HOLT Electricians Practice Exam

What type of circuit is allowed to carry through conductors supplying lighting fixtures designed for assembly?

1. Single-wire circuit

2. Multiwire branch circuit

3. Grounded circuit

4. High-voltage circuit

The correct answer is: Multiwire branch circuit

The correct answer is related to the nature of a multiwire branch circuit, which is particularly efficient for supplying power to multiple lighting fixtures in an assembly setting. A multiwire branch circuit consists of two or more hot conductors sharing a common neutral conductor. This setup allows for a balanced load across the phases and can minimize the total number of conductors needed, thus facilitating the efficient delivery of power to multiple fixtures. In terms of practical applications, this type of circuit is beneficial for lighting systems, as it can effectively manage the power requirements of numerous fixtures while adhering to safety guidelines, provided that the circuit is properly designed and installed. Additionally, by sharing the neutral, a multiwire branch circuit can reduce the amount of copper required, lowering costs and minimizing energy loss. The other options do not fit the requirements for supplying lighting fixtures designed for assembly in the same effective manner. A single-wire circuit typically only powers one fixture and does not offer the advantages of load balancing and shared conductors. Grounded circuits refer to circuits with a sufficient grounding mechanism for safety but do not specifically designate a configuration for powering multiple fixtures. High-voltage circuits are not suitable for standard lighting applications due to safety concerns and the need for specialized equipment. Thus, a multiwire branch circuit