I would say if you have the manufacturer's data on outdoor life expectancy of the sign as well as a maintenance inspection procedure that calls for the replacement of the signs after their life expectancy, you'll leave no room for the inspector for argument.
Originally Posted by solburden
As a practical matter the sign's life expectancy selected should not exceed the life expectancy of the equipment unless it is more cost efficient than the laternative. Ex. a SS engraved sign's life would exceed a PV cells'.
Laszlo Z Weress
Business is competition, and the ultimate competition is war. All is fair in love and war.