The NEC and UL Standards are the foundation of the work performed each day as an inspector or installer. Involvement in the standards development process allows participants to become a critical part of improving safety and also facilitates their professional growth.
Reputable manufacturers go to great effort to acquire certification to demonstrate the safety of their products. However, less reputable manufacturers may forego testing and certification, using counterfeit marks to give the illusion that their products are on par with competitive products, when in fact, they could be dangerous and of unknown quality.
The U.S. solar market is accelerating because of a growing understanding that (1) renewable energy projects are sound investments, and (2) uninterrupted power is critical to business success where utility power can fluctuate.
Wiring methods for Class I, Division 2 locations are addressed in Section 501.10(B) of the NEC. Here, in addition to those wiring methods that are permitted for Class I, Division 1 installations in Section 501.10(A), the NEC covers other wiring methods that are permitted for Class I, Division 2.
It is the responsibility of the authority having jurisdiction (AHJ) to determine whether any field modifications are significant enough to require a UL staff member to evaluate the modified product. UL can assist the AHJ in making that determination.