Yeah, I dug this up when wondering why it mattered that the sensor for the wireless power usage meter I have could be clamped to either live or neutral but was

Yeah, I dug this up when wondering why it mattered that the sensor for the wireless power usage meter I have could be clamped to either live or neutral but was told by the building manager that it had to go to live; yet I wasn't convinced. Anyway, as you say .. mystery now clear.