Hong Kong Regulations

FACTORIES AND INDUSTRIAL UNDERTAKINGS (ELECTRICITY) REGULATIONS - REGULATION 30

Safe access to underground substations

(1) Subject to paragraph (2), every underground substation not otherwise
easily or readily accessible shall be provided with adequate means of access
by a door or trap door with a staircase or ladder securely fixed and so placed
so that no person can make accidental contact with any live part of any
switchboard or any bare conductor therein.

(2) Where an underground substation-

   (a)  has persons employed therein otherwise than for inspection or
        cleaning; or

   (b)  is not of ample dimensions and contains machinery driven by electric
        motors or apparatus utilizing high voltage, then access shall be
        provided by means of a doorway and a staircase.