Solar panelboard

[electro7]

Was wondering if the attached panelboard could be rated at 225A instead of 400A. All the breakers are for inverters except the 20A, which is for the DAS system. Let me know your thoughts.

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[jaggedben]

Since your total breakers are 240A there is no code rule that would allow it.

 

[pv_n00b]

I see people running up against this problem pretty often when trying to apply 705.12(B)(3). The sum of the PV CBs is 220A so a 225 A panelboard would be fine, but then there is that pesky load CB for something like DAS. I've seen people try to ignore that one. You have room for a 5A load CB. Does the DAS really need 20A? Can you power the DAS from another panelboard on site?

 

[wwhitney]

Can you power the DAS from another panelboard on site?

Or move the DAS supply to a separate enclosed OCPD on a tap on one of the incoming or outgoing feeders?

Cheers, Wayne

 

[Carultch]

I see people running up against this problem pretty often when trying to apply 705.12(B)(3). The sum of the PV CBs is 220A so a 225 A panelboard would be fine, but then there is that pesky load CB for something like DAS. I've seen people try to ignore that one. You have room for a 5A load CB. Does the DAS really need 20A? Can you power the DAS from another panelboard on site?

You can specify a 250A busbar. They are common in the 277/480V world.

 

[electrofelon]

You can specify a 250A busbar. They are common in the 277/480V world.

True. Not sure off hand about other brands, but for Siemens, their smallest 480 panel board will have a 250A bus.