What type of lamp holders are required for fixed lighting units on a 30 amp branch circuit?

For fixed lighting units on a 30 amp branch circuit, heavy-duty lamp holders are required due to the increased capacity of the circuit. A 30 amp circuit indicates a higher load capacity, which necessitates fixtures that can safely accommodate this load without failure or safety hazards. Heavy-duty lamp holders are designed with more robust materials and construction to handle higher wattages and prevent overheating or damage that could result from using standard or low-wattage holders. This requirement ensures that the electrical system remains safe and functional under the specified conditions, reducing the risk of electrical fires or equipment malfunctions. Standard lamp holders may not support the increased current, and choices like low wattage or LED would not be suitable as they do not correlate with the specifications needed for a high-capacity circuit.