Grounding of feeders in cable tray

[white stallion]

Have an installation with three feeders, each feeder is made up of three 3-500 KCMIL 2400V parallel feeders for approximate rating of 1320 Amps. The service originates at utility from three individual transformers and terminates at the medium voltage switchgear. All feeder cables are to be run in cable tray, no conduits. The question is: does each parallel cable run require its separate ground conductor rated for the full capacity of the three parallel feeders? Since there is no conduits involved, can only one ground conductor be used for all 9 - 500 KCMIL feeder?

 

[jaggedben]

A single equipment ground can be used for multiple feeders in the same raceway.

There are some confusing aspects to your post.
If you have three sets of conductors in parallel, connected at both ends, you have one feeder. If you have three separate feeders, serving separate loads, it's unnecessary to call them 'parallel', I think that's just confusing. Also why are you mentioning the service transformer and switchgear? Are the conductors you're asking about actually the service conductors? Hopefully what I said above still applies.

See 392.60 for particulars regarding cable trays and bonding.

 

[white stallion]

There are three separate loads being fed by way of the cable tray. Each load is fed with a similar type of feeder. Each feeder is composed of 3 #500 KCMIL 2400V runs. There are no conduits involved. The service conductors enter the cable tray from the source and exit cable tray onto load. My question: Is one ground wire sufficient for the 3 parallel runs on the feeder for each load?