GB 50016-2014 (2018年版) 第10.1.8条
| Fire-protection power supply circuits shall meet the requirement for continuous power supply during a fire. Where installed exposed (including within suspended ceilings), they shall be protected by metal conduits or enclosed metal trunking, and fire-protection measures shall be taken; where installed concealed, they shall be run in conduits embedded in non-combustible structures with a cover thickness of not less than 30 mm.