Size of bond wire and ground rod/grounding for construction trailers

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TappedOut

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Two temp trailer, each with it's own 100 amp panel mounted externally. There is an existing 2" pvc feed from 200 amp panel, and this is the only way to get power for eaach panel. Total footage is 100' from source to "sub panels" mounted on outside of trailer. So the existing 2" underground pvc must be able to handle both 100 amp circuits.

Partner and I are arguing over grounding/bonding/sizing of conductors

Driven ground rod at each "sub panel" connected to ground bar at each panel?

6 #2 xhhw( 2- 120/240v circuits) to pull box, then split for each trailer, plus what size of bonding conductor or bonding conductors?

Partner says the 2" conduit to the first pullbox where they split and go to each subpanel only needs (1) #6 bond wire, then spliced and continued in each sperate conduit to each subpanel?

Correct?

TappedOut
 
You have to pull an EGC 250.32(B) from the 200A panel based on the size of the breaker in that panel that is supplying the feeder. 250.122(A)

250.122(C) also applies since more than one circuit is in the conduit. (Only need one EGC in the conduit. Tap off at a convient point at trailers.)

Drive ground rods at each trailer 250.32(A) One rod if the resistance is less than 25 ohms and two if the resistance of the first is greater than 25 ohms. 250.56 ( Basically just drive two rods at least 6 ft apart.)

A 6 AWG 250.66(A) runs between the grounding electrode and the equipment grounding terminal bar in the panel where the EGC is connected also. 250.24(A)(5)

Answer based on 2008 Code.
 
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