GE Mark VIe System Manual page 145

6.6.1.5 Class Codes
Certain conditions can require that specific wires within a level be grouped in the same cable. This is indicated by class codes,
defined as follows:
S Special handling of specified levels can require special spacing of conduit and trays. Check dimension chart for levels.
These wires include:
• Signals from COMM field and line resistors
• Signals from line shunts to regulators
U High voltage potential unfused wires over 600 V dc
PS Power greater than 600 V dc and/or greater than 800 A
If there is no class code, there are no grouping restrictions within designated levels
6.6.1.6 Marking Cables to Identify Levels
Mark the cableway cables, conduit, and trays in a way that clearly identify their signal/power levels. This helps ensure correct
level separation for proper installation. It can also be useful during equipment maintenance.
Cables can be marked by any means that makes the level easy to recognize (for example, coding or numbering). Conduit and
trays should be marked at junction points or at periodic intervals.
6.6.2 Cableway Spacing Guidelines
Spacing (or clearance) between cableways (trays and conduit) depends on the level of the wiring inside them. For correct
level separation when installing cable, the customer should apply the general practices along with the specific spacing values
for tray/tray, conduit/tray, conduit/conduit, cable/conduit, and cable/cable distances as discussed below.
Installation Guidelines
Public Information
GEH-6721_Vol_I_BP System Guide 145