What is the minimum width of working space at a service panel?

The minimum width of working space at a service panel is 30 inches. This requirement is established to ensure that electricians and service personnel have adequate space to operate safely and efficiently while accessing the panel. A 30-inch width allows for sufficient clearance to work comfortably and securely, reducing the risk of accidents or injuries while handling electrical components.

This space requirement is also consistent with the need for maintaining proper access to the service panel for emergency situations and routine maintenance. Adequate working space not only enhances safety but also complies with the National Electrical Code (NEC), which outlines these dimensions to standardize working conditions across differing installations.

The other choices may suggest wider spaces, but the code specifically identifies 30 inches as the minimum necessary width, allowing enough room to operate tools, read instruments, and conduct necessary tasks without encroaching on the safety zone around the electrical panel.