[RE-wrenches] mixing aluminum and galvanized steel

[Jeff Yago]

For years we have used standard mounting racks like UniRac rails bolted
together with stainless-steel hardware.  On larger arrays this usually means
bolting their extruded aluminum module rails to galvanized 3" pipe supports
for ground mounted arrays.

 

We have recently received several "flags" during the engineering review
process of our design documents on state funded projects stating all bolted
connections between aluminum and galvanized steel will require neoprene
washers to prevent corrosion.

 

Any of you run into this requirement or have had any problems?  The only
issues we ever see with corrosion is mixing copper and aluminum such as
where somebody used wrong type module frame ground connectors.

 

Jeff Yago

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