Clean -70 insulator string (eight standard glass cap
and pin insulators) dry leakage current is ca. 1 mA. Wetted
clean glass insulator string’s highest leakage current is ca.
1.5 mA (wetted with rainwater) and ca. 2.0 mA (wetted with
tap water) (Fig. 7). Wetted naturally contaminated glass
insulator string’s highest leakage current was ca. 9.5 mA
(Fig. 8).