Here's what I came across the other day have a 2" emt coming out of a 480/277v panel going to a 12x12 j box, with 3/4 emt branching out and feeding 8-10 individual 480v three phase roof top units, each is just a 3 pole 15amp. So say total 30 #12 current carrying conductors with only one #12 egc. Is it stated in the code how many egc's are required per grouping of current carrying conductors?
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(C) Multiple Circuits. Where a single equipment grounding conductor is run with multiple circuits in the same raceway, cable, or cable tray, it shall be sized for the largest overcurrent device protecting conductors in the raceway, cable, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.10(B)(1)(c).
310.10(H)(5) Equipment Grounding Conductors. Where parallel equip‐ ment grounding conductors are used, they shall be sized in accordance with 250.122. Sectioned equipment grounding conductors smaller than 1/0 AWG shall be permitted in multi‐ conductor cables, if the combined circular mil area of the sectioned equipment grounding conductors in each cable complies with 250.122.
So as long as the egc is sized based on the over current device, just one egc will work with multiple circuits in conduit, no matter how many ungrounded conductors its grouped with
Yep
Based on the largest OCPD. When the EGC's branch off at the junction box, they all wirenut to the single EGC from panel
Awesome, Thank you for your help is greatly appreciated
Most Welcome