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– The 50–60 Hz signal from the electricity cable must be stronger along the cable
than in its immediate vicinity. If the wall is very damp or poorly earthed, the signal
will be the same strength throughout the wall. This will result in the measuring tool in-
dicating that it has found a signal over a large area, but it will not be able to detect the
exact location of the cable.
In this instance, it may be helpful to place your free hand on the wall 20–30 cm from
the measuring tool in order to conduct the signal away from the wall. However, you
should not change the position of your free hand during the measuring process.
– Multi-phase (known as three-phase current or heavy current) electricity cables cannot
be detected as live cables because the signals from the different phases cancel each
other out. You can, however, detect multi-phase electricity cables at shallow depths
as metal objects.
– Conductive wall surfaces, such as certain tiles, may result in electricity cables no
longer being indicated or the light-up ring (1) lighting up red over a large area.
– Flat lying electricity cables (up to max. 2–3 cm in depth) may also be indicated as
metal objects. However, this does not apply to solid-wire cables.
Switch off power consumers and make sure that live cables are de-energised be-
u
fore drilling, sawing or milling into walls, ceilings or floors. After performing any
kind of work, check to ensure that objects placed on the substrate are not live.
Information about Object Indication
– When the wood detection function is switched on, other objects, such as water-filled
plastic pipes, power cables or gas lines, may be indicated as non-metallic objects in
certain circumstances. Before drilling, sawing or milling, use other sources of informa-
tion to check that the object found is actually a wooden beam and not another object
(e.g. a plastic pipe, power cable, gas line).
– Nails and screws in the base material may result in wooden beams being identified as
metal objects.
– Wider objects can be identified by the light-up ring (1) lighting up red over a wide
area. Under certain circumstances, wide objects may not be indicated to their entire
extent.
Before drilling, sawing or routing into walls, refer to other sources of informa-
u
tion to ensure that you eliminate hazards. As the measuring results can be influ-
enced through ambient conditions or the nature of the wall, there may be a hazard
even though the measuring indicator (b) does not indicate an object in the sensor
area, no audio signal sounds and the light-up ring (1) lights up green.
Bosch Power Tools
English | 33
1 609 92A 92B | (17.11.2023)
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