Original Version
GO 128 Rule 20.4
20.4-C. Railway Signal Circuit means those supply and communication circuits used primarily for supplying energy for controlling the operation of railway block signals, highway crossing signals, interlocking apparatus and their appurtenances. Railway signal circuits which operate at less than 400 volts to ground may be considered as private communication circuits provided that if the potential exceeds 150 volts between conductors, the power transmitted shall not exceed 150 watts. Where all the circuits and underground system are owned and operated by one utility, the potential between conductors carrying in excess of 150 watts may be increased to not more than 250 volts. Railway signal circuits not meeting the foregoing requirements shall be treated as circuits of a supply system. (Rule 23.3.)
Strikeout and Underline Version
GO 128 Rule 20.4
20.4-C.
Railway
Signal Circuit means those supply and communication circuits used primarily for
supplying energy for controlling the operation of railway block signals,
highway crossing signals, interlocking apparatus and their appurtenances.
Railway signal circuits which operate at less than 400 volts to ground may be
considered as private communication circuits provided that if the potential
exceeds 150 volts between conductors, the power transmitted shall not exceed
150 watts. Where all the circuits and underground system are owned and operated
by one utility, the potential between conductors carrying in excess of 150
watts may be increased to not more than 250 volts. Railway signal circuits not
meeting the foregoing requirements shall be treated as circuits of a supply
system. (Rule 23.3 23.5.)
Final Version
GO 128 Rule 20.4
20.4-C. Railway Signal Circuit means those supply and communication circuits used primarily for supplying energy for controlling the operation of railway block signals, highway crossing signals, interlocking apparatus and their appurtenances. Railway signal circuits which operate at less than 400 volts to ground may be considered as private communication circuits provided that if the potential exceeds 150 volts between conductors, the power transmitted shall not exceed 150 watts. Where all the circuits and underground system are owned and operated by one utility, the potential between conductors carrying in excess of 150 watts may be increased to not more than 250 volts. Railway signal circuits not meeting the foregoing requirements shall be treated as circuits of a supply system. (Rule 23.5.)