Where rear access is required for enclosed equipment, what is the minimum working space required horizontally?

The minimum horizontal working space required for enclosed equipment with rear access is 30 inches. This requirement is in place to ensure that technicians and electricians have adequate space to perform maintenance, troubleshooting, or any necessary adjustments safely and effectively. A working space of this size allows for the comfortable movement of tools and body, reducing the risk of injury and ensuring that tasks can be completed with efficiency.

Standards, such as those outlined in the National Electrical Code (NEC), emphasize the necessity of having sufficient clearance and workspace around electrical equipment. This clearance is particularly critical in areas that may require regular access, as it facilitates ease of operation and minimizes hazards associated with working in tight spaces.

The option indicating a different measurement may not account for the practical considerations in many scenarios where equipment operation or service might occur, leading to inadequate space for technicians. Therefore, 30 inches has been established as a reliable standard to ensure safety and accessibility.