This is the power adapter cable to which Tari is referring. The male end connects to the internal booth power cord (that attaches to the R6 unit) and the female end attaches to the electrical tester. Photo and info courtesy of Lesley Thompson and her work with JoCo. This adapter (and the electrical tester) are required to test the R6 booth wiring for proper AC output and polarity.
BTW: As to Don's thoughts of using a 3 prong to 2 prong adapter, for electrical safety reasons, it is not recommended to operate our equipment on an ungrounded outlet.
Ian S. Piper
Diebold Election Systems, Inc.