How to tap a parallel feeder

[Tank11]

Example scenario: 600-amp main service so parallel feeder conductors. Want to line side tap a PV inverter (10 KW in this example). Since there are parallel conductors to tap, is the best method to provide a parallel path from the PV inverter as well for continuity across the service feeder?
Or does it not matter, and just tap one of the two parallel feeds?

 

[charlie b]

Or does it not matter, and just tap one of the two parallel feeds?

It matters!

If you tap one conductor from a set of parallel conductors, you must install identical taps on all other conductors in the set.

A key requirement of successfully parallelling conductors is that each conductor in the set must have the same loading conditions.

 

[augie47]

I believe it was in the 2020 NEC that wording was added to 300.3 to clarify that requirement.