Reference
Only
SAFETY INFORMATION
2250 MAX-ER 2000 OPERATOR’S MANUAL
2-18
Published 01-08-13, Control # 049-05
the load, load line, or crane boom if it comes too close to
an electrical power source. Low voltages can also be
dangerous.
Set-Up and Operation
1.
During crane use, assume that every line is energized
(“hot” or “live”) and take necessary precautions.
2.
Position the crane such that the load, boom, or any part
of the crane and its attachments cannot be moved to
within 20 ft (6 m) of electrical power lines or equipment.
This includes the crane boom and all attachments.
Overhead lines tend to blow in the wind, so allow for
movement of the overhead lines when determining a
safe operating distance.
3.
Erect a suitable barricade to physically restrain the
crane, all attachments, and the load from entering into
an unsafe distance from electrical power lines or
equipment.
4.
Plan ahead and always plan a safe route before
traveling under power lines. A wooden clearance frame
should be constructed to ensure sufficient clearance is
maintained between crane and power lines.
5.
Appoint a reliable and qualified signal person, equipped
with a loud signal whistle or horn and voice
communication equipment, to warn the operator when
any part of the crane or load moves near a power
source. This person should have no other duties while
the crane is working.
6.
Taglines should always be made of non-conductive
materials. Any tagline that is wet or dirty can conduct
electricity.
7.
DO NOT store materials under power lines or close to
electrical power sources.
8.
When operating near transmitter/communication towers
where an electrical charge can be induced into the crane
or load:
•
The transmitter shall be deenergized OR,
•
Tests shall be made to determine if an electrical
charge will be induced into the crane or load.
•
The crane must be provided an electrical ground.
•
If taglines are used, they must be non-conductive.
•
Every precaution must be taken to dissipate
induced voltages. Consult with a qualified RF (radio
frequency) Consultant. Also refer to local, state, and
federal codes and regulations.
Electrocution Hazard Devices
1.
The use of insulated links, insulated boom cages/
guards, proximity warning devices, or mechanical limit
stops does not ensure that electrical contact will not
occur. Even if codes or regulations require the use of
such devices, failure to follow the rules in this section
may result in serious injury or death.
2.
Be aware that such devices have limitations and you
should follow the rules and precautions outlined in this
section at all times even if the crane is equipped with
these devices.
3.
Insulating links installed into the load line afford limited
protection from electrocution hazards. Links are limited
in their lifting abilities, insulating properties, and other
properties that affect their performance. Moisture, dust,
dirt, oils, and other contaminants can cause a link to
conduct electricity. Due to their capacity ratings, some
links are not effective for large cranes and/or high
voltages/currents.
4.
The only protection that may be afforded by an insulated
link is below the link (electrically downstream), provided
the link has been kept clean, free of contamination, has
not been scratched or damaged, and is periodically
tested (just before use) for its dielectric integrity.
5.
Boom cages and boom guards afford limited protection
from electrocution hazards. They are designed to cover
only the boom nose and a small portion of the boom.
Performance of boom cages and boom guards is limited
by their physical size, insulating characteristics, and
operating environment (e.g. dust, dirt, moisture, etc.).
The insulating characteristics of these devices can be
compromised if not kept clean, free of contamination,
and undamaged.
6.
Proximity sensing and warning devices are available in
different types. Some use boom point (localized)
sensors and others use full boom length sensors. No
warning may be given for components, cables, loads,
and other attachments located outside of the sensing
area. Reliance is placed upon the operator in selecting
and properly setting the sensitivity of these devices.
7.
Never rely solely on a device to protect you and your
fellow workers from danger.
Some variables you must know and understand are:
•
Proximity devices are advertised to detect the
existence of electricity and not its distance, quantity,
or magnitude.
•
Some proximity devices may detect only alternating
current (AC) and not direct current (DC).
•
Some proximity devices detect radio frequency (RF)
energy and others do not.
•
Most proximity devices simply provide a signal
(audible, visual, or both) for the operator and this
signal must not be ignored.
