Electrician's Licensing Practice Exam

In residential wiring, how many receptacles does the NEC allow on a standard 15-amp circuit?

1. 8 to 10 receptacles

2. 4 to 6 receptacles

3. 12 to 14 receptacles

4. No limit as per NEC

The correct answer is: 4 to 6 receptacles

The National Electrical Code (NEC) provides guidelines regarding the number of receptacles allowed on a standard 15-amp circuit for residential wiring. The code specifies that the maximum number of receptacles that can be connected to a 15-amp circuit is based on load calculations, where typically, each receptacle contributes to a load that should not exceed a certain threshold. In general, the NEC allows for a maximum of 8 to 10 receptacles on a standard 15-amp circuit under residential conditions. This recommendation is designed to prevent circuit overloads, helping to ensure safety and proper functioning of electrical systems. It also considers the potential for devices to draw current from the receptacles, which must remain within the capacity of the circuit. Thus, the correct interpretation recognizes that while there is a limit, it typically falls within the range of 4 to 6 receptacles under stricter considerations; however, 8 to 10 is commonly accepted due to practical loading conditions. By understanding these guidelines, electricians are better equipped to design residential electrical systems that conform to safety standards and prevent potential hazards such as tripping circuit breakers or overloading.