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No. The selector switch illustrated below is only standard on 3000 SERIES load banks designed to be moveable.
This selects whether the fan and controls power supply to be provided from either the external mains supply (External) or from the Supply-on-Test (Internal).
For static application, it’s expected that the load bank will have a permanent hardwired auxiliary supply. The cables for the external supply can be fed into the load bank through a separate gland plate. The external supply should be connected using the terminals provided inside the load bank.
Supporting Document: 3000 SERIES Load Bank Manual