Access working above ground

The term ladder is generally taken to include stepladders and trestles. The use of ladders for working above ground level is only acceptable for access and work of short duration (Work at Height Regulations 2005). 

Generally, it is more economical to prevent explosive atmospheres ia rooms than to try to provide explosion-proof electrical equipment. Personnel should never be allowed to work ia a ha2ardous atmosphere. Where such an atmosphere cannot be avoided through control of flammable Hquids, gases, and dusts, access to the area iavolved should be limited and the area segregated by hoods or special ventilation. Electrical equipment on open, outdoor stmctures more than 8 m above-ground usually is considered free from exposure to more than temporary, local explosive mixtures near leaks (86). 

Vertical drains are normally installed when very soft to soft subsoil conditions are encountered at the reclamation site. If such a material is present at ground surface (above the water table) then it is recommended to first install a fill layer of minimum 1 to 2 m thickness in order to allow access for the drain installation equipment. The stability of the equipment used for the installation of the drains shall be checked before the start of the works in order to avoid accidents. 

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