What is the threshold percentage of oxygen that designates an oxygen-deficient atmosphere?

An oxygen-deficient atmosphere is defined as having an oxygen concentration below a certain threshold that poses a risk to human health and safety. The recognized threshold for an oxygen-deficient atmosphere is 19.5%. At this level, individuals may experience symptoms of hypoxia, which can lead to impaired judgment, decreased coordination, and potentially life-threatening conditions.

A concentration below this level indicates that there is insufficient oxygen for normal respiratory function, making it crucial for safety protocols to be in place when working in environments where the oxygen level could drop. Therefore, recognizing 19.5% as the threshold is vital for ensuring the safety of electricians and other workers in potentially hazardous settings.