维护和维修错综复杂的电气和电子电路。需要注册或许可。 Services and repairs intricate and complex electrical and electronic circuitry. Registration or licensing is required.

安装，测试，连接，委托，维护和修改电气设备，接线和控制系统。需要注册或许可。 Installs, tests, connects, commissions, maintains and modifies electrical equipment, wiring and control systems. Registration or licensing is required.

设计、安装、维护、保养和维修电动和液压客运和货运电梯、自动扶梯、自动人行道和其他电梯设备。需要注册或许可。 Designs, installs, maintains, services and repairs electric and hydraulic passenger and freight lifts, escalators, moving walkways and other lift equipment. Registration or licensing is required.

组装、安装、维护和维修，工业、商业和家庭空调和制冷系统和设备。Assembles, installs, maintains and repairs industrial, commercial and domestic airconditioning and refrigeration systems and equipment. Registration or licensing may be required.