An employer shall ensure that -
(a) precautions are taken, either by -
(i) earthing and automatic disconnection of the supply of electricity, or
(ii) other suitable means,
to prevent danger arising where any exposed conductive part may become live, and
(b) all electrical circuits supplying -
(i) electric water heating devices,
(ii) electrically heated showers, and
(iii) pumps for electrically operated showers,
which are located in zone (1), as defined by the Electro-Technical Council of Ireland 'National Rules for Electrical Installations', of rooms in a place of work containing a bath or shower basin, are protected by a residual current device having a tripping current not exceeding 30 milliamperes operating within such period of time so as to provide the necessary protection to prevent danger to any person coming into direct or indirect contact with any live part of the circuit.