Abstract: An electrical assembly including a grounding mechanism and an electrical device, the grounding mechanism including a support longitudinal member and a switch contact member, the switch contact member arranged in or on the support longitudinal member, the switch contact member configured to be connected in use to ground, the electrical device including an electrical terminal, wherein the support longitudinal member is configured to be slidable between: a first position in which the switch contact member is separated from the electrical terminal so that the switch contact member is electrically disconnected from the electrical device and a second position in which the switch contact member is in contact with the electrical terminal so that the switch contact member is electrically connected to the electrical device.

Abstract: A propulsion apparatus (20) which can be mounted to a wheel (8) (or integrally formed therewith) of a vehicle, for example a wheelchair. The propulsion apparatus (20) has a first portion which can be statically attached to either a rim of the wheel (8) or structural member which is rigidly attached to the wheel (8) projects therefrom. The propulsion apparatus (20) also has a second portion (23), which is pivotal about the rotational axis of the wheel (8). Furthermore, the propulsion apparatus (20) comprises coupling means which are interposed between the first and second portions so that when the second portion (23) is rotated about the axis of the wheel (8) it causes the first portion, and therefore also the wheel (8), to rotate.