I came across a powerpoint slide presentation for electrical design of water pump stations that had a simple bullet statement indicating "For outdoor locations shield panels from sun and heat".
It didn't elaborate on what this is. Has anyone ever come across this?
If I can recall the dry type transformer manufacturer that I had once worked for had an option such as this for encapsulated NEMA 3R transformers which basically consists of a second top attached over the first with an airspace in between, sun shield? The top above takes the brunt of the sun's heat, the air space allows that heating to be dicipated before it can get to the actual enclosure.
I have never seen this modification as applied to a panel board or switchboard though but can't see why it can't be done.
Remember that some of the specs that you run across may not be of the real world so please don't be intimidated. If you suspect something unusual what I do is to to ask for a catalog reference as example, I.e. where did they get the idea from. It may even be your opportunity to provide something your competitors may not be able to provide by your thinking oit see ide the box and adding a modification that is nonstandard. Part of the fun is outsmarting the competition. By working with your customers making it easy to business with you is a good thing. When you quote, quote it as a package including the cost of the modification. Don't break it out as a deduction or use it as an adder unless you are pressed to do so. Your goal is to get the job.
And it is imperative to go through a drawing approval process to assure that the customer has approved what you are intending to supply.