They are not required unless a risk assessments determines a risk of falling. Operators are protected from falls by the guard and hand rails. Unless they do something like in the above picture. But these guys need more than a harness to keep them safe. Other possible hazards with wearing a harness in a scissor lift are giving people a false sense of security and more risk taking behaviour. And if you do fall out, being swung into the side of the machine causing injury.
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