Obey the following rules at all times, whether power is
cut off or not.
Move the crane away from power sources. Ensure that
no part of the crane or load comes closer than the
minimum clearances allowed below.
Get assurance that power has been turned OFF.
IMPORTANT - Always consider wire rope, hoist cable,
pendant cables, tag lines, etc. as electrical conductors.
EXERCISE EXTREME CAUTION AND PRUDENT
Comply with all federal, state, and local laws and
Remember you do not have to touch a power line or
power source to become electrocuted. Electricity can
jump from the power line into the crane. "Low" voltages
can also be dangerous.
Keep all parts of crane (ropes, hookblock and load) at
Under 50 KV
- 10 FEET
- 12 FEET
- 15 FEET
- 20 FEET
- 25 FEET
- 35 FEET
Whenever a load, wire rope, boom or any Portion of a
crane contacts or approaches too closely to an electrical
power source, everyone in, on and around the crane can
be seriously injured or killed!
THE ONLY SAFE WAY TO OPERATE A CRANE IS TO
STAY AWAY FROM ELECTRICAL SOURCES!
Appoint a signalperson, equipped with a loud signal
whistle or horn and voice communication equipment, to
warn you when any part of the crane or load is near a
power source. This person should have no other duties
while the crane is working.
Warn all personnel of danger. Keep unnecessary
personnel away from the working area. Permit no one to
lean against or touch the crane. Permit no one including
sling men or load handlers to hold load, lines or rigging
Even if you are not affected by an electrical contact,
others in the area may become seriously injured or killed.
The use of boom guards, proximity devices, insulated
hooks, links or mechanical limit stops do not assure
safety. Even if codes or regulations require use of such
devices, failure to follow rules listed here may result in
serious injury or death. You should be aware of some of
the limitations of devices.
Boom cage/guards afford limited protection from
electrocution. They are designed to cover only boom-
nose/point and a portion of the
cages/guards are limited by their physical lengths,
insulating abilities and operating conditions (e.g., dust,
dirt, moisture, etc.).
Insulating links installed into the load line afford
limited protection for those handling the load. Links have
limited lifting, insulating and other properties that affect
their performance. Moisture, dust, dirt, oils, etc. can
cause a line to conduct electricity. Due to their
capacity/ratings, some links are not effective for large
cranes and/or high voltages/currents.
The only protection afforded by a link is that which is
obtained below the link -- electrically downstream,
provided the link has been kept clean and free of
contamination and is tested prior to use for its non-