A minimum of 24 inches of cover for secondary (0 − 750 V) electric service, or 30 inches minimum cover for primary (over 750 V) is required for electric trench only. Know OSHA's power line clearance requirements for construction and crane work, what to do when they can't be met, and the penalties at stake. Both of these voltages are considered when calculating the required separation distances. ping a minimum safe distance from power lines is critical. 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. Follow the guidelines below if you're building a home, business, or other structure near pad-mounted electrical equipment. If you're building a structure near an overhead powerline, call Idaho Power at 208-388-2323 to discuss clearance requirements. Employers and contractors have responsibilities under the Alberta Occup tional Health and Safety (Alberta OHS) Act, Code, and Regulation. When there is a conflict between this document and reliance placed on this information is.