An employer or user shall cause notices to be displayed within, and at all designated entrances to premises, as the case may be, where generating plant and transforming, switching or linking apparatus are situated, which notices shall -
(a) prohibit unauthorized persons from entering such premises;
(b) prohibit unauthorized persons from handling or interfering with electrical machinery;
(c) contain directions of procedure in case of fire; and
(d) contain directions on how to resuscitate persons suffering from the effects of electric shock:
Provided that this regulation shall not apply to miniature substations and distribution boxes, on condition that their access doors can be locked or bolted and that only authorized persons are permitted to open them and work thereon.