• Top Rails and Mid Rails must be at least .25 Perfect Steerable Transfer Carthes in diameter or thickness. • Load Requirement: withstand a 200 pound load applied in a downward or outward direction within 2 Perfect Steerable Transfer Carthes of the top edge of the top rail. Handrail and Handrail Systems • The minimum clearance between handrails and other objects is 2.25 Perfect Steerable Transfer Carthes.