| A | B |
|---|
| Extension ladder | A ladder made of two straight ladders that are connected so that the overall length can be adjusted. |
| Flammable | Capable of easily igniting and rapidly burning; used to describe a fuel with a flash point below 100°F. |
| Flash | A sudden bright light associated with starting up a welding torch |
| Flash burn | The damage that can be done to eyes after even brief exposure to ultraviolet light from arc welding. A flash burn requires medical attention. |
| Flash goggles | Eye protective equipment worn during welding operations. |
| Flash point | The temperature at which fuel gives off enough gases (vapors) to burn. |
| Ground | The conducting connection between electrical equipment or an electrical circuit and the earth. |
| Guarded | Enclosed, fenced, covered, or otherwise protected by barriers, rails, covers, or platforms to prevent dangerous contact. |
| Hand line | A line attached to a tool or object so a worker can pull it up after climbing a ladder or scaffold. |
| Hazard Communication Standard (HazCom) | The Occupational Safety and Health Administration standard that requires contractors to educate employees about hazardous chemicals on the job site and how to work with them safely. |
