Journeyman Electrician Practice Exam 2025 - Free Electrician Practice Questions and Study Guide

The maximum allowable rung spacing for 1/0 AWG through 4/0 AWG cables in a ladder-type cable tray is 9 inches. This spacing is established to ensure proper support and protection for the cables, preventing sagging and providing a stable arrangement that minimizes the risk of damage to the insulation and overall integrity of the cables. Maintaining this spacing helps with ventilation and heat dissipation as well, which is crucial for the safe operation of electrical systems. By adhering to the 9-inch requirement, installers can ensure compliance with safety standards and best practices in cable management.