BS 1722-2:2020 pdf download.Fences-- Part 2: Specification for strained wire and wire mesh netting fences.
The previous standard focused heavily on line wire and droppers that have in subsequent years been largely replaced by mesh netting, so the reduction of this section to a reduced number of core infrastructure usage areas is reflected in the new Table 1.
The move away from concrete posts to wood and metal has seen the specifications of fencing change, and the machinery used has evolve to further change the installation process and enhance the requirements for achieving the recommended tensions. There are examples of minimum construction requirements in Clause 5, Installation', with updated drawings as Figures 1 and 2.
The changes in materials, higher mechanization and the more common use of high tensile wire have benefited the end-user by enabling a fence that does not need to be tensioned annually to keep it functional, but there is an increase in requirements for materials and methods of erection to allow it to withstand the added tension on the fence line. Examples are given in Tables 3, 4 and 5.
The length of fence lines with mesh fencing has also increased, so reducing costs but increasing the size and functionality of straining structures needed and also reducing the individual number required to achieve the desired fence. This is reflected in the revised standard. With high tensile we have fences that retain greater strain for a longer period. Notes on this can be found in Subclause 5.1 of the standard.
