183. Erection or dismantling of steel and pre-fabricated structure.- The employer shall ensure at a construction site of a building or other construction work that - (a) the safety of building workers employed for the erection or dismantling of steel structures and pre-fabricated structures is ensured from danger by using appropriate means such as the following, namely;- (i) ladders, gangways or fixed platforms; (ii) platforms, buckets, boatswain's chair or other appropriate means suspended from lifting appliances; (iii) safety harness, life lines, catch nets or catch platform; (iv) power-operated mobile working platforms; (b) the work of erection or dismantling of buildings or structures or form work or false work or shoring or any other civil engineering work is carried out by trained building workers under the supervision of a person responsible for such work; (c) steel or prefabricated structures are so designed and made that such structures can be safely transported or erected; and weight of each unit of such structures is clearly marked on such unit; (d) the design of each such part maintains stability of each part of the structures referred to in clause (a), clause (b) and clause (c), when erected, and to prevent danger, the design shall explicitly take into account- (i) the relevant conditions and methods of attachment in the operations of stripping, transport, storing and temporary support during erection of such parts; and (ii) safeguards, such as provision of railings with working platforms, and for mounting such railings and platforms easily on the structural steel or prefabricated parts. (e) the hooks and other devices built in or provided on the structural steel or prefabricated parts that are required for lifting and transporting such parts are so shaped, dimensioned and positioned to withstand the stresses to which such hooks or other devices are subjected; (f) prefabricated parts made of concrete are not stripped or erected before such concrete has set and hardened sufficiently to the extent provided for in the plans, and such parts are examined by the responsible person for any sign of damage before their use; (g) store places are so constructed that- (i) there is no risk of structural steel or prefabricated parts falling or overturning; (ii) storage conditions generally ensure stability and avoid damage having regard to the method of storage and atmospheric conditions; and (iii) racks are set on firm ground and designed so that units cannot move accidentally in such store places; (h) structural steel or pre-fabricated parts are not subjected to stresses prejudicial to their stability while they are stored or transported or raised or set down; (i) tongs, clamps and other appliances for lifting structural steel and prefabricated parts are- (a) in such shape and dimensions as to ensure a secure grip without damaging such parts; and (b) marked with the maximum permissible load in the most unfavourable lifting conditions; (j) structural steel or pre-fabricated parts are lifted by such methods and appliances that prevent them from spinning accidentally; (k) structural steel or pre-fabricated parts are provided with railings and working platforms before raising such parts to prevent any danger of falling of building workers , materials or articles at the time of any work with such parts; (l) all reasonably practical measures are taken to avoid injury to building workers, building structure or equipment while structural steel or pre-fabricated parts are handled or stored or transported or raised or lowered; (m) structures are not worked on during violent storms or high winds or any other such hazardous situation; (n) the risk of falling to which building workers, moving on high or sloping girders, may be exposed is limited by all means of adequate collective protection or by the use of a safety harness which is well secured to a sufficiently strong support; (o) structural steel parts which are to be erected at a great height are, as far as practicable, assembled on the ground; (p) when structural steel or pre-fabricated parts are being erected, a sufficiently extended area underneath the workplace shall be barricaded or guarded; (q) steel trusses which are being erected are adequately shored, braced or guyed until they are permanently secured in position; (r) structural members are not forced into place by the hoisting machine while any building worker is in such a position that he is likely to be injured by such operation; | 
