What precaution must a boilermaker take while working at extreme heights?

When working at extreme heights, a boilermaker must take the precaution of preventing injury to personnel below. This is crucial because working at elevations poses risks not only to the individual working above but also to those who may be nearby on the ground or at lower levels. If tools or materials were to fall, they could seriously injure someone below, making it essential for the boilermaker to ensure that the area is secured, to use barriers, or to have personnel safely removed from the vicinity.

While preventing fatigue and wearing safety gear are important safety measures overall and contribute to the boilermaker's productivity and safety, the immediate focus when working at significant heights should be on the safety of others who might be impacted by accidental drops or disturbances caused by the work being performed.