Original Version
Rule 20.5-A
20.5-A. Class C Communication Circuits means circuits which are used for public or private communication service and which operate at not exceeding 400 volts to ground nor 750 volts between any two points of the circuit and the transmitted power of which does not exceed 150 watts. When operated at less than 150 volts no limit is placed on the capacity of the system.
Note: Telephone, telegraph, messenger-call, clock, fire or police alarm circuits are included in this classification and other circuits used for signal purposes in which the above limitations are not exceeded may be included.
(1)
Major Class C Circuits mean
communication circuits which include the following:
More than four conductors (open,
paired or in cable) used chiefly for local exchange service.
Toll telephone or telegraph
circuits used for transmission of messages of the general public, and not
including clack, messenger call, railway signal, police, fire alarm and other
special communication circuits.
(2) Minor Class C Circuits mean communication circuits not installed in the definition of Major Class C Circuits. (see Rule 20.5-A1.)
Strikeout
and Underline Version
Rule 20.5-A
20.5-A.
Class C Communication
Public and Private Circuits means circuits which
are used for public or private communication service and which are
divided as follows:
(1)
Current Carrying circuits operate
operating at potentials not exceeding 400 volts to ground nor 750
volts between any two points of the circuit and the transmitted power of which
does not exceed 150 watts. When
operated at less than 150 90 volts, no limit is placed on
the capacity of the system. Any
circuit which exceeds the above values used for information transport shall be
treated as a supply circuit and must meet the supply requirements for the
voltage involved.
(2) Fiber optic circuits transmitting light for communication purposes (see definition, Rule 20.3 ).
Note:
Information systems
including, but not limited to, Telephone,
telegraph, messenger-call railroad-signal, data, clock, fire or police alarms, circuits
cable television and other systems conforming with the above are
included in this classification. and other circuits used for signal
purposes in which the above limitations are not exceeded may be included.
(1)
Major Class C Circuits mean
communication circuits which include the following:
More than four conductors (open,
paired or in cable) used chiefly for local exchange service.
Toll telephone or telegraph
circuits used for transmission of messages of the general public, and not
including clack, messenger call, railway signal, police, fire alarm and other
special communication circuits.
(2)
Minor Class C Circuits mean communication circuits not
installed in the definition of Major Class C Circuits. (see Rule 20.5-A1.)
Final Version
Rule 20.5-A
20.5-A. Class C Communication Public and Private Circuits means circuits used for public or private communication service and are divided as follows:
(1) Current Carrying circuits operating at potentials not exceeding 400 volts to ground nor 750 volts between any two points of the circuit and the transmitted power of which does not exceed 150 watts. When operated at less than 90 volts, no limit is placed on the capacity of the system. Any circuit which exceeds the above values used for information transport shall be treated as a supply circuit and must meet the supply requirements for the voltage involved.
(2) Fiber optic circuits transmitting light for communication purposes (see definition, Rule 20.3).
Note: Information systems including, but not limited to, telephone, railroad-signal, data, clock, fire or police alarms, cable television and other systems conforming with the above are included in this classification.