The Electrical and Mechanical Services Department (EMSD; Chinese: 機電工程署) is a Hong Kong government department responsible for inspection and enforcement of operation and safety of many electricity and gas installations; railways and trams; lifts and escalators; amusement rides; working platforms on building sites, and many other diverse areas. The department has two main branches: Regulatory Services and Trading Services. The department falls under the purview of the Development Bureau. The incumbent Director of Electrical and Mechanical Services is Pang Yiu-hung. The two deputy directors are H. C. Lai and T. H. Tai.