The ready wire is equipped with insulation material of A-H heat class. Two materials are used the most frequently: NC paper serves for insulating the coiling material of oil transformers and NOMEX is used for air-cooled transformers and rotary machines.
For wires insulated with NC, besides the dimensions of the lead please specify the increased dimensions of width and thickness, and for wires insulated with NOMEX the number of insulating layers. In this case the extent of the increase is 0,2 mm/layer.