Home Inspection Electrical Practice Test

What must match to ensure the voltage and capacity are the same?

1. The rating of the main panel and the size of the main disconnect breaker

2. The capacity of individual circuits in the house

3. The amperage ratings of appliances

4. The installation of GFCI outlets

The correct answer is: The rating of the main panel and the size of the main disconnect breaker

Ensuring that the rating of the main panel matches the size of the main disconnect breaker is crucial for the safe and effective operation of an electrical system. The main panel serves as the central distribution point for electrical circuits in a building, while the main disconnect breaker acts as the protective device that controls the overall flow of electricity and protects the panel and circuits from overload. If the rating of the main panel and the size of the main disconnect breaker are mismatched, it could lead to several issues. For instance, if the disconnect breaker is rated too low compared to the main panel's capacity, it might trip frequently under normal load conditions, which can be inconvenient and potentially unsafe. Conversely, if the disconnect breaker is rated too high, it may not trip in a fault condition, allowing excessive current to flow through the system and risking damage to equipment, overheating, or even fire hazards. Thus, ensuring that these two components match in terms of voltage and capacity is vital for maintaining a safe electrical system. The other options focus on different aspects of electrical safety and functionality but do not address the foundational requirement of matching the main panel and disconnect breaker ratings.