An employer shall ensure at a construction site of a building and other construction work that,-
(a) no building worker lifts by hand or carries overhead or over his back or shoulders any material, articles, tool or appliances exceeding in weight the maximum limits set out in the following table:- Person. Maximum weight Load.
Adult-man 50kg Adult-woman 30kg Adolescent-male 30kg Adolescent-female 20kg unless aided by any other building worker or a mechanical device.
(b) no building worker aided by other building workers, lift by hand or carry overhead or over their backer shoulders, any material, article, tool or appliance exceeding in weight the sum total of maximum limits set out for each building worker separately under clause (a) , unless aided by a mechanical device.