Technical information Crab range

Ledger Standard Diagonal brace Toeboard Stair string Step 7 6 1 0 s t a n d a r d s s i t e s t a i r c a s e , s t e e l f l i g h t s Basic standard Adjustable baseplate Panacier Compliant with standard NF P 12811-1 Load-bearing capacity compliant with standard NF P 93-522 type A ( personnel access and evacuation) 2.50 m 1.00 m 1.00 m 2.00 m Standards 10 standard site staircase, steel flights NF EN 12811-1 - Class B NFP 93-521 - Staircase NFP 93-522 - Type A Flight slope 30° to 55° 30° to 38° 39.3° Rise ≥ 175 mm, ≤ 225 mm Not specified 200 mm Tread ≥ 165 mm ≥ 125 mm ≥ 150 mm 230 mm Overlap - 25 ≤ a ≤ 55 mm Not specified - 15 mm Step width min. 500 mm 550 ≤ width < 750 mm ≤ 750 mm min. 566 mm Going ≥ 175 mm Not specified 245 mm Step size 2 x rise + going ≥ 540 mm, ≤ 660 mm 647 mm Non slip, self draining treads yes yes Headroom Free height ≥ 1.90 m > 2.25 m min. 2.50 m Horizontal guardrails Not specified Top rails, middle rail and toeboard compliant with current standard Top rail, middle rail and toeboard Working load 1 kN/m 2 2 kN/m 2 3 kN/m 2 3 kN/m 2 Handrail above floor > 950 mm 1000 mm Maximum gap between guardrails < 470 mm 452 mm Landing toeboard ≥ 150 mm 150 mm 01.11.17 T e c h n i c a l i n f o r m a t i o n