Before revision: Although the combined cross sectional area of the braid may meet the adiabatic equation requirements for earthing the nature of the braid being made of very fine strands coupled with the comparatively large gaps, when compared to SWA cable, means that under short circuit conditions the fine strands can melt and so the braid will no longer be in contact with a penetrating object such as a screw or URL Some SY cables on the market are of poor standard, with cases of GSWB coverage being less than 20%.
After revision: ,Although the combined cross sectional area of the braid may meet the adiabatic equation requirements for earthing the nature of the braid being made of very fine strands coupled with the comparatively large gaps, when compared to SWA cable, means that under short circuit conditions the fine strands can melt and so the braid will no longer be in contact with a penetrating object such as a screw or URL Some SY cables on the market are of poor standard, with cases of GSWB coverage being less than 20%.