10 questions, graded as you go, with the reason for every answer. No sign-up.
What this covers
Electric tool safety
Extension cords
Circular saws
Drills
Grinders
Pneumatic tools
Powder-actuated tools
Stationary saws
Saws
Power tool safety
Sample questions
A drill has a two-prong plug and a square-within-a-square symbol on its nameplate. What does this mean?
It is broken and the ground pin has been cut off
It is for use on 240-volt circuits only
It is approved for use in wet locations
It is double insulated and needs no ground pin
Show the answer
D. It is double insulated and needs no ground pin
The double-square mark shows double insulation, which is an accepted alternative to an equipment grounding conductor. It does not make the tool safe for wet locations.
Reference: 29 CFR 1926.302(a)(1)
Which is the correct way to disconnect and carry a corded tool?
Pull the cord from a distance and carry the tool by its cord
Pull the plug by its body and carry the tool by its handle
Leave it plugged in and carry it with a finger on the trigger
Pull the cord and carry the tool by its blade guard or chuck
Show the answer
B. Pull the plug by its body and carry the tool by its handle
Yanking or carrying by the cord breaks conductors and loosens the strain relief, which leads to shocks. Tools are carried by the handle, unplugged, with fingers off the switch.
Reference: 29 CFR 1926.302(a); 1926.416(e)
The ground pin has broken off an extension cord plug. What should be done with the cord?
Remove it from service until it is repaired
Use it only with tools in a dry location
Use it with an adapter on a two-slot outlet
Use it, but only on a GFCI-protected circuit
Show the answer
A. Remove it from service until it is repaired
Without the ground pin the grounding path is lost, so the cord is taken out of service and repaired or discarded. A GFCI adds protection but does not make a defective cord acceptable.
