Oklahoma Electrical Practice Exam

Branch circuits supplying inductive lighting loads are calculated based on what criteria?

1. Manufacturer recommendations

2. Total ampere rating of the units

3. Voltage of the circuit

4. Length of the circuit

The correct answer is: Total ampere rating of the units

When calculating branch circuits supplying inductive lighting loads, the total ampere rating of the units is crucial because it reflects the amount of current that the circuit must safely handle. Inductive loads, such as certain types of lighting that use ballasts or transformers, can have different current demands compared to purely resistive loads. By accounting for the total ampere rating, electricians can ensure that the circuit is adequately sized, preventing overheating, excessive voltage drop, and potential failure of circuit components. Proper calculations based on the total amperage help maintain system efficiency and longevity. In contrast, manufacturer recommendations can provide valuable guidelines but may not cover all specific code requirements or real-world variables. While the voltage of the circuit is important for determining compatibility with devices, it doesn't directly influence the calculation of the circuit rating based on load demand. The length of the circuit can affect voltage drop considerations, but it is not the primary criteria for determining the overall sizing based on the load's current capacity.