Incumbents typically operate, test, install, repair and perform corrective and preventive maintenance on mechanical facilities equipment and systems including HVAC and plumbing systems; perform electrical maintenance and repair work including work on low voltage control systems; use computerized maintenance systems to ensure preventive maintenance program objectives are met; perform a wide range of facilities renovation, maintenance, and repair work; estimate costs of materials and labor; determine the priority for requisitioning materials and supplies; may perform welding to make repairs and fabricate and construct parts; may monitor contractor performance and work progress; respond to routine maintenance and service requests; and provide instruction and direction to unskilled and semi-skilled assistants. Minimum Qualifications: Knowledge: Work requires thorough knowledge of the methods, materials, equipment and tools used in one skilled trade area; working knowledge of materials, methods, equipment and tools in related trade areas pertaining to facilities, systems, construction and renovation; thorough knowledge of generally accepted trade practices in trade specialty; working knowledge of computerized maintenance and building automation systems; working knowledge of applicable building and safety codes and regulations related to facilities, systems and renovations.