Key points in this article
A trade, not a maximum
Protection grade is a balance between cost and the user's experience, not a number to maximize. Paying for a grade the site never needs wastes budget. The steady view is to fit the rating to the real environment around it.
Balancing the two
Compare the site's actual dust and water exposure with the grade chosen. Over-specifying adds cost with no felt benefit; under-specifying risks failures. The front line shows most trouble came from guessing instead of measuring first properly.
Fit to the real site
Check equipment status before use. Confirm billing stopped and verify the amount. Stop and report if a cable is damaged or connector loose. Save records so any ingress can be traced and the chosen grade reviewed honestly by staff. For most sites, the real gain appears once grade is a cost-experience trade and fit the site, not the brochure become daily habits rather than afterthoughts. A small, steady effort on grade is a cost-experience trade and fit the site, not the brochure protects both users and the equipment over the long run.