NEC Commercial Electrical Practice Test

What is the maximum rating of a branch circuit for a flat cable assembly installed in a surface metal raceway?

1. 20 amp

2. 30 amp

3. 40 amp

4. 50 amp

The correct answer is: 30 amp

The maximum rating of a branch circuit for a flat cable assembly installed in a surface metal raceway is determined by the National Electrical Code (NEC), which provides guidelines to ensure electrical installations are safe and reliable. For flat cable assemblies, specifically, the NEC dictates that a branch circuit should not exceed a certain amperage when housed within surface metal raceways to avoid potential overheating and other safety hazards. In this context, a 30 amp rating allows for adequate capacity for the circuit, balancing the load it can handle while still conforming to safety codes. This capacity is sufficient for many applications where surface metal raceways are used, ensuring that the circuit can accommodate common electrical loads without exceeding safety limits. Understanding the maximum rating is essential for electricians and electrical engineers when designing circuits and selecting components, to ensure compliance with the NEC and to maintain safety within electrical installations.