What is the maximum distance apart that service entrance cables must be supported when maintained in contact with a building?

The correct answer indicates that service entrance cables must be supported at a maximum distance of 15 feet apart when they are maintained in contact with a building. This requirement is outlined in the National Electrical Code (NEC) to ensure safety and reliability of electrical installations. Proper support of service entrance cables helps prevent damage due to sagging or movement that can arise from environmental factors such as wind, ice, or vibration.

Maintaining a distance of 15 feet between supports allows for effective management of these forces while providing the necessary access for maintenance and inspection. Additionally, this guideline is critical for preventing strain on the connections and ensuring that electrical systems are both safe and efficient. Proper adherence to these distances also helps minimize the risk of electrical hazards such as shorts or breaks in the insulation, promoting overall safety for both people and property.

This dimension reflects industry standards established to enhance the integrity of electrical systems and is vital for compliance with the NEC.