Some types of PPE are simply not appropriate for use in certain situations. For instance, let's say you have maintenance employees working in a shop area where they have been assigned to wear ANSI-approved safety glasses with side shields for protection against flying particles generated at various grinding machines. One of these employees is called away to work in a treating area where dip tanks are located. Assigned PPE in the treating area consists of chemical-protective splash goggles. If your maintenance employee entered the treating area wearing his safety glasses, his eyes would be potentially exposed.
