What should the grade, floor, or platform in required working spaces be?

The grade, floor, or platform in required working spaces must be "level and flat" to ensure the safety and effectiveness of electrical work. An even surface minimizes the risk of accidents and allows personnel to effectively access and operate equipment without the hazard of tripping or losing balance. A level and flat surface also allows for proper installation and maintenance of electrical components, helping to prevent damage to both the equipment and the personnel working on them.

This requirement supports the principle of creating safe and unobstructed work environments, which is in line with the NEC's emphasis on safety in electrical installations. An inclined surface would create stability issues and increase the risk of falls, while a rugged surface may present unevenness that could hinder mobility and safety. Thus, maintaining a level and flat working area is essential for compliance with safety standards and improving the overall efficiency of electrical work.