High-Risk Activities Flashcards

When working in a confined space, what must be checked before entry?

Answer: Atmospheric testing for oxygen levels and hazardous gases

Confined spaces must be tested for oxygen deficiency, excess oxygen, and toxic or flammable gases before any worker enters.

What is the purpose of a hot work permit on a construction site?

Answer: To authorize work that could generate heat, sparks, or flame near flammable materials

A hot work permit controls activities like welding, cutting, or grinding near combustible materials to prevent fires.

Which action is required before excavating near underground services?

Answer: Obtain service drawings and use safe digging techniques to locate services

Service drawings must be obtained and safe digging practices used to avoid striking buried cables, pipes, or other utilities.

What is the maximum safe angle of repose for an unsupported excavation in average soil?

Answer: 45 degrees

In average soil conditions, excavation sides should be battered back to 45 degrees or supported to prevent collapse.

When should a worker refuse to use a mobile elevated work platform (MEWP)?

Answer: When wind speeds exceed the manufacturer's safe limit

MEWPs must not be operated in wind speeds above the manufacturer's stated limit, as strong winds can cause the platform to overturn or swing.

What does LOTO stand for in the context of high-risk construction activities?

Answer: Lockout/Tagout

Lockout/Tagout (LOTO) is a safety procedure used to isolate energy sources before maintenance or repair work on equipment.

A worker notices a scaffold has missing toe boards. What is the correct action?

Answer: Report it and do not use the scaffold until it is repaired

Missing toe boards are a defect that can allow tools or materials to fall on people below; the scaffold must be taken out of service until repaired.