Hilti DD 150-U Mode D'emploi page 37

use of a dust mask of filter class P2 is recommended. Observe national regulations applicable to
the materials you intend to work with.
Careful handling and use of electric tools and machines
▶ Secure the workpiece. Use clamps or a vice to secure the workpiece. The workpiece is thus held
more securely than by hand and both hands remain free to operate the power tool.
▶ Ensure that the accessory tools used have a mounting system that is compatible with the drilling
machine and that they are secured in the chuck correctly.
▶ Switch the power tool off and unplug the supply cord in the event of a power failure or interruption
in the electric supply. This will prevent accidental restarting when the electric power returns.
Electrical safety
▶ Before beginning work, check the working area (e.g. using a metal detector) to ensure that no
concealed electric cables or gas and water pipes are present. External metal parts of the machine
may become live, for example, when an electric power line is damaged accidentally. This presents a
serious risk of electric shock.
▶ Never operate the machine without the accompanying PRCD (machines without PRCD: Never
operate the machine without an isolating transformer). Test the PRCD each time before use.
▶ Check the machine's supply cord at regular intervals and have it replaced by a qualified specialist
if found to be damaged. If the machine's supply cord is damaged it must be replaced with
a specially-prepared and approved supply cord available from Hilti Customer Service. Check
extension cords at regular intervals and replace them if found to be damaged. Do not touch the
supply cord or extension cord if it is damaged while working. Disconnect the supply cord plug
from the power outlet. Damaged supply cords or extension cords present a risk of electric shock.
Workplace
▶ When drilling through walls, secure (cordon off) the area behind the wall, as material or the core
may fall out on the other side of the wall. When drilling through ceilings, secure (cordon off) the
area below as drilled material or the core may drop out and fall down.
▶ Use of the water collection system in combination with a wet-type industrial vacuum extractor is
mandatory for upward wet drilling.
▶ Use of the vacuum fastening method for upward drilling is prohibited.
▶ An additional means of securing the drill stand must be employed when the machine is secured
with the vacuum securing method (accessory) for horizontal drilling.
▶ Do not use a hammer or other heavy object when making adjustments to the base plate.
▶ Ensure that the workplace is well ventilated. Exposure to dust at a poorly ventilated workplace may
result in damage to the health.
▶ Approval must be obtained from the site engineer or architect prior to beginning drilling work.
Drilling work on buildings and other structures may influence the static equilibrium of the structure,
especially when steel reinforcing bars or load-bearing components are cut through.
▶ It is recommended that rubber gloves and non-skid shoes are worn when working outdoors.
Personal safety
▶ The diamond core drilling machine and the diamond core bit are heavy. There is a risk of crushing parts
of the body. The user and persons in the vicinity must wear suitable protective goggles, a hard
hat, ear defenders, protective gloves, protective footwear and light respiratory protection while
the tool is in use.
*434949*
Printed: 09.08.2019 | Doc-Nr: PUB / 5069546 / 000 / 09
434949 English 29