ACCESS STAIRCASES - TECHNICAL INFORMATION - 2023 212 TECHNICAL DATA 10-STANDARD CRABESCAL SITE STAIRCASE WITH STEEL FLIGHTS Comparison NF EN 12 811- 1 Class B NF P93- 521 NF P93- 522 Type A Crabescal WORKSITE STAIRCASE 10-standard steel flight Angle of flight 30° to 55° 30° to 38° 39.3° Rise 175 ≤ h ≤ 225 mm - 200 mm Tread ≥ 165 mm ≥ 125 mm ≥ 150 mm 230 mm Overlap -25 ≤ a ≤ 55 mm - -15 mm Step width 500 mm min. 550 mm ≤ width < 750 mm ≤ 750 mm 566 mm Step run ≥ 175 mm - 245 mm Step size (Blondel) 540 ≤ 2h + g ≤ 660 mm 647 mm Non slip, self draining steps yes yes Headroom ≥ 1.90 m > 2.25 m 2.50 m Lateral protection - rail, midrail and toe board rail, midrail and toe board Working load 100 daN/m² 200 daN/m² 300 daN/m² 300 daN/m² Rail/deck distance > 950 mm 1,000 mm Max. opening in the side protection < 470 mm 452 mm Toe board height ≥ 150 mm 150 mm 2.00 m 1.00 m 2.50 m 1.00 m
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