Utility interactive fuel cell system

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See snapshot below.

I have existing utility interactive fuel cell system in hospital. I have cable between the utility interactive fuel cell and the 500A breaker being replaced. Also the 500A breaker is also being replaced. The switchboard is service switchboard MLO.

What section of the NEC 2017 Article 692 would the part of the cable replaced sizing is covered? What section of the NEC 2017 Article 692 would the 500A breaker in main service switchboard covered? Would that all be covered in NEC 2017 Article 705 what section or not?

 

[don_resqcapt19]

The sizing of the breaker is a design issue based on the output of the fuel cell. Since this is a MLO service panel, this is a line side tap, so that breaker can be any size that is equal to or less than the service rating. Once you have selected a breaker, you match the conductors to the breaker like you do for most circuits.