximum unsupported length of cable allowed for connection to batteries is determined by safety and performance considerations. In this scenario, the correct choice signifies that a length of 36 inches is the limit for unsupported cable runs. This length helps to ensure that the cable does not sag excessively or become prone to damage from vibrations, environmental factors, or accidental contact with other objects.

Maintaining this length also contributes to minimizing voltage drop, which can occur as the cable runs further from the battery. When the cable length exceeds this specified limit, it can lead to inefficient performance or potential safety hazards, such as overheating or short-circuiting. Properly adhering to this guideline ensures that the integrity of the electrical system is maintained, promoting reliable operation and reducing risks associated with electrical installations on boats or other marine applications.