How far is the third-level distribution box from the ground

The third-level (tertiary) distribution box, or switch box, is typically installed at a height that allows safe access for operation and maintenance, generally around 1.5 to 2 meters (5–6.5 feet) from the ground.Installation Height GuidelinesFor a three-level distribution system:Tertiary distribution boxes (switch boxes) are installed to control individual electrical equipment, following the “one machine, one switch” principle .The recommended height from the ground is generally 1.5–2 meters, ensuring that personnel can safely operate and maintain the equipment without bending or overreaching .This height also aligns with NEC 110.26 headroom requirements, which specify a minimum of 2 meters (6 ft 6 in) of clearance above the floor for safe working space .Horizontal and Branching DistancesThe horizontal distance between a tertiary switch box and the electrical equipment it controls should preferably not exceed 3 meters to minimize voltage drop and improve safety .The distance between a secondary distribution board and tertiary switch boxes should not exceed 30 meters to maintain proper hierarchical distribution and reduce energy loss .Safety and Compliance ConsiderationsEnsure that each switch box is equipped with a leakage protector and that parameters are matched for sensitivity and reliability .Maintain clear working space around the box for inspection, maintenance, and emergency access, following NEC and OSHA guidelines .Avoid bypassing levels in the distribution hierarchy to preserve system integrity and safety . By following these height and distance guidelines, tertiary distribution boxes can be installed safely, efficiently, and in compliance with standard electrical codes.