Section 136(a) in The Delhi Building And Other Construction Workers (Regulation Of Employment And Conditions Of Service) Rules, 2002
(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 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 lock attendant's station;(vi)a compressor plant;(vii)a first-aid station; and(viii)outside the portal or the top of a shaft;
