A worker strapped into a harness and secured by a lanyard to a roof anchor looks safe. But the difference between falling off the roof or not – and providing level three controls under the fall prevention hierarchy – comes down to subtle differences in the design and use of the equipment. Here, safe work at heights specialist, Carl Sachs of Workplace Access & Safety in Australia explains why the distinction between level three fall restraint and level four fall arrest systems is important and how workplace controllers can be sure systems are designed for safety and compliance.

The...