Follow-POST "SPD, hazardous installations? The CEI 81-10 does not exhaust the problem, 1.
not only the rules of installation of the SPD are complicated and poorly understood, but the indications we received from authoritative sources can be in contradiction with each other.
For example in the manual of a major company, we prefer not to mention, just a little 'dated, we read: " Surge protection devices must be appropriate to repeat the paintings derivatives, especially away from the first protection more than 30-40 m . In
a valuable text signed by GB and G. The Piparo Carrescia, titled Over voltage protection (ed. Tuttonormel - TO) we read "The low voltage equipment are always subjected to a voltage at least double the level of effective protection Up / f from which the SPD should be protected, unless the SPD is not installed within a few meters from the terminals of the equipment .
Are we not to have understood the problem?
How can we reconcile the two statements so different?
How can we defend ourselves from these events?
What do the CEI? We will try to respond when we find a little 'time to do so.
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