请问电线挨着forced air的暖气管道危险吗？

[xxn]

家里老房子装修，要在ceiling上安装很多吸顶灯，我看师傅很多电线是几乎挨着暖气管道的，就是forced air的那种长长的方形的看起来是金属的暖气管道是在房间顶上的。我有点担心冬天开暖气那个管道会很热，电线挨着不安全，但是师傅说那个管道就是送暖风，不会很烫没关系，是不是这样呢？

[MMDGG]

according to the CEC rules, it seems it needs to be 25mm of AIR SPACE, insulation isn't "air space"..
CEC 21st edition 2009
12-506
(4) Where non-metallic-sheathed cable is run in proximity to heating sources, transfer of heat to the cable shallbe minimized by means of an air space of at least
(a) 25 mm between the conductor and heating ducts and piping;

5) Notwithstanding subrule 4, a thermal barrier comforming to the requirements of the National Building Code of Canada or local building legislation shall be permitting to be installed between the conductor and the heating sources to maintain ambient temperature of the conductor at not more than 30C.
6) Two conductor cable shall not be stapled on edge.

''loomex cable to be kept at least 25mmm [1''] away from all heating ducts and hot water pipes, a chunk of building insulation may be placed between the cable and the duct''