Navistar IC Bus Electric CE Series Instruction Sheet page 5

High-Voltage Labels (cont.)
Figure 4. High-Voltage Isolation Levels / Zones for 2-String Vehicles (Viewed from Bottom)
If there are no high-voltage battery stacks between the rear wheels of the vehicle and the rear bumper, the level
2 and 3 zones are located as shown in Figure 4. This is called a "2-String" configuration.
Figure 5. High-Voltage Isolation Levels / Zones for 3-String Vehicles (Viewed from Bottom)
If there is a battery stack between the rear wheels of the vehicle and the rear bumper, the level 2 and 3 zones
are located as shown in Figure 5. This is called a "3-String" configuration.
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