This is more of a theoretical question and not something I'm needing to do.
I understand the following, please correct me if I'm wrong;
- Multimeter only measures the potential difference so
- To measure the AC voltage passing through a light switch we need a neutral wire along with the live wire or
- A ground can be used instead as neutral will be earthed somewhere and therefore be connected to ground anyway
So, from my understanding, are we basically treating ground as neutral then in this case?
Can a floating ground be used or must the ground be in the circuit of where the neutral is? I guess this is more a question of how the meter works.
What if no ground or neutral is present, am I out of luck?