Service Entrance Equipment Mounting Board Covering?

paullmullen

Senior Member
Location
Wisconsin
Occupation
Electrical Engineer & Master Electrician
I am mounting the meter cabinet and disconnects for a new service to a piece of plywood to permit insulation between the entrance equipment and the wall sheathing. The picture tells the story. My question is "What are people using to treat the plywood or cover it so that it becomes maintenance free" (no painting needed in the future).

Options considered but problematic in some form:
- marine painted board. (Still needs painting in the future.)
- Stainless steel covering. (Pretty, but $$$, and and extra EGC for just the cover.)
- PVC over plywood (Nice solution, but PVC is usually not long-term UV stable)
- Aluminum (Galvanic corrosion with steel components mounted to it)
- Powder Coated something or other ($$$)

What have others done?
Screenshot 2025-11-16 195707.png
 
Cover the board in aluminum to match.
I'm concerned about galvanic corrosion (deterioration when dissimilar metals are in contact) when the steel enclosures and fasteners are in contact with an aluminum substrate. Maybe I'm over thinking it, but cursory research finds others worried about this too.
 
I'm concerned about galvanic corrosion (deterioration when dissimilar metals are in contact) when the steel enclosures and fasteners are in contact with an aluminum substrate. Maybe I'm over thinking it, but cursory research finds others worried about this too.
Commonly done all the time around here. Even with vinyl siding replacing aluminum almost exclusively, the boards still get wrapped with aluminum, usually done by the sheet metal sub hired to do the soffits and fascias. I’ve not noticed signs of corrosion, but I can’t say I’ve really looked for it.
 
Top