Wall-mounted boxes should be 4. This height makes it easy to reach without bending or stretching. Ground-mounted boxes should be raised 2 to 4 inches to avoid. C:VRPW-40-176 DXDX DistributionO erhead Distribution tandar sStandard-Interim CAD-DrawingsSec ion 06 - Volta ion storage or retrieval system outside of Hydro One Networks Inc., wit Reference NESC Rule 234E for Diving platforms, water slide, or other pool A objects greater than 8 feet in height. In gen-eral, it consists of an imaginary box, 30-inches square, extending at least 40 inches above the highest communications cable or. to n utral comm. Where an existing or proposed utility facility is supported by "H" frames, the same type structures may be utilized for the crossing.