We have a 3 phase installation for our dimming control system for our lighting system. During inspection while our 3 phase is safe with lock out tag out. Normally, we will get a low voltage reading from phase to phase less than 3 V.
This time, we encountered a phase to phase low voltage reading more than 3 V with a fluctuation up to 6 V.
- What can cause this higher voltage?
- What is this called, Unbalance load?
- How can we correct this?