No they are on the same phase - I used to have 3 phase but I moved everything to a single phase… still need to log with eskom to remove the other 2 phases.
Then you need to use the multimeter to check the voltage at the point of connection to the voltage protection device.
If they are both properly connected and tight and at the same voltage on the input side of the device then you possibly have a faulty reading from one of the devices.
It’s pretty simple to find a YouTube video on how to read voltage with a multimeter.
Very likely. A bad connection will tend to make it read lower rather than higher.
The only time a bad connection causes a higher reading is when the device is MAKING power. Then the additional impedance pushes the voltage up on the generation side.
Something else you can do is to swap the two devices and see if the problem moves with the device. I mean, I probably wouldn’t do that (mess with the perfectly good one) if the multimeter already tells me that the device is likely not properly calibrated… but it is something you could do if you had to diagnose without a multimeter.
Beware of meters (displays) showing volts and amps etc. on cheaper products. I had an Amp-hour meter that displayed the measured current which was hopelessly inaccurate!
Sorry forgot to post back to say this is solved. I took it back to ACDC and apparently it wasn’t configured correctly (not sure how/why) but I connected it back and it’s working fine.