A scaffold must either be erected to a recognised standard configuration, such as those in National Access and Scaffolding Confederation (NASC) document TG20 Volume 1 for tube and fitting scaffolds, or the manufacturers’ guidance for system scaffolds, or it must be designed by calculation to ensure it has adequate strength and stability.
For more information see the[National Access and Scaffolding Confederation website ](http://www.nasc.org.uk/).