supply of 4 sq mm (equal qty. in black, blue, red and yellow color) single core thin walled electron beam irradiated copper cable4 sq mm (equal qty. in black, blue, red and yellow color) single core thin walled electron beam irradiated copper cable,4 sq mm (equal qty. in black, blue, red and yellow color) single core thin walled electron be am irradiated copper cable with copper conductor working voltage above 750 v and up to 1.8/3.0 kv suitab le for rollingstock application as per rdso specification no. elrs/spec/elc/0019 rev.4 of feb 2018 or lates t. [ warranty period: 30 months after the date of delivery ] ] => limited