This standard applies to plugs and socket-outlets, cable couplers and appliance couplers,
hereinafter referred to as accessories, for use when the ambient temperature is normally within
the range of –25 °C to +40 °C. These accessories are intended to be connected to cables of
copper or copper alloy only.
以上是IEC60309的使用范围,只到40度,很多情况下环温都超过40了,如果60度的样子,适用什么标准?