If you have to work at height and there is a risk of falling, you MUST The law applies fall protection equipment. Fall protection equipment must be inspected by trained personnel at least once a year. Typical causes of fall accidents are insufficient knowledge of and insufficient training in the use of the equipment.
The load on the body must never exceed 6 kN, and if you use the correct fall protection equipment this will not happen either. Remember the required clearance when working with fall arresters (2 x line length + brake length + 1 mtr. safety buffer)
Watch out for pendulum swings in connection with falls, never go more than 30 degrees from your anchor point.