206. General provisions.- The employer shall ensure at a construction site of a building or other construction work that- (a) every cofferdam and caisson is - (i) of good construction, sound material and of adequate strength; (ii) provided with adequate means for building workers to reach safely at the top of such cofferdam or caisson, as the case may be, in the event of an in rush of water; (iii) provided with safe means of access to every place where building workers are employed in such cofferdam and caisson, as the case may be; (b) the work relating to construction, positioning, modification or dismantling of cofferdams or caissons is carried out under the supervision of a responsible person; (c) all cofferdams and caissons are inspected by a responsible person at intervals as specified by the Chief Inspector of Inspections of Building and Construction, Delhi; (d) a building worker is allowed to work in a cofferdam or caisson after such cofferdam or caisson is inspected and found safe by responsible person within such preceding period as approved by the Chief Inspector of Inspections of Building and Construction, Delhi and a record of such inspection is maintained in a register; (e) the work in compressed air in a cofferdam or caisson is- (i) carried out in accordance with the procedure laid down in the relevant national standards; (ii) carried out by such building workers who have completed eighteen years of age and are medically examined as required under rule 223; (iii) carried out under the supervision of a responsible person; (f) if the work in cofferdam or caisson is carried out in shifts, a record of the time spent by each building worker in each such shift for carrying out the work is maintained in a register with particulars of time taken for the compression of such building worker, if any; (g) at every work site or project in a cofferdam or caisson, where building workers are employed to work in compressed air environment, a construction medical officer assisted by a nurse or trained first-aid attendant, is available at all times at such site or project during such work; (h) there is one stand by reserve compressor to meet the emergency at each work site or project in a cofferdam or caisson. | 
