Question

Before an employee enters a confined space, the internal atmosphere must be tested with a calibrated direct reading instrument for _________ in that order.

Option 1. Oxygen, flammable gases, toxic gases
Option 2. Toxic gases, oxygen, flammable gases
Option 3. Flammable gases, oxygen, toxic gases
Option 4. Toxic gases, flammable gases, oxygen

Answer 1

The correct order to test the gases in a confined space with a calibrated direct reading instrument is: Oxygen, flammable gases, and then toxic gases.

Step-by-step explanation:

Before an employee enters a confined space, the internal atmosphere must be tested with a calibrated direct reading instrument for Oxygen, flammable gases, and toxic gases in that order. The correct sequence is Option 1: Oxygen, flammable gases, toxic gases. This is because it is essential to ensure first that there is adequate oxygen to support life. Next is to check for the presence of flammable gases, which could lead to fires or explosions. Finally, checking for toxic gases is important as these can cause health issues or be fatal.