Original General Order 95

Section VII

Detailed Construction Requirements for Trolley and Electric Railway
Contact and Feeder Conductors and Their Supporting Messengers,
Span Wires, Etc. (Class T Circuits)

77.3    Material and Strength

A.    Material

Span wires, backbones, messengers, etc., shall be stranded and of galvanized steel or other corrosion-resisting material of equal durability.

B.    Strength

The strength of span wires, backbones, messengers, etc., shall be such that the safety factors of Rule 44 are not met.