The rooms for generating and driving machines must be accessible only
to workers assigned to the operation and maintenance of these
machines. In cases where these are not located in a separate room,
they must be isolated by rigid and fixed protective partitions or barriers
at least one meter high.
The passages between machines, mechanisms, and tools powered by
motors shall be at least 80 cm wide. In the gaps, the ground is leveled
and made non-slip.
All devices, machines, or parts of machines recognized as dangerous
must be placed or protected in such a way as to prevent the personnel
from voluntarily or involuntarily coming into contact with them during
The following in particular are recognized as dangerous:
(a) Machine parts with control and transmission devices such as pulleys,
wheels, flywheels, shafts, gears, friction cones or cylinders, chains,
cams, slides, etc.
(b) Machine parts intended to be coupled to another machine or to
receive mechanical energy, transmission belts, and cables;
(c) Machine elements with accessible parts that project from the
moving parts of these machines, such as stop screws, buttons, and keys;
(d) All other machines or elements likely to cause an accident, such as
machines for beating, crushing, cutting, kneading, pressing, triturating,
(e) Gas or vapor pressure equipment operated at a pressure higher
than atmospheric pressure.
Machine tools with cutting instruments rotating at high speed, such as
sawing, milling, planing, cutting, chopping machines, shears, and other
similar devices are arranged in such a way that the workers cannot
involuntarily touch the cutting parts from their workstation.
No worker shall be habitually engaged in any work in the vicinity of a
flywheel, grinding wheel, or any heavy machine rotating at high speed.
Any grinding wheel rotating at high speed shall be so mounted or
encased that in the event of breakage, the fragments will be restrained
either by the mounting devices or by the casing.
A very visible sign, placed near the wheels and other machines that
weigh and turn at high speed, indicates the number of revolutions per
the minute that must not be exceeded.
Except when the engine is stopped, the belts are always held in place
using a clutch lever and not directly by hand.
The collective starting and stopping of machines operated by a control
must always be preceded by an agreed signal.
The stopping device of the driving machines is always placed outside
the danger zone and in such a way that the drivers who operate these
machines can easily and immediately activate the aforementioned
In addition, each machine is arranged in such a way that it can be
isolated by its operator from the control that operates it, using a
It is forbidden to clean and lubricate the transmission and operating
In case of repair of any mechanical device, its stop must be ensured by
the proper positioning of moving parts whose accidental movement
would be likely to injure the workers; it is the same for the cleaning
operations of mechanical devices at the stop.
Workers who have to stand near running machinery must wear tight-
fitting, non-floating clothing.