The employer shall ensure at a construction site of a building or other construction work that-
(a) reliable and effective means of communication such as telephone or walkie-talkie are provided and are maintained in working order for arranging better and effective communication at an excavation or tunnelling work at the following locations, namely, -
(i) working chamber at the face of an excavation ;
(ii) intervals of hundred metres along the tunnel;
(iii) working chamber side of a man-lock near the door of such man-lock;
(iv) interior of each chamber of a man-lock;
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(v) location conspicuous a lock attendant's station;
(vi) a compressor plant;
(vii) a first-aid station; and
(viii) outside the portal or the top of a shaft;
(b) such number of bells and whistles are made available at all times at the locations referred to in sub-clause (i) to sub-clause (viii) of clause (a) as are necessary for the safety of persons at such locations.