What term best describes components that are surface-mounted or behind access panels for access?

The term that best describes components that are surface-mounted or behind access panels, allowing for ease of access, is "accessible." This designation is important in fire alarm systems and other electrical installations because it implies that the components can be reached without excessive effort or specialized tools, facilitating maintenance and troubleshooting.

In the context of fire alarm systems, accessibility is crucial for ensuring that technicians can regularly check, maintain, and upgrade the equipment as necessary to guarantee reliable operation during emergencies. Therefore, the components being described should be mounted or placed in a manner that allows for straightforward access.

The other terms do not capture this specific context. "Exposed" typically refers to components that are visible and not protected, which does not necessarily indicate ease of access. "Uncover" implies removing a covering, which does not define the state of the components themselves. "Concealed" suggests that components are hidden or not visible, which contradicts the notion of easy access intended by the question.