General Order 64
Section VI
Detail Construction Requirements For Supply Lines
68 Street Lamps. (See Appendix E. Figs. 8 and 9.)
(a) Clearance from Pole: All exposed metal parts of lamps and all such parts of their supports, unless insulated from the parts of their supports, shall be maintained not less than 20 inches from the surfaces of pole structure if of wood (unless at pole tops). This rule shall not apply if the voltage of the circuit, from which the lamp is supplied does not exceed 750 volts.
(b) Cutout: A suitable device shall be provided by which each street lamp on series circuits of over 300 votls to ground may be safely and entirely disconnected from the circuit, before the lamp is handled, unless the lamps are worked on from the poles or from suitable insulating stools, platforms or tower wagons. Exempted from this provision are lamps such as incandescent lamps which in themselves present a noncurrent carrying surface which may be utilized as a handle in removing them their support.
(c)
Insulators
in Supports: Wherever a series
street lamp is supported by a span wire a strain insulator shall be inserted in
the span wire on both sides of the lamp, nor more than 9 feet nor less than 6
feet from the supporting structures.
Where metallic ropes or
chains are used for the suspension of street lamps, said ropes or chains shall
be of such length that when the lamp is in its normal position the lower end of
the chain or rope will not be less than 8 feet from the ground, or a strain
insulator shall be inserted in the free end of the rope or chain ata point not
less than 7 ½ feet from the ground when the lamp is in its normal position.
In case this construction
will not permit the lamp to be lowered sufficiently for trimming purposes, a
nonmetallic rope shall be used.
(d) Lamps on Transformer Pole: Where it is necessary to install an arc or an incandescent lamp on a pole supporting a transformer, the lighting unit shall be suspended so that it can be trimmed from the ground, or from a stand located on the pole, not less than 7 feet below the transformer, provided that in so suspending the lamp (where a transformer is located on the same pole) no wire or cable in connection therewith shall be run vertically on the pole, unless the wire or cable is protected in accordance with Rule 63 (d).