Inspecion of butyl rubber coated glass-fibre insulators on M.S.J. & A. Line on 21 Mar 72. (TN-ETR-006)

Sixty butyl rubber coated glass-fibre under-bridge support arms, installed on the M.S.J. and A line of the L.M. Region, were first energised at 25 kV 50 Hz on 3 May 71. An inspection of these insulators was arranged to take place on 21 Mar 72 because two insulators had failed...