VDE Bent Knives with Insulation 50 mm insulation with a dip coat Three-layer safety insulation marked with color codes According to IEC 60900 3, multi-layer coating with distinct colors designating safety, danger, or high danger is appropriate for working on live equipment up to 1000 V. additionally a fourth in black to further shield the handle edges This establishes a visual warning system in addition to offering protection. The user will be alerted if the outer layer of insulation is damaged because the lighter color underneath will show through. At the conclusion of the manufacturing cycle, every single tool is tested to 10,000V for 10 seconds.