[250.30(A)(1)]. Zero. It must be unspliced.
[250.30(A)(2)]. The size of the derived phase
[250.30(A)(6)]. You don't ground them. You bond
them. See Article 100 definitions and 250.104(D).
[250.30 (B)(1)]. Nothing. While the language of
the NEC requires you to "ground" the equipment of an ungrounded
separately derived system, that isn't what you do. Grounding won't
help. If you read the actual requirements, you will see this is just
an incorrect word choice in the NEC and the requirement is actually
that you bond that equipment.
[250.34]. False. Grounding it won't prevent
shock. Also, the requirement to ground it exists only if the
generator fails to meet two conditions that are typical of nearly
every generator application (detailed in 250.34).