Hong Kong Regulations

ELECTRICITY SUPPLY REGULATIONS - REGULATION 5

Insulation test of low pressure and medium pressure mains

Every low pressure and medium pressure main, after having been placed in
position and before it is used for the purposes of supply, shall withstand a
pressure equal to the maximum pressure to which it is intended to be subjected
in use, and in any case at least 200 volts, and further, before being used as
aforesaid it shall be tested for insulation, and the company shall duly record
the results of the tests of each main or section of a main.