• BS EN 39 - 2001 : Loose steel tubes for tubes and coupler scaffolds - Technical delivery conditions.
• EN 74 - 1 - 2005 : Couplers, Spigots pin and base-plates for use in falsework and scaffold - Part 1: Coupler for tubes - Requirement test procedures.
• BS 1139-2.2 - 2009 : Aluminium couplers and special couplers in steel - Requirements and test procedure.
• BS EN 1004 - 2004 : Mobile access and working towers made of prefabricated elements - Material, dimension, design load, safety and performance requirement. • BS EN 131 - 1993 : Ladder.
• SS280 - 2006 : Metal Scaffoldings.
• JISA8951 - 1995 : Tubular Steel Scaffolds.
• ANSI A14.2 - 2007 : Safety requirement for portable metal ladder.
• ANSI A14.7 - 2006 : Safety requirement for mobile ladder.