Weather resistant insulation for line wires

GREAT ADVANCES have been made in the art of producing insulation for higher voltage cables, but it is only within the last two years that any unified and organized attempt has been made to improve the weathering and insulation qualities of the covering of weatherproof line wire. The relatively high cost and poor operating performance of weatherproof coverings on overhead lines of 4,000 volts and less, indicated the necessity for taking steps to improve the weatherproof covering or to discontinue its use entirely.