Testboy TB-2200 Mode D'emploi page 21

When carrying out the cable break detection, if the display does not flash and no
acoustic signal is emitted, a dangerous high voltage (>33 V AC or 70 V DC) may
nevertheless be present. The non-contact sensor can only detect voltage generat-
ed by sufficiently strong electric fields from power sources (grids, >100 V AC). If the
field strength is low, the instrument may not detect applied voltage and thus cannot
locate the cable break correctly. If the instrument does not detect any existing volt-
age, this can be due to the following factors, amongst other things:
- Shielded wires/cables
- Thickness and type of insulation
- Distance from the voltage source
Exercise caution at voltages above 30V, as there is a risk of electric
shock.
Caution!
The non-contact cable break detection function is not suitable for the detection of
hazardous line voltage.
Before touching conductive parts the absence of hazardous voltage must be
checked with the two-pole direct contact measurement of the AC-Voltage range.
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