Electrical Safety - Hilti DD100 Mode D'emploi

Safety precautions on the jobsite
Before beginning work with the drilling system, read the oper-
ating instructions carefully and ensure that the saftety pre-
cautions listed below are observed.
Please also note that permission to begin drilling work must be
obtained from the site engineer or other authorised person.
● Ensure that no electric cables, gas or water pipes etc. are
situated where holes are to be drilled.
● Cables, pipes or other supply lines situated in close prox-
imity to where holes are to be drilled must be switched off.
● The drilling work must not have a negative effect on the
structural design of the building (drilling through steel re-
inforcement!).
● Cordon off areas where drilling work is taking place, partic-
ularly behind/below walls or ceilings which are being drilled
through.
● Wear a helmet, safety shoes, gloves and ear protectors.
● Tidiness and good organisation on the jobsite help to pre-
vent accidents.
● Use only original Hilti parts.
● Protect the motor unit from water spray and rain.
● For overhead drilling, the water collector and water removal
system must be in good order and function correctly.
● The wet drilling system must only be operated with the built-
in PRCD fault interruptor (GB-with isolating transformer).
● In order to ensure safe, trouble-free operation, the drilling
system must be kept clean. (Do not clean using a jet of
water.)
●Drilling work should only be carried out by trained person-
nel.
● If leakage occurs in the water supply system, the equipment
must be serviced.
● Do not touch rotating parts.
● Before using the tool, ensure that the chuck is clean
and the core bit to be used is not damaged (e.g.the core
bit must not wobble or run out of true when the chuck
lever is closed). Worn or broken parts on the electric
tool or core bit must be replaced immediately.
10
Printed: 07.07.2013 | Doc-Nr: PUB / 5069507 / 000 / 00
Preparations before beginning work
In addition to the safety precautions, the following preparations
at the jobsite must be made.
– Make sure that a water connection or pressurized con-
tainer with continuous water flow is available.
– Make preparations for the flow of water. If necessary, install
water extraction equipment.When drilling into hollow build-
ing components, find out where the drilling water is likely to
flow, in order to avoid damage.
– A power supply with earth/ground connection must be avail-
able for use.
– Measure out and mark holes to be drilled.
– Safe electrical operation of the DD 100 can only be guar-
anteed as long as moisture is prevented from entering the
motor. All electrical safety precautions can only reduce the
consequences of allowing water to enter a DD100 motor,
but not eliminate them. A DD 100 motor which has be-
come wet must be serviced by the electrical specialists at
a Hilti centre.
Caution: When drilling overhead you have to use a prop-
er water collector, replace a leaky water extraction de-
vice/sealing disc immediately (see page 8), if not your life
could be in danger.
Additional safety precautions:
– When drilling, make sure you have a secure position to work
from.
– Hold the DD 100 firmly with both hands.
– Pay attention and concentrate on the job when working.

Electrical safety

The PRCD (DD100 wet drilling machine) fault interruptor pro-
tects the operator in case of faults in the insulation of the mo-
tor unit or supply cord (between the PRCD and the motor unit).
This device also prevents the machine from restarting of its own
accord when power returns after an interruption in the power
supply.The earth/ground connection protects the operator from
dangerously high voltages in case of drilling into live cables.The
protective function of the ground fault interruptor must be checked
at regular intervals in accordance with regulations issued by
national authorities.