Electrician's Licensing Practice Exam

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How many disconnects are allowed per service entrance according to NEC?

Three
Four
Six
Eight

The correct answer is: Six

The correct answer is based on the National Electrical Code (NEC) requirements for service disconnects. The NEC allows for a maximum of six service disconnects to be installed at a service entrance for a single structure. This permits multiple disconnects to be grouped and still maintain effective control over the power supply to the building. Having no more than six disconnects helps ensure that in the event of an emergency, a qualified individual can quickly and safely shut off all power to the service without excessive searching through multiple disconnects. This limit also simplifies the organization of electrical systems and reduces potential confusion during maintenance or emergency situations. There are conditions under which this number can differ, such as if the service is made up of multiple feeders or if it involves load calculations for certain types of installations. However, the general rule of six provides a clear and manageable guideline for standard installations.