This standard specifies the required characteristics and test procedures for fire resistant or fire-proof electrical cables for use in aircraft electrical systems. These cables shall also maintain a specific surface resistance when they are subjected to a flame of 1 100 ??after 5 minutes (fire resistant) or 15 minutes (fire-proof) exposure. They shall be rated at an a.c. voltage of 600 V r.m.s.@ a frequency of maximum 2 000 Hz and a long term temperature of up to 260 ??(ambient temperature plus temperature rise in conductor).