What should exposed conductive guards or conduits containing supply conductors always be?

Exposed conductive guards or conduits that contain supply conductors should always be grounded to ensure safety and prevent electrical shock hazards. Grounding provides a path for electrical current to flow safely to the ground in case of a fault or insulation failure, thus protecting individuals and equipment from electric shock. By grounding these components, any leakage current is directed away from personnel and equipment, reducing the risk of serious electrical incidents.

Insulation is important for certain applications, but it does not provide the same level of protection as grounding does in the context of exposed conductive materials. Painting does not contribute to electrical safety in this scenario, and leaving conductive guards or conduits exposed would create an unsafe environment. Therefore, grounding is essential for exposed conductive guards or conduits that contain supply conductors.