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 Feed openings for shovel, front end loader, or other manual or mechanical equipment shall be
constructed in such a way that the conveyor screw is covered by grating. If the nature of the
material is such that a grating cannot be used, then the exposed section of the conveyor is to be
guarded by a railing and there shall be warning signs posted.
15.3.13 Shuttle Conveyors, Belt Trippers, And Transfer Cars
The conveyors shall be provided with a brake, rail clamp, or other position locking device.
Means shall be provided to limit travel. Stops shall be provided beyond the normal travel limits
to stop the conveyor in case of overtravel. When the conveyors and its path are obstructed from
the view of the controlling operator, the conveyor shall have a device to warn of its movement.
Sweeps shall be provided for all moving cars, trippers, or shuttles to deflect objects ahead of
pinch points between wheels and rails. Although all nip and shear points shall be guarded, it is
not necessary to provide guards where the belt rides on the idlers. Trippers or shuttles may
discharge into silo or bunker openings, with or without seals. In either case, openings shall be
provided with grating to suit the material being handled, and the width of the openings shall not
be large enough to permit personnel to fall through. Where material size requires openings that
would permit personnel to fall through, the openings shall be protected by other means. Where
power is electrically provided via trolley or rail, these power conductors shall be guarded in such
a manner as to prevent accidental contact by personnel. In explosive areas, explosion proof
equipment and cable reels shall be used instead of trolley or rail. When an operator is required to
move with the shuttle, tripper, or transfer car, a work station shall be constructed for his
protection.
15.3.14 Skip Hoists - Bulk Materials
Limit switches shall be provided to establish limits of travel of the skip bucket. Additional
switches shall be provided to interrupt the power supply and actuate the hoist brake whenever the
skip bucket exceeds the design travel limit by a predetermined safe distance. Slack cable
switches shall be provided and so arranged that whenever the skip hoisting rope develops slack
or loses tension due to sticking in the guides, overtravel, or for any other reason, power to the
drive will be cut off and the brake will be set. Riding the skip bucket by personnel shall be
forbidden. All sheaves shall have guards to prevent the wire rope from coming off the sheaves
under a slack cable or similar condition. If the hoist unit is located in an area that is generally
accessible, then a complete wire mesh or similar guard shall be placed around the hoist. This
guard is not required when guarded by location. The following wearing parts should be regularly
and frequently inspected:
15-10
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