Bs en 611112009 gives increased worker protection against very high voltages ribbed surface gives increased underfoot traction for prevention of slips manufactured with colour coded tape depicting matting classification on reverse of matting the matting comes in 1m widths and three thicknesses 3mm meets class 0 tested to 10kv with a working voltage of 1kv 4mm meets class 2 tested to 30kv with a working voltage of 17kv 5mm meets class 4 tested to 50kv with a working voltage of 36k