(4) A powered machine that is attended by more than 1 employee shall be equipped with
an actuation device for each employee who is exposed to a point of operation hazard. The
machine shall activate only after concurrent use of all actuation devices.
(5) When unexpected motion would cause injury, precautions shall be taken to prevent a
machine from automatically restarting upon the restoration of power after a power failure.
(6) Where a machine work station is remotely located from the machine controls, either a
red emergency stop device shall be provided at the machine work station if a hazard exists
that could cause an injury or the actuation of the controls shall require continuous
depression during the hazardous portion of the machine cycle.
(7) Equipment that is operated in series so that one piece of equipment automatically
supplies another shall be interlocked so that when any equipment in the series is stopped
for any reason, the initial stopping causes the upstream equipment to stop if continued
operation would create a hazard. Reactivation shall require a separate positive action by
the employee who initiated the stop.
History: 1979 AC; 1993 AACS.
R 408.10034 Machine guards and devices.
Rule 34. (1) Two hand-control devices shall be the anti-tie down type and located in a
manner to prevent bridging. Operation shall require manual activation of both controls until
a point is reached in the cycle where the operator cannot remove his or her hands and place
them within a pinch point. If repeating would cause an injury, an anti-repeat device shall
be incorporated into the control system.
(2) Guards shall be secured to the machine, if possible, or to other fixed objects. The guard
shall not create a hazard in itself.
(3) A point of operation guard or device shall be as prescribed in a specific standard, or,
in the absence of a specific standard, shall be designed and constructed, when required, to
prevent the machine operator exposed to the hazard from having any part of his or her body
in the hazardous area during the operating cycle. A guard or device for the point of
operation of a nonproduction arbor press or straightening press is not required if the
machine is equipped with a hand control that is designed to stop the ram action or return
the ram to the up position when released.
(4) Hand tools shall not be substituted for the required guarding or point of operation
devices, except that a hand tool may be used as prescribed in subrule (5) of this rule for a
press brake operation. Where hand tools are used for placing into, and removing material
from, a point of operation, they shall be designed so that the operator is not required to
place a hand within the point of operation.
(5) A bending operation on a press brake involving less than 25 pieces of 1 specific bend,
if not guarded, shall require the use of a hand tool when the operator must hold the work
piece within 4 inches of the point of operation, and a conspicuous sign shall be posted on
the machine stating "Hand tools shall be used to hold stock."
(6) A revolving barrel, container, or drum exposed to contact shall be guarded by a
standard barrier, an enclosure, or equivalent protection where a hazard exists. Access
through a standard barrier or enclosure shall be by a gate equipped with an interlock, which
shall disconnect the power when the gate is opened and require manual re-actuation of a
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