Neutral Bar Clearance, 13.8kV Generator

[doehl1]

Anyone know what the clearance requirements are for a 15kV (13.8kV nom) generator neutral bar? This is the neutral bar within the generator terminal box and would typically have leads T2, T4, T6 landed on it.
Is there any code requirement or industry standard I could refer to? Live phase conductor clearances are clear and available in numerous codes, but not sure about the neutral side.
Nominal current of generator would be ~300A at 13.8kV.

 

[doehl1]

Correction, T4, T5 & T6 for neutral connection leads from generator stator.

 

[cranky108]

How is the generator grounded? That might set how you define the clearances.

For a high impedance ground, you might want the same as phase clearance.

 

[RRaghunath]

Yes, neutral bar clearance shall be same as that for phase busbar as this size machine is likely to have high resistance grounding.