Hard to say, really. The NRTL reference is a little odd, as NRTL’s don’t actually specify codes. Anyway, the two UL standards to look at are: UL130 (Electric Heating Pads) and UL 964 (Electrically Heated Bedding) I don’t know what the content is, but they were updated in 2006, so you may be right. Around 2006 there was an article published in a medical journal about Heat Stroke from electric blankets, so this may have been the impetus for the temperature reductions.