Section 136(a) in The Building And Other Construction Workers '(Regulation Of Employment And Conditions Of Service) Central Rules, 1998
(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 fact 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;(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.
