Portable roof ladders. Specification1 Scope This British Standard specifies requirements for portable roof ladders specifically designed solely to provide temporary access to pitched roofs with angles between 25 and 65 for tasks that are of short duration and low risk. In particular, it specifies: a) general design features, requirements and test methods; b) the supporting elements, the bearers and ridge hook, and their connections to the ladders, including how a ladder is supported and

test reports

BS EN IEC 60793‑1‑49 describes measurement methods and test procedures

initially for vehicles with hard wired interface and CAN interface

This part of ISO 21028 is not applicable to unalloyed steels and cast materials

In addition

What is BS EN 3614 - Hexagonal head bolts about

for example conditioning or annealing

What is BS 4651-2 - Ammonia content of the ammonia solution about

London W4 4AL

in chloralkali works

BS EN 4346 specifies the requirements relating to:

NOTE Due to masking from physiological noise in the occluded ear tests