"450/750 V thermosetting insulated, single-core non-sheathed, copper cable, with solid or stranded conductor, with low emission of smoke and corrosive gases when affected by fire, suitable for conductor operating temperature not exceeding 90oC – code designation H07Z-U and H07Z-R of BS 7211:1998"
即係條cable 比火燒時,會發出低煙,同埋唔會release 有毒的物質
亦都係因為lsoh cable 用thermosetting(XLPE) material 做insulation ,max operating temperautre 可以去到90 degree, current carrying capcity 較PVC cable 高
以下係節錄自EMSD 的COP for electricity(wiring) regulations