User manual

English | 25
Bosch Power Tools 1 609 92A 3P0 | (18.4.17)
“Metal” mode (see figure C)
“Metal” mode is designed solely for finding objects made of metal (e.g. copper pipes
or reinforcing steel), regardless of the nature of the wall.
In this operating mode, live cables are not displayed as “Current”. For this purpose,
the “Metal” and “Current” modes can also be selected at the same time.
“Current” mode (see figure D)
“Current” mode is designed solely for finding single-phase live cables (110–240 V,
50–60Hz).
Preparing to take measurements and features of the measuring process:
– The cable must be live. You should therefore connect electricity consumers (e.g.
lights, appliances) to the electricity cable you are trying to find. Switch on the elec-
tricity consumers to ensure that the electricity cable is live.
– The 50–60 Hz signal from the electricity cable must be able to reach the
measuring tool. If the cable is in damp walls (e.g. >50 % humidity), behind metal-
lic foil (e.g. thermal insulation) or in an empty metal pipe, the signal will not reach
the measuring tool and you will not be able to find the cable.
– The measuring tool must be sufficiently earthed. Always hold the tool firmly by
the handle (without wearing gloves). Make sure that you are in good contact with
the floor. Insulating shoes, ladders or platforms may compromise your contact
with the floor. The floor must also be earthed in order for live cables to be
detected.
– 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 dry or poorly earthed, the
signal will be the same strength throughout the wall. This will result in the measur-
ing tool indicating 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.
If you are unable to detect the cable in “Current” mode, you may be able to find it as
a metal object in “Metal” mode. Please be aware that the maximum detection depth
is low (approximately 2–3 cm). While solid-wire cables can be detected in “Metal”
mode, stranded-wire cables cannot.
Multi-phase (known as “three-phase current” or “three-phase alternating current”)
electricity cables cannot be detected in “Current” mode because the signals from the
different phases cancel each other out. You can, however, detect multi-phase elec-
tricity cables as metal objects in “Metal” mode. The maximum detection depth is
somewhat higher than that for single-phase electricity cables.
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