VRIOGS 012.0.4 RevA - Public Transport Victoria
VRIOGS 012.0.4 RevA - Public Transport Victoria
VRIOGS 012.0.4 RevA - Public Transport Victoria
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<strong>VRIOGS</strong> <strong>012.0.4</strong> Revision A 11<br />
SECTION 6.0 CIRCUIT NOMENCLATURE AND WRITTEN<br />
CIRCUITS<br />
The main purpose of the following is to supply abbreviated designations for electrical<br />
signalling units, and to provide a permanent record of circuit as installed.<br />
When tagging is made to correspond with the plans it facilitates testing and<br />
maintenance and by the use of the abbreviated designations, plans are more easily<br />
prepared and more easily read.<br />
Circuits diagrammed, using nomenclature as shown, are called written circuits. By<br />
the use of this nomenclature no importance is placed upon the location of the<br />
electrical units with respect to track plan and no attempt is made to show the route of<br />
the wires connecting them.<br />
Note: The DMS contains “sample circuits” with all allowable symbols and standard<br />
circuit drawings.<br />
The units or parts to be connected are arranged so that straight lines may be drawn<br />
from one point to another.<br />
The characteristics, functions and the locations of the units and wires are given by<br />
the combination of letters and numerals.<br />
As far as practicable assigned letters are suggested, either because of usage or<br />
because they are the first letters in the words they represent, for example:<br />
A—Approach B—Block D—Distant H—Home<br />
But many letters stand for names, which cannot be associated, and are arbitrary<br />
symbols only and derived from American Railway nomenclature, for example:<br />
G—Signal (siGnal)<br />
W—Points (sWitch)<br />
Some of the letters represent several different meanings or words, depending on the<br />
use and the location with respect to numerals and other letters.<br />
Some flexibility is allowed to cover the different relative values that will be placed on<br />
the functions or units.<br />
The numerals designate the unit or wire.<br />
SAMPLE CIRCUIT<br />
BX<br />
BX10GR<br />
12TR<br />
10TSR<br />
7LR<br />
10ASR<br />
10RR<br />
10GR<br />
NX<br />
NX10GR<br />
12TR<br />
10TSR<br />
10RR<br />
Figure 1 – Sample Circuit<br />
NOTE: This document is controlled only when viewed on the DOT Engineering Standards website.<br />
Any other copy of this document is uncontrolled, and the content may be inaccurate.
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