Service Boxes provide access to which cables and are generally solid.

• A. Primary cables only and are generally vented.
• B. Secondary cables only and are generally solid.
• C. Both primary and secondary cables.
• D. Underground service lines and are generally flexible.

Answer: (B)

Service boxes are the access point for the building’s secondary service conductors—the lower‑voltage wires that come from the transformer to the service equipment. They are built as solid, weather-tight enclosures so you can open them for splices or terminations while keeping out moisture and debris in outdoor conditions. Primary cables, which are higher voltage and run to the transformer, aren’t accessed in these boxes. Likewise, underground service lines and any option implying flexible conductors aren’t the purpose of these boxes. In short, service boxes provide access to secondary cables only and are generally solid.