Alpha Technologies Cordex CXPS-D 48-2500_5000A - Manual (Page 45)

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6.3.2 Connecting the power plant frame ground
The power plant frame must also be connected to the MGB or FGB—see Figure 30. This is done for personnel
safety and to meet many telco-grounding requirements. Cable should be #6 AWG (16mm) for small to medium
size power plants and #2/0 for large plants (> 800A).
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