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.
UL Certifies/Lists energy storage systems for use in accordance with new Article 706 in the 2017 NEC. UL Certifies/Lists these systems under the product category Energy Storage Systems and Equipment (FTBW).