120V 3 Phase supply on 120V single phase designed system - Earth Fault

[vaughant]

Only seen something similar to this once before and it was the power supply not being tied to earth.it was giving me strange readings all over the place but the giveaway was dim lights and 9v between neutral and earth.turned out the boys had changed a psu but shoved it in the panel at the bottom rather than bolting it up to the metal frame.
Just thinking you maybe getting some odd readings cos of the 2 phases?

 

[plugsandsparks]

What make an model clamp meter are you using?

Kewtech 2434 - earth leakage clamp meter, but also measures up to 100A