Note: The highest rated cable (Belden 9410) can be used in all situations.
5.5.4 Current Capacity
The maximum continuous current rating for a cable is limited by conductor size, number of conductors contained
within the cable, maximum temperature rating of the cable, and environmental conditions such as ambient
temperature and air flow. Use the below as a guide to select a cable with suitable current rating.
Figure 12: Cable Current Capacity Chart
5.5.5 Vehicle Ground Terminations
The star point for the power supply grounds (negative terminals) of the automotive vehicle system units shares a
common termination point, thus providing a controlled system ground reference point.
5.5.6 Vehicle Ground Termination Checks
The ground connection resistances of all installed automotive vehicle system units should be measured to ensure
good conductivity.
Connection should be referenced to the Transit System Ground Star Point. The resistance from any negative
power connection to the star point should be less than 0.5.
5.6 Hot Plugging
Warning: It is strongly recommended that Hot Plugging (inserting / removing the Molex iGrid
Connectors whilst power is connected) should be avoided where possible.
Warning: If this is not possible, then it is also strongly recommended that the orientation on the
connectors is double checked before inserting.
For example: If a 4x 20AWG copper
cable is used, the RMS current per
conductor at 10°C rise above
ambient
= 3.7A (from chart) x 0.8 (from table)
= 2.96A
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