Grounding of double runs power cables

[Iphonest]

Hi,

We have a big warehouse (20,000 Sq meter) where government electricity is split into 4 different feeders in 4 different locations, To provide electricity to the warehouse we have 4 MDB for each feeder.

The connection between feeder and MDB will be double runs in parallel of 600 MCM [2(4Cx300mm^2)]. and a ground cable of 300 MCM (1Cx150mm^2).

Now my question is DO we have to use 2 runs of ground cable or one ground cable is enough?

 

[tom baker]

Does your location use the NEC?
Are your parallel runs in one racewsy or two?
Under the NEC, each raceway requires a full size EGC.
The size is based on table 250.122

 

[Iphonest]

Does your location use the NEC? No
Are your parallel runs in one racewsy or two? One cable tray.
Under the NEC, each raceway requires a full size EGC.
The size is based on table 250.122

Thank you for your reply

 

[tom baker]

My answers are based on the NEC and may not apply to your application.

 

[LarryFine]

If you're using cables or other assemblies, each one should have an EGC sized as if it was the only one.

If you have just a bundle of individual conductors, then one correctly-sized EGC is all you need.