Where stays are used to support divisions loaded on both
sides, they shall be fitted horizontally or as near thereto as practicable,
well secured at each end and formed of steel wire rope. The sizes
of the wire rope shall be determined assuming that the divisions and
upright which the stay supports are uniformly loaded at 4.9 kN/m2.
The working load so assumed in the stay shall not exceed one third
of its breaking load.