Feeder Taps and Ground Wires

[charlie b]

65 amp breaker, #6 wires with #8 EGC, running from j-box to j-box along the ceiling. At each j-box, smaller wires are tapped and run (less than 10 feet) to a fused disconnect and then to an adjacent VAV box. For example, #12 wires to 20 amp fused disconnect. Question: what size EGC do you run with the #12s? I have my own answer, but I am looking at some plans with a different answer.

 

[jumper]

Where in the heck did you get a 65A breaker?

On to your question:

250.122(G) Feeder Taps.
Equipment grounding conductors run
with feeder taps shall not be smaller than shown in Table
250.122 based on the rating of the overcurrent device ahead
of the feeder but shall not be required to be larger than the
tap conductors,

Hmmmm. I get two different answers from one paragraph. I am gonna ignore the first one, a #8 based on T250.122 and go with a #12 based on the size of the tap conductors. Whadda ya think?

 

[dkidd]

Where in the heck did you get a 65A breaker?

On to your question:

250.122(G) Feeder Taps.
Equipment grounding conductors run
with feeder taps shall not be smaller than shown in Table
250.122 based on the rating of the overcurrent device ahead
of the feeder but shall not be required to be larger than the
tap conductors,

Hmmmm. I get two different answers from one paragraph. I am gonna ignore the first one, a #8 based on T250.122 and go with a #12 based on the size of the tap conductors. Whadda ya think?

I agree with 12AWG. There is an article at http://www.ecmag.com/section/codes-standards/sizing-equipment-grounding-conductor-tap

 

[charlie b]

Where in the heck did you get a 65A breaker?

Pigment :lol: of my imagination, perhaps? :happyyes: