Service-entrance conductors must have an ampacity ___ the rating of the service disconnect.

• A. Less than
• B. Less than or equal to
• C. Greater than
• D. Greater than or equal to

Answer: (D)

The main idea is that service-entrance conductors must be sized to carry at least the current the service disconnect is rated for. The disconnect is the overcurrent protection for the service, so the conductors feeding it must be able to carry that maximum load safely without overheating. Therefore the ampacity must be greater than or equal to the service disconnect rating. Equality is allowed, so conductors rated exactly the same as the disconnect are acceptable.