Protective earth

A rare-earth-exchanged zeolite increases hydrogen transfer reactions. In simple terms, rare earth forms bridges between two to three acid sites in the catalyst framework. In doing so, the rare earth protects... 

Transformer rectifiers must be adequately protected from the elements. If they are sited outside they are usually in steel enclosures (suitably corrosion protected ) with adequate ventilation and protection against vandalism or other damage. They often incorporate lightning arrestors and other protection for the public and the inspector of the system, with suitable fusing and earth protection. 

State the purpose of earthing and earth protection. What do we do to... 

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