The American National Standards Institute has accepted the ESTA Technical Standards Program's standard for aluminium trusses and towers as an American standard. ANSI E1.2-2000, describes the design, manufacture and use of aluminium trusses, towers and associated aluminium structural components such as head blocks, sleeve blocks, bases and corner blocks. It does not cover individual, separate rigging hardware such as ½ couplers and shackles. E1.2 was one of the many projects of the Rigging Working Group which is also working on standards for manually powered and motorised rigging systems, stage house and structural requirements, flying performers, speaker enclosures.
