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15 questions from the rigging, signals and crane basics practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Under OSHA's Table A, what is the minimum clearance from a power line energised at up to 50 kV?
A. 10 feet
Table A sets 10 feet for lines up to 50 kV, rising in steps for higher voltages. Twenty feet is the distance that triggers the power line precautions when the voltage has not been established, and 15 feet is the Table A value for over 50 kV up to 200 kV.
Reference: 29 CFR 1926.1408, Table A
Under OSHA's Table A, what is the minimum clearance from a power line energised at 230 kV?
D. 20 feet
A 230-kV line falls in the 'over 200 to 350 kV' band, which requires 20 feet. Fifteen feet applies only up to 200 kV, and 25 feet applies above 350 kV up to 500 kV.
Reference: 29 CFR 1926.1408, Table A
Before work starts, the employer must determine whether any part of the crane, load line or load could come within what distance of a power line if the crane were operated to its maximum working radius?
B. 20 feet
Twenty feet is the trigger distance for lines up to 350 kV. If any part could get that close, the employer must de-energise and ground the line, keep 20 feet away, or establish the voltage and keep the Table A clearance, with the encroachment precautions in place.
Reference: 29 CFR 1926.1408(a)(2)