In a metal warehouse (similar to a Butler Building)used for boat storage, there are metal perlings running horizontaly every 4 ftabout 8in wide, MC cable strapped on top of first perling 4 ft high, is this subject to physical damage as in 334-3

I think that most people would agree that it is subject to physical damage in most cases, especially if the customer is allowed access to their vessel. I have been around these types of buildings for years, and even though they should not do it, I have seen this as a nice place for the marine battery to be stored, or other boat items.