after using the term above, thought i should look it up to be sure it was right.
Galvanic Action: Flow of electrons which occurs when two dissimilar metals come into contact in the presence of moisture which is capable of carrying electric currents, resulting in the corrosion of the more active metal, which is lower on the galvanic scale, without damage to the more passive metal.
this site also helped out some, it bascically says that the "more noble metals" like copper pipes would corrode the "less noble metal" like aluminum mc, and another interesting thing is that the type of steel makes a lot of difference on where it is on the galvanic scale [galvanized, active, or passive steel] so guess it would be good to know what the emt and mc are made of, and the presense of electrolytes, water, etc, is a big part of the answer.
http://www.roofhelp.com/galvanicscale.htm so what do ya think?
