PE (Electrical), NABCEP certified
- Austin, TX, USA
- Electrical Engineer - Photovoltaic Systems
Even when and where it was "mandatory" most PV integrators I knew ignored 690.47(D). I only encountered a single inspector who held our feet to the fire and made us install a ground rod for a roof mounted array. We appealed to his boss, who was much younger than him, and she told us that she agreed with us but she wasn't going to overrule him.NEC 690.47(D) has been a problem child since it was put in the NEC. There was never a reasonable reason for it and in 2017 it was made optional and is pretty much ignored now. But under the 2008 NEC it is mandatory.