Which Service Boxes statement is correct?

• A. They provide access to primary cables only.
• B. They provide access to secondary cables only and are generally solid.
• C. They are vented.
• D. They are used to measure power quality.

Answer: (B)

Service Boxes are enclosures that give access to the cables that run to customers, which are the secondary, low-voltage conductors. They’re designed to provide a safe point to work on or inspect those secondary cables, not the higher-voltage primary feeders. The “generally solid” part means these boxes are not vented, helping protect the interior and keep moisture out. They’re not intended for measuring power quality—that requires specialized equipment and test points. So the statement that they provide access to secondary cables only and are generally solid is the correct description.