SAFETY AND PRE-USE CHECKS
Throughout this instruction sheet there are a number of warnings which must be observed to ensure
safe operation of this unit. These warnings are identified by the following symbol:
PEM accepts no responsibility for any accidents or damage resulting from careless use, or non-
observance of these instructions.
THE ROGOWSKI COIL
The integrity of the insulation around the Rogowski coil itself should be VISUALLY
INSPECTED before use, and the unit should NOT BE USED if there are signs of damage.
When bending the flexible coil around a conductor, avoid tight bends and sharp edges that
could damage the coil.
The voltage rating (safe PEAK working voltage) is clearly labelled on the coil. The rating is
normally 10kV peak. The removable silicone sleeve supplied with the coil provides
mechanical protection.
The ratings are derived from the following standard test. All coils supplied by PEM are
flash tested for 1 minute at 15kVrms using a 50Hz sinewave. Coils are tested without the
10kV sleeve fitted. The test also covers the ferrule connecting the coil to the cable.
For additional safety it is recommended that the ferrule is not situated in direct contact with
conductors at voltages higher than 8kV peak. See also “Obtaining the Best Measurement”.
The voltage ratings are appropriate for intermittent use of the CWT as a test instrument
and not for continuous use in a permanent installation.
For permanent installation the coil should be situated such that corona, which would
eventually damage the coil insulation, cannot occur. For information regarding permanent
installation of PEM‟s Rogowski coils on high voltage equipment please consult PEM.
Voltage ratings are only valid if the „free-end‟ of the coil is fully inserted into the socket, and
remains fully inserted during use.
The „free–end‟ will be fully inserted when the user feels the free-end of the coil engage with
the internal click-in mechanism inside the ferrule.
Visual indication that the coil mechanism is fully inserted is provided by the black coil
marker situated near the end of the coil, as shown opposite
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