What are the governing codes and standards for a DG system?

While not a complete list that covers all circumstances, here are the main codes and standards: National Electric Code (especially Articles 690 and 705), Underwriters Laboratories (UL) 1741; IEEE standards 1547, and some parts of 519. Be aware that while a particular device may have a UL 1741 listing, it does not mean that this approval for one application can be applied to another application.

For example, an inverter may be UL-listed for a single-phase application, but not necessarily for a three-phase application. Check the specifics of the UL testing before using the device for an application for which it was not designed. It is the member’s responsibility that they or anyone acting on their behalf is aware of and in compliance with all applicable codes and standards.