The ugly truth is most sign buyers pick certifications like they're toppings on a pizza. They ask for "UL" because a competitor mentioned it, and then pay triple for the privilege. That's not engineering. That's guessing.
I've seen this go wrong: a shop in Ohio ordered a custom sign with "ETL" written on the spec sheet, and the local inspector laughed. The ETL mark on the LED modules didn't certify the whole assembly. The sign failed inspection. They started over. That's a $4,000 mistake.
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