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In addition to the flow switch test connection on each floor, a sprinkler system test connection shall be provided for each system to verify proper overall system operation. This test connection should be the connection from the end of the most remote branch line. The discharge should be at a point where it can be readily observed. In locations where it is not practical to terminate the test connection outside the building, the test connection is permitted to terminate into a drain capable of accepting full flow under system pressure. In this event, a test connection should be made using an approved sight test connection containing a smooth bore corrosion-resistant orifice giving a flow equivalent to one sprinkler, simulating the least flow from an individual sprinkler in the system