What should be done before entering an excavation?

Performing an atmosphere test is crucial before entering an excavation because it ensures that the air quality is safe for workers. Excavations can pose risks such as the presence of hazardous gases or a lack of oxygen, which can lead to serious health issues or even fatalities. An atmosphere test helps identify these potential dangers by measuring the levels of oxygen, flammable gases, and toxic substances present in the air. This step is a standard safety protocol that helps protect workers and provides vital information about the working environment.

Additionally, while other options like waiting for an inspection or checking the weather can contribute to overall safety, they do not specifically address the immediate atmospheric hazards that can exist in an excavation site. Relying solely on experience is also inadequate, as it does not provide concrete data regarding the current conditions of the air. Thus, conducting an atmosphere test is the most effective way to ensure that the site is safe before anyone enters.