How many switches or circuit breakers can a service disconnecting mean consist of according to NEC Section 230.90(A), Exception No.3?

The correct choice indicates that a service disconnecting means may consist of between two to six switches or circuit breakers according to NEC Section 230.90(A), Exception No. 3. This exception allows for the grouping of multiple disconnects in certain applications, acknowledging the practicality of having multiple disconnecting devices for larger service installations.

By permitting two to six disconnecting means, the NEC recognizes the need for flexibility in the design and operation of electrical systems while ensuring safety and accessibility. This range allows electricians to create systems that can effectively manage the load while adhering to the safety codes and requirements set forth in the NEC.

This information is critical for understanding both the requirements for electrical systems and the limitations of how many devices can be clustered within a service disconnect. Understanding this aspect helps in the proper design and installation of electrical systems, ensuring that they are not only compliant with standards but also functionally effective.