Typical design data of 33-36kv Composite Insulators Nominal System Voltage kv Min. Creepage Distance mm Section Length mm Rated Mechanical tensile load kN Wet Power freq. 1 Min. withstand voltage kV Dry lighting impulse withstand voltage kV 33 860 490 45-60(T C) 75 175 33 860 510 45-60(T C) 75 175 33 860 510 70 (B S) 75 175 33 900 510 70 (T C) 90 230 33-36 900 530 70-95 (T S) 90 230 33-36 925 440 10 (PIN) 75 175 33-36 950 440 10 (PIN) 90 230 33-36 925 410 10 (POST) 75 175