Master Electrician Practice Exam

When an electrical service has a grounded conductor requirement, what minimum rated equipment must it include?

1. 800 amperes

2. 1000 amperes

3. 1200 amperes

4. 1500 amperes

The correct answer is: 1200 amperes

When an electrical service has a grounded conductor requirement, it must include equipment rated for a minimum of 1200 amperes. This specification is rooted in the National Electrical Code (NEC) standards, which outline the necessary requirements for electrical installations to ensure safety and reliability. A minimum rating of 1200 amperes allows for sufficient capacity to handle the electrical load safely while providing the necessary protection and grounding required by code. Equipment rated lower than this threshold may not provide the necessary safety measures or performance, especially as electrical loads increase. The choice of 1200 amperes reflects the understanding that modern electrical systems often require robust equipment due to higher power demands in residential, commercial, and industrial environments. It ensures that the installation can accommodate both current and future load requirements, facilitating adherence to safety standards and reducing the risk of equipment failure or electrical hazards.