A hall effect sensor would be my first choice.
A a few loops of wire around one of the current carrying conductors would be another, but you'd need to load it, rectify it and filter it so that you got an appropriate signal to feed to an MCU.
A hall effect sensor would be my first choice.
A a few loops of wire around one of the current carrying conductors would be another, but you'd need to load it, rectify it and filter it so that you got an appropriate signal to feed to an MCU.