The employer shall ensure at a construction site of a building or other construction work that,—
(a) barricades and warning signs are erected along with every side throughout the length and breadth of a building or other construction work to be demolished to prevent unauthorised persons from entering into the site of such building or other construction work during demolition operations;
(b) during the demolition of an exterior masonry wall or a roof from a point more than twelve metres above the adjoining ground level of such a wall or roof, if persons below such wall or roof are exposed to falling objects, suitable and safe catch platforms shall be provided and maintained at a level, not more than four metres below the working level except where an exterior built-up scaffold is provided for safe and adequate protection of such persons; and
(c) suitable and standard warning signs in accordance with national standards are displayed or erected at conspicuous places or positions at the workplace.