A grounding block includes a conductive grounding surface configured to electrically ground a wire to a grounded structure, a retention member rotationally fixed about an axis orthogonal to the grounding surface and slidable toward and away from the conductive grounding surface in a direction parallel to the axis, and a biasing element configured to apply a first force to the retention member in the direction toward the conductive grounding surface to electrically ground the wire to the housing to satisfy a first regulatory requirement. A fastener is operative to apply a second force to the retention member in the direction toward the grounding surface to apply a mechanical load to satisfy a second regulatory requirement.