The project C 999 relating to the Italian standard CEI 64-8 presented at public inquiry ending September 30, 2008 in Part 4, which deals with the requirements of safety, it gives body to the Chamber, 443, dedicated to the protection electrical installations against overvoltages of atmospheric origin or due to maneuvers. "It follows the publication of a document CENELEC HD 60364-4-443.
The new provisions dealing with practically all of the transient overvoltages transmitted by the power supply system.
The first reading is known by a some dismay that, while the standard CEI 81-10 deemed useful for the purpose of transferring the plant dangerous surge in the examination section of the dial up "to the first node that meets the new standard (IEC 64-8) did not draws this distinction and refers more to a new policy determination of the need to ensure whether or not the installation of security, that of SPD. The new policy is called "conventional" e relativo "al caso peggiore".
La situazione a nostro avviso si sta complicando moltissimo e comincia a sfuggire di mano il senso di quanto si va a prescrivere, che già con la norma vigente CEI 81-10 appariva spesso poco chiaro. Certamente tanti sono i dubbi e le domande che il nuovo testo suggerisce. Nell’immediato si chiede come mai è sparito il richiamo alla presenza del "primo nodo" della linea di alimentazione a limitare la valutazione del rischio?
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