Enough space should be allowed so that personnel can perform all required tasks.
Additional Information:
The space should accommodate kneeling and bending, simultaneous work by more than one person, and simultaneous performance of operational and maintenance tasks as required. Recommended minimum separations are illustrated in Figure 12.2. A minimum separation of 50 inches is recommended between a single row of equipment/panel and a wall or other opposing surface. A minimum separation of 50 inches is also recommended between two rows of facing equipment if both rows are worked by a single person. A minimum separation of 8 feet is recommended between opposing rows of equipment where more than one person must work simultaneously on operational or maintenance tasks, and kneeling, bending, or use of test equipment may be necessary.
Figure 12.1 Spacing of equipment to accommodate seated users.