Environment: Works outside and inside, inside truck/van and inside kitchens; works on slippery or uneven walking surfaces, frequent exposure to extreme hot and cold temperatures; works around machinery with moving parts; may work in tight or enclosed spaces; may work alone; exposure to heat from appliances and possible exposure to caustic chemicals; frequent reaching and feeling while in confined spaces and around objects, which reduce or prevent visibility of what is being touched; occasionally works at heights up to 50 above ground; may require occasional irregular and/or prolonged hours; frequent districtwide travel. Lays out, assembles, installs, tests, maintains, services, and repairs items such as conduits, meters, panels, control boards, lights, fans, heaters, bell systems, field lighting systems, clock systems, and wall, floor, and ceiling receptacles, and underground wiring.