ICC Residential Electrical Inspectors Practice Exam

What is the minimum size circuit conductor allowed to be connected in parallel?

1. 2 AWG

2. 1/0 AWG

3. 4 AWG

4. 6 AWG

The correct answer is: 1/0 AWG

The minimum size circuit conductor allowed to be connected in parallel is 1/0 AWG. In electrical installations, connecting conductors in parallel is typically done to increase the current-carrying capacity of the circuit. However, there are specific guidelines set forth in the National Electrical Code (NEC) regarding the sizes of conductors when they are installed in parallel configurations. The code stipulates that when conductors are paralleled, they must be of the same size and material to ensure equal current distribution among them. Importantly, this means that there is a minimum size requirement for the conductors used in such an application. The requirements are designed to prevent overheating and ensure safety and efficiency in the electrical system. 1/0 AWG is the smallest allowed size for conductors when installed in parallel, which reflects a proper compromise between conductor material limits and practical safety considerations. Conductors smaller than 1/0 AWG may not be reliable enough in parallel configurations due to increased resistance and potential for overheating. This understanding stems from both code guidelines and practical experiences in electrical engineering and safety. In contrast, other sizes like 2 AWG, 4 AWG, and 6 AWG do not meet the minimum requirement set by the NEC for