If you are using triplex to feed the second building you will not isolate the neutral and will be providing a new ground electrode connected to the new neutral. If you are housing livestock in the second building this is the only permissable way to do this unless a tingle voltage isolator is installed between the ground and neutral.
If you are feeding the second building with ACWU, teck90, pipe and wire then you may run a bonding conductor to the second building panel and isolate the neutral from the ground.
