1. Article 500.8(A)1 of the NEC gives manufacturers several choices to determine suitability of haz loc equipment, as follows:
1. Equipment listing or labeling (by a Nationally Recognized Testing Laboratory- NRTL), or
2. Evidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned with product evaluation, or
3. Evidence acceptable to the Authority Having Jurisdiction (AHJ) such as a manufacturer’s self-evaluation or an owner’s engineering judgment.
If i correctly understand the NEC said self evaluation, don't be necessary certification to sell a product in US market (in that case and of course it´s better certificate products), I am correct?