工程证明书 meaning in English

technical reference

Electrical work means the work in relation to the installation , commissioning , inspection , testing , maintenance , modification or repair of a low voltage or high voltage fixed electrical installation and includes the supervision and certification of the work and the design of the installation
电力工程是指与低压或高压固定电力装置的安装、校验、检查、测试、维修、改装或修理有关的工程或工作，包括监督工程和签发工程证明书，以及签发电力装置设计证明书。