Safety Center · MobileCrane.org
Every Lift Comes Down Safely, Or Not At All
The rules, clearances, signals, and checks behind compliant crane work — OSHA and ASME requirements translated into plain language for operators, riggers, and the contractors who hire them. Lifting content on this page follows current 29 CFR 1926 Subpart CC and ASME B30.5 guidance.
20ft
Default Power Line Clearance
75%
Critical Lift Threshold
12
Core Hand Signals
10
Pre-Lift Checks
The Rulebook
OSHA Basics Every Crane Job Follows
The six requirements that apply to virtually every mobile crane operating in US construction — and where each one comes from.
29 CFR 1926.1427
Operator Certification
Operators of most cranes over 2,000 lbs capacity must be certified by an accredited body (NCCCO or equivalent) — and employers must separately evaluate and document competence on the specific machine being run.
29 CFR 1926.1412
Inspections
Cranes require a shift (daily) inspection by a competent person, a monthly documented inspection, and a comprehensive annual inspection by a qualified person. Records are kept and produced on request.
29 CFR 1926.1428
Signal Person Qualification
Whenever the operator’s view is obstructed, a qualified signal person is required — evaluated and documented on standard hand signals, radio procedure, and crane limitations.
29 CFR 1926.1407–1411
Power Line Safety
Work near energized lines follows the 20 ft default rule with defined options to reduce to Table A distances — dedicated spotter, proximity alarm, range limiter, or insulating link.
29 CFR 1926.1402
Ground Conditions
The controlling entity (usually the GC) must provide firm, drained, graded ground and notify the crane crew of known underground hazards — vaults, utilities, voids — under the setup area.
ASME B30.5
The Consensus Standard
ASME B30.5 covers mobile crane construction, inspection criteria, wire rope retirement, and operating practice. OSHA enforces the law; B30.5 defines good practice — professional operations follow both.
Deadly Serious
Power Line Clearances
Minimum approach distances from any part of the crane or load to energized power lines — per OSHA 1926.1408 Table A.
| Line Voltage (Phase to Phase) | Minimum Clearance |
|---|---|
| Up to 50 kV | 10 ft |
| Over 50 to 200 kV | 15 ft |
| Over 200 to 350 kV | 20 ft |
| Over 350 to 500 kV | 25 ft |
| Over 500 to 750 kV | 35 ft |
| Over 750 to 1,000 kV | 45 ft |
| Over 1,000 kV | As established by utility/engineer |
The 20-foot rule: Table A distances only apply after you’ve confirmed the actual line voltage. If voltage is unknown, OSHA’s default is to stay at least 20 ft away — or de-energize and ground the line. When in doubt, treat every line as live: electrocution remains one of the leading causes of crane fatalities.
One Crane, One Signal Person
The 12 Core Hand Signals
Standard crane signals per ASME B30.5 — the visual language of every lift. Diagrams are simplified; only a qualified signal person may direct a crane. The one exception: anyone can give an emergency stop.
Hoist
Forearm vertical, index finger up, hand moves in a small circle
Lower
Arm extended down, index finger pointing down, hand circles
Boom Up
Arm extended horizontally, fingers closed, thumb pointing up
Boom Down
Arm extended horizontally, fingers closed, thumb pointing down
Swing
Arm extended, index finger points the direction of boom swing
Stop
Arm extended, palm down, arm swings back and forth horizontally
Emergency Stop
Both arms extended, palms down, both swing horizontally — anyone may give it
Dog Everything
Hands clasped in front of body — pause all crane functions and hold
Extend Boom
Both fists in front of body, thumbs pointing outward
Retract Boom
Both fists in front of body, thumbs pointing at each other
Hoist Slowly
Hoist signal with other hand held motionless above the moving hand
Travel
Arm extended forward, hand open and raised, pushing motion in travel direction
When The Paperwork Gets Real
What Makes A Lift “Critical”
Any one of these four triggers means a documented, engineered lift plan and a pre-lift meeting — not just a good operator having a careful day.
01
Over 75% Of Chart Capacity
The industry-standard threshold. Above 75% of rated capacity in the working configuration, safety margins thin out and small errors in load weight or radius become large ones. Verified weights and calculated rigging are mandatory.
02
Multi-Crane (Tandem) Picks
Two cranes sharing one load — vessel settings, long column tailing, bridge girders. Load share shifts constantly as geometry changes; each crane’s share must be calculated, not assumed, with one lift director controlling both.
03
Lifts Over Occupied Areas
Loads traveling over occupied buildings, active roadways, or live process equipment. The plan defines the load path, exclusion zones, and timing — often nights or shutdowns — because a dropped load must have nowhere to land but clear ground.
04
Proximity To Power Lines
Any lift inside the Table A envelope planning zone. Requires the 1926.1408 decision process: confirm voltage, attempt de-energization, then apply encroachment prevention measures — spotter, alarms, range limits, insulating links.
Free Tool · Tap To Check
The 10-Point Pre-Lift Checklist
Run this before every pick. Tap each item as you verify it — your progress saves in this browser so the list is ready at the next lift.
0/10
Load Weight Verified
From drawings, shipping docs, or scales — never estimated by eye
Load Chart Checked
Capacity confirmed at actual radius, boom length, and configuration
Ground & Cribbing Confirmed
Firm, level, drained; pads/mats sized to bearing pressure; no voids below
Outriggers Fully Set
Extended per chart configuration, tires clear, crane level within tolerance
Rigging Inspected & Rated
Slings, shackles, hooks tagged and rated for load, angles accounted for
Power Line Clearance Planned
Lines identified, voltage confirmed, Table A distances or 20 ft default applied
Signal Person Assigned
One qualified signal person, communication method agreed and tested
Swing Radius Barricaded
Counterweight swing zone marked off; tag lines on the load, not hands
Weather & Wind Checked
Wind inside manufacturer limits for the load; forecast reviewed for the window
Daily Inspection Done
Shift inspection complete — A2B tested, LMI self-test passed, no leaks
Cleared For The Lift
All 10 checks verified. Rig it right, lift it once.
Educational reference — follows OSHA 1926 Subpart CC & ASME B30.5. Your site’s lift plan governs.
Safety Comes Standard
Got A Safety Question We Haven’t Covered?
Ask about a regulation, flag something that needs updating, or suggest the next safety guide. When OSHA or ASME guidance changes, this page gets updated.
