Construction Site Safety Jeopardy

This personal fall arrest component, worn on the body, spreads arrest forces across the thighs, chest and shoulders.

What is a full-body harness?

Falls, struck-by, caught-in or between, and this make up OSHA's Focus Four construction hazards.

What is electrocution?

Holes in floors and roofs must be protected by guardrails or these, which must be secured and marked.

What are covers?

The top rail of a guardrail system must be this many inches high, plus or minus 3 inches.

What is 42?

An anchorage for personal fall arrest must be able to support at least this many pounds per worker attached.

What is 5,000?

When climbing a ladder, keep this many points of contact at all times.

What is three?

For a proper angle, an extension ladder's base should be 1 foot from the wall for every this many feet of working height.

What is four?

Scaffolds must be inspected before each shift by this kind of person, trained to spot hazards and authorized to fix them.

What is a competent person?

Window washers often work from this kind of scaffold, hung by ropes from above.

What is a suspension scaffold?

Scaffold legs should rest on base plates and these wood supports, never on bricks, barrels or boxes.

What are mud sills?

The biggest danger in trenching is this, when the walls collapse and bury workers.

What is a cave-in?

Trenches this many feet deep or more need a protective system unless they are dug entirely in stable rock.

What is five?

Trenches 4 feet or deeper need a ladder or other exit within this many feet of lateral travel.

What is 25?

Excavated soil, called spoils, must be kept at least this many feet back from the trench edge.

What is two?

A trench box, which protects workers inside it rather than holding up the walls, is this kind of protective system.

What is shielding?

Before digging, US crews call this three-digit number to have underground utilities marked.

What is 811?

Portable tools on site should run through this device, which cuts power when current takes an unintended path, such as through a worker.

What is a ground-fault circuit interrupter?

Locking and tagging energy sources so equipment cannot start during work is this procedure.

What is lockout/tagout?

Equipment must generally stay at least this many feet from overhead power lines carrying up to 50 kilovolts.

What is 10?

Electricity can injure without direct contact when current jumps through the air in this explosive event.

What is an arc flash?

This high-visibility garment helps equipment operators and drivers see workers on site.

What is a safety vest?

These areas behind and beside heavy equipment, where the operator cannot see, are called this.

What are blind spots?

A person who guides an equipment operator with limited visibility using hand signals is called this.

What is a spotter?

Loose clothing and long hair can be pulled into rotating parts, so these protective covers must stay on machines.

What are guards?

The area reached by a crane's rotating counterweight must be barricaded because of this hazard zone.

What is the swing radius?

This head protection is required wherever falling objects are a hazard.

What is a hard hat?

Work boots should have this protective feature over the toes, often made of steel or composite.

What is a safety toe cap?

Grinding and cutting call for these, rated to ANSI Z87.1.

What are safety glasses?

Cutting concrete, brick and stone releases this dust, which can cause an incurable lung disease.

What is crystalline silica?

Under ANSI Z89.1, hard hats in this class are rated to protect against up to 20,000 volts.

What is Class E?