shortcircuit2
Senior Member
- Location
- South of Bawstin
In reading the 2014 Draft for 690.47 there is new wording that allows the equipment grounding conductor to be used for the ground-fault detection reference for ungrounded PV systems...
"An ac equipment grounding system shall be permitted
to be used for equipment grounding of inverters and other
equipment, and the ground-fault detection reference for ungrounded
PV systems. [ROP 4?310a]"
According to 690.45 my equipment grounding conductor is allowed to be no smaller than a #14 conductor...
690.47(B) says that..."Direct-Current Systems. If installing a dc system, a grounding electrode system shall be provided in accordance with 250.166 for grounded systems or 250.169 for ungrounded systems."
In reading 250.166 the minimum size for grounding electrode conductor is #8...
So under the new wording at the end of 690.47 for 2014 that allows the equipment grounding conductor to serve as the ground-fault detection reference for ungrounded PV systems, would the size be a minimum of #8 be required or is #14 permitted in some of the smaller systems?
"An ac equipment grounding system shall be permitted
to be used for equipment grounding of inverters and other
equipment, and the ground-fault detection reference for ungrounded
PV systems. [ROP 4?310a]"
According to 690.45 my equipment grounding conductor is allowed to be no smaller than a #14 conductor...
690.47(B) says that..."Direct-Current Systems. If installing a dc system, a grounding electrode system shall be provided in accordance with 250.166 for grounded systems or 250.169 for ungrounded systems."
In reading 250.166 the minimum size for grounding electrode conductor is #8...
So under the new wording at the end of 690.47 for 2014 that allows the equipment grounding conductor to serve as the ground-fault detection reference for ungrounded PV systems, would the size be a minimum of #8 be required or is #14 permitted in some of the smaller systems?