213 ACCESS STAIRCASES- TECHNICAL INFORMATION - 2023 STAIRCASES 4-STANDARD CRABESCAL WORKSITE ACCESS TOWER WITH ALUMINIUM FLIGHT Comparison NF EN 12 811- 1 Class B NF P93- 521 Step ladder CRABESCAL access tower 4-standard aluminium flight Angle of flight 30° to 55° 45° to 50° 48° Rise 175 ≤ h ≤ 225 mm - 182 mm Tread ≥ 165 mm ≥ 125 mm 180 mm Overlap -25 ≤ a ≤ 55 mm - -15 ≤ a ≤ 55 mm Step width 500 mm min. 550 mm ≤ width < 750 mm 585 mm Step run ≥ 175 mm - 180 mm Step size (Blondel) 540 ≤ 2h + g ≤ 660 mm 544 mm Non slip, self draining steps yes yes Headroom ≥ 1.90 m > 2.25 m 4.00 m Lateral protection - rail, midrail and toe board rail, midrail and toe board Working load 100 daN/m² 200 daN/m² 200 daN/m² Rail/deck distance > 950 mm 1,000 mm Max. opening in the lateral protection < 470 mm 452 mm Toe board height ≥ 150 mm 150 mm 1.50 m 2.50 m
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