What is a service disconnect and why must it be readily accessible?

• A. It's optional
• B. The main device that disconnects the building from the utility; it must be accessible for safety and emergency shutdown
• C. It provides standby power
• D. It is a measurement device

Answer: (B)

The service disconnect is the main device that isolates the building from the utility supply. It must be readily accessible so that power can be shut off quickly in an emergency or when performing safe, authorized work on the electrical system. Making this disconnect easy to reach ensures firefighters, occupants, and utility workers can de-energize the service without barriers or delays. It is not optional, not intended to provide standby power, and not a measurement device. The disconnect is typically a switch or large circuit breaker located at the service entrance, placed where it can be reached promptly and without special tools or keys.