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Brief description from PVC False Ceiling above :
High-voltage electrical equipment (generally regarded as being over 50 volts) is not permitted to be exposed in the plenum space above a drop ceiling. High voltage wiring must be enclosed in conduit or raceways, and must be physically isolated from low-voltage wiring. High voltage electrical devices similarly must be enclosed in a plenum space, inside a metallic container. Similarly, electrical outlets for domestic powered devices are not permitted inside the plenum space, though outlets can be installed on ceiling tiles inside electrical boxes, with the sockets exposed on the exterior bottom face of the drop ceiling. The purpose of these restrictions is to limit flame spread inside the unseen plenum space, in the event of high voltage equipment or wiring failure. Low voltage cabling is permitted because current flow is typically negligible so the risk of overheating and fire is limited.
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