SR EN 50306-1:2003

EN 50306 1 specifies the general requirements applicable to the cables given EN 50306 2, EN 50306 3 and EN 50306 4. It includes the detailed requirements for S1 and S2 sheathing materials and other components called up in the separate Parts. NOTE 1 Detailed requirements for insulation systems are given in EN 50306-2. In particular EN 50306 1 specifies those requirements relating to fire safety which enable the cables to satisfy Hazard Levels 2, 3 or 4 of EN 45545-1 ). NOTE 2 Requirements for the emission of smoke and gases are not specified for Hazard Level 1 of EN 45545 1. NOTE 3 EN 45545-1 is still under development and should be consulted. These cables are rated for occasional thermal stresses causing ageing equivalent to continuous operational life at temperatures of 90 ?C or 105 ?C dependent upon the sheath system type. These temperatures are based upon an acceptance test, using long-term thermal endurance ageing at 110 °C and 125 °C respectively, and extrapolation of data to 20 000 h. The maximum temperature for short circuit conditions is 160 °C based on a d