Hong Kong Regulations

ELECTRICITY SUPPLY REGULATIONS - REGULATION 8

Circuit-breaker for high pressure mains, etc.

Every high pressure main, conductor or other apparatus shall be protected by a
suitable fuse or automatic circuit-breaker: Provided that it shall not be
incumbent upon the company to provide such a fuse or circuit-breaker for the
outer conductor of a concentric main which is, in accordance with these
regulations or with the approval of the Director of Electrical and Mechanical
Services, efficiently connected with  earth. (L.N. 76 of 1982; L.N. 298 of
1982)