Basic Safety Terms 5

Front

Top rail

Back

A top-level, horizontal board required on all open sides of scaffolds and platforms more than 14 inches (36 cm) from the structure and more than 10 feet (3 m) above the ground.

Front

Trench

Back

A narrow excavation below the ground surface, generally deeper than wide, with a maximum width of 15 feet (4.6 m).

Front

Brazing

Back

A process using heat over 800°F (427°C) to melt a filler metal drawn into a connection, commonly used to join copper pipe.

Front

Welding curtain

Back

A protective screen set up around a welding operation to safeguard workers not directly involved in the operation.

Front

Accident (OSHA definition)

Back

An unplanned event resulting in personal injury and/or property damage.

Front

Wind sock

Back

A cloth cone open at both ends, mounted high to show wind direction.

Front

Chronic obstructive pulmonary disease (COPD)

Back

Lung disease causing obstruction of airflow and interfering with normal breathing; includes chronic bronchitis and emphysema.

Front

Clean rooms

Back

Rooms used for scientific research or specialized processes, with cleanliness based on particles per cubic meter.

Front

Combustible

Back

Capable of easily igniting and burning; describes fuel with a flash point at or above 100°F (38°C).