Generally, yes, you need to wear fall protection in a scissor lift on an OSHA site. OSHA requires that workers on scissor lifts use a travel restraint system consisting of a full body harness and lanyard [1] connected to an anchor point specified by the manufacturer [1].

However, there are exceptions [1]:

• If the manufacturer's specifications allow work from the scissor lift using only its guardrails for fall protection, and
• The scissor lift is operating on a firm, substantially level surface.

Even if the above exceptions are met, if a worker's movement cannot be adequately restricted by the travel restraint system, the employer must ensure the worker uses a personal fall arrest system [1].