Amprobe ACF3000-AK AC Current Probe - Manual (Page 11)

Operation
7
The flexible current probe is not for use on conductors with a
potential of over 600V.
Wrap the flexible measuring head around the conductor to be tested,
close coupling. Energize circuit under test. For most accurate
measurement, center the flexible head around conductor. Locate coupling
away from nearby conductors.
Do not use the flexible current probe to measure bare
conductors unless wearing protective clothing suitable for
high voltage work. Always use appropriate equipment for
personal protection.