Original Version
Rule 89.2
89.2 Construction and Operation
Private communication circuits shall be constructed and maintained throughout (by suitable coordination with supply circuits or by the use of arresters, drainage coils, insulating transformers, or other suitable devices) so as to prevent, under normal (neither transient nor fault) conditions, an induced potential in excess of 400 volts to ground or 750 volts between any two points on the circuit.
Private communication circuits or sections thereof shall be constructed and operated as Minor Class C circuits, and shall be consistently so treated with regard to volt- ages, clearances and strengths of construction except as provided in Rule 89.2-A where supported on the same crossarms with supply conductors.
See Rule 78.2 for provisions applicable to private communication circuits supported on trolley span wires.
Strikeout and Underline Version
Rule 89.2
89.2 Construction and Operation
Private
communication circuits shall be constructed and maintained throughout (by
suitable coordination with supply circuits or by the use of arresters, drainage
coils, insulating transformers, or other suitable devices) so as to prevent,
under normal (neither transient nor fault) conditions, an induced potential in
excess of 400 volts to ground or 750 volts between any two points on the
circuit.
Private
communication circuits or sections thereof shall be constructed and operated as
Minor Class C circuits, and shall be consistently so treated with regard to
volt- ages, clearances and strengths of construction except as provided in Rule
89.2-A where supported on the same crossarms with supply conductors.
See Rule 78.2 for provisions applicable to
private communication circuits supported on trolley span wires.
Final Version
Rule 89.2
89.2 Construction and Operation
Private communication circuits shall be constructed and maintained throughout (by suitable coordination with supply circuits or by the use of arresters, drainage coils, insulating transformers, or other suitable devices) so as to prevent, under normal (neither transient nor fault) conditions, an induced potential in excess of 400 volts to ground or 750 volts between any two points on the circuit.
Private communication circuits or sections thereof shall be constructed and operated as Class C circuits, and shall be consistently so treated with regard to volt- ages, clearances and strengths of construction except as provided in Rule 89.2-A where supported on the same crossarms with supply conductors.
See Rule 78.2 for provisions applicable to private communication circuits supported on trolley span wires.