Notwithstanding that high voltage gear isn't useful to introduce in the plenum spaces in light of temperature clearly. On the off chance that a little start happens the hardware will get fire because of crisp go of oxygen.
In USA, the coat of plenum links are tried under the expert of the National Fire Protection Association standard NFPA 90A (Standard for the Installation of Air Conditioning and Ventilating Systems).
Plenum links are secured with a heat proof plastic coat of a low smoke polyvinyl chloride (PVC).
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