A device includes a cover that includes a base. The cover is configured to be positioned over a mount that couples a support structure of an electrical device to another element. The electrical device includes an energized terminal that is configured to connect to an electrical power system and a grounded terminal. The device also includes an insulating interface coupled to the base of the cover such that, when the cover is positioned over the mount, the interface contacts the support structure to substantially electrically insulate the mount. A system includes an electrical device, a support structure that holds the electrical device on the first side, a mount configured to couple the structure to another element, the mount being grounded during operation of the system, and a protective device positioned over the mount.