Practice question

What safety measure is required before entering a traffic signal pull box or vault that could have a hazardous atmosphere?

Simply open the lid and enter
Test the atmosphere for oxygen deficiency, combustible gases, and toxic gases before entry
Pour water into the vault first
Wear sunscreen

Answer: B — Test the atmosphere for oxygen deficiency, combustible gases, and toxic gases before entry

The correct answer is shown above. Try the full quiz for additional practice.