What is one reason you might get a higher than expected reading on an RFC test?

A higher than expected reading on a residual current fault (RFC) test is often attributed to a loose connection. When connections within an electrical circuit are loose, they can create increased resistance, which affects the flow of current. This increase in resistance can result in readings that do not accurately reflect the proper operational parameters of the system. The additional resistance can cause unintended voltage drops and fluctuations in current, leading to discrepancies in the test results.

In contrast, other issues such as ground faults or short circuits typically lead to different types of readings, usually indicating lower resistance or safety issues rather than elevated readings. Overvoltage could cause other problems, but it would not specifically relate to the reading being consistently higher; it would more likely damage equipment or create safety hazards without manifesting in the same way as a loose connection would during a test.