HOLT Electricians Practice Exam

A three conductor No. 16 SJE cable has a maximum ampacity of how many amperes for each conductor?

1. 10 amperes

2. 13 amperes

3. 15 amperes

4. 20 amperes

The correct answer is: 13 amperes

The answer of 13 amperes reflects the ampacity guidelines for a three conductor No. 16 SJE (Service Entrance) cable, which is commonly used in low-voltage applications, particularly in residential and light commercial settings. Ampacity is influenced by several factors including the conductor size, insulation type, ambient temperature, and installation conditions. No. 16 gauge wire generally has a specific ampacity under typical conditions. According to the National Electrical Code (NEC) and manufacturer specifications, a No. 16 wire, with appropriate insulation, can typically handle around 13 amperes. This value ensures that the wire operates safely without overheating during normal use. Understanding the correct ampacity is crucial for ensuring safe electrical installations, preventing overheating, and meeting local electrical codes. This is especially important in applications such as lighting circuits, small appliance circuits, or low-voltage systems, where overloading can lead to insulation breakdown and increase the risk of fire hazards. Therefore, knowing that 13 amperes is the appropriate maximum is essential for electricians when selecting wiring for specific applications.