500 foot Run - Wire Size - Ground

[1.21 Gigawatts]

So I have 2 conduits going from House to Gate with 3 access points (boxes) between. What size ground wire would I need?

I plan on running #8 THHN, Black, Red, Blue, White. Green? For Gate, 2 GFI's and a Spare.

I also plan on running #10 THNN Black and White for future lighting circuit even though there are pillar lights there already. Might be good to have an extra lighting circuit for the future.

The conduit size from House to #1 is 1.5" for electrical, 1" for Low Voltage Cat 7.
The rest of the conduits I did 1" for electrical and 3/4" for the LV.

(Drawing not to scale (lol))

 

[1.21 Gigawatts]

or can I do #10 thhn for the ground? I feel like the answer is no since ground wire size needs to match the largest one in the boxes?

 

[infinity]

What size OCPD are you using?

 

[Elect117]

Voltage drop is going to be a consideration in the sizing here.

 

[1.21 Gigawatts]

What size OCPD are you using?

20A

 

[infinity]

20A

Then the EGC would be the same size as the ungrounded conductor or if you're qualified to decide that an increased in size EGC isn't needed.