Electrician's Licensing Practice Exam

Which NEC section outlines which air-conditioning systems require no grounding?

1. NEC 250.114

2. NEC 310.15

3. NEC 422.16

4. NEC 408.36

The correct answer is: NEC 250.114

The section of the National Electrical Code (NEC) that specifies which air-conditioning systems do not require grounding is NEC 250.114. This section details the types of equipment and appliances that are excluded from the grounding requirements due to their construction or design, specifically addressing air-conditioning units and similar systems. Understanding the role of grounding is crucial for electrical safety, as it helps prevent electric shock and ensures circuit protection. However, some appliances, including certain types of air-conditioning systems, have been deemed safe without the need for a grounding conductor based on their design features. NEC 250.114 provides clarity on these exceptions, ensuring that electricians can comply with safety standards while recognizing the distinct characteristics of various equipment. The other options pertain to different aspects of electrical installations. For instance, NEC 310.15 deals with ampacity and conductor ratings, NEC 422.16 outlines requirements for branch circuits serving appliances, and NEC 408.36 addresses the use of conductors within panelboards. Each of these sections serves specific purposes within the NEC framework, but they do not cover the requirements related to grounding for air-conditioning systems.