Isolation Transformer: Why Load Connects to Primary Side

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HP-
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Why does the load connect back to the primary side of the transformer?
Circuit schematic of an isolation transformer: a 50 Hz sine source V1 drives the primary winding, the secondary feeds a box labelled LOAD, and the load's return wire and the source neutral both connect to a common ground symbol.
 
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HP- said:
Why does the load connect back to the primary side of the transformer?
Circuit schematic of a 50 Hz sine voltage source V1 feeding an isolation transformer, with its secondary winding connected to a box labelled LOAD and both secondary terminals referenced to a ground symbol.
Welcome to the PF.

That defeats the purpose of an isolation transformer. Don't do that.
 

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