impianto a terra

[ws770]

Io, NO, non ho problemi... Almeno non qui su e/o con il forum... Niente che non si può risolvere con un ciao-ciao, e un File/Quit

Ho riportato la parte del testo da te ripetuto e meglio spiegato, perché più in su si faceva riferimento esplicito a pezzi in ottone o inox. Solo per dare lo spunto a leggere... Che i testi accessibili anche senza uscire di casa sono molti, e autorevoli...

9.3.1
....
Brass is a generic name for an alloy of copper and zinc. Like other brasses, both Admiralty brass and manganese bronze have a high zinc content and should be avoided as materials for the manufacture of skin fittings or any associated valves.
Stainless steel is again a generic name for a wide range of alloys. For marine purposes, only those which have an austenitic grain structure should be used which basically means those containing around 18% chromium and 8-10% nickel, sometimes with other minor but important constituents such as titanium or molybdenum, used to prevent weld decay in fabricated components.
All such stainless steels rely on access to oxygen to maintain a layer of chromic oxide that prevents corrosion. Therefore such steels should not be used under water where there is no water flow, eg under the heads of bolts or screws and in such cases will result in at least pitting if not a risk to the integrity of the hull.
...

Da: .
BMEA CODE OF PRACTICE for Electrical and Electronic Installations in Small Craft
Incorporating BMF guidelines for The Recreational Craft Directive
Fourth Edition (supersedes Third Edition)

Saluti, Walter

PS. Io le fonti le cito, sarà un'abitudine 'da scienziato'?