Therefore, the thickness of the sheet metal of the cabinet body of the power electrical distribution box is usually not less than 1. 0mm or thicker, may be. This UFC supersedes UFC 3-520-01, dated 06 October 2015. The Unified Facilities Criteria (UFC) system is prescribed by MIL-STD 3007 and provides planning, design, construction, sustainment, restoration, and modernization criteria, and applies to the Military Departments, the Defense Agencies, and. The criteria for selecting the thickness of the sheet metal for the electrical distribution box cabinet are mainly based on the following aspects: ### Type and Purpose of the Electrical Distribution Box - **Lighting electrical distribution box**: It is usually used to control and distribute the. required. Isolator Base should withstand the breaking capacity of 80 kA. To extinguish the arc immediately in iso ators, in each phase arc-chutes with minimum 12 strips ype. The PDU is sized to handle the load that the two. Appendix A added references to IEEE Guides mitigating bird and wildlife-related power interruptions. A distribution box, also known as a distribution board, panel board, breaker panel, or electric panel, ensures that electrical power is distributed throughout the facility. It is a building's or property's core electrical.