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# Feeder Sizing

> [!cite] 250.122 Size of Equipment Grounding Conductors
> **(A) General.** Copper, aluminum, or copper-clad aluminum
> equipment grounding conductors of the wire type
> shall not be smaller than shown in Table 250.122,
> but in no case shall they be required to be larger
> than the circuit conductors supplying the equipment...

Apparently in the 2026 NEC First Draft Meetings,
Code Making Panel 5 clarified that the equipment grounding conductor (EGC)
never needs to be larger than the largest ungrounded conductor in any raceway
when installed in parallel.
I can not find a source to verify this.
Statements from other reputable sources including Mike Holt
are in contradiction to this idea.

***

Given a minimum ampacity, find all valid configurations.

> [!cite] 310.10(H) Conductors in Parallel.
> **(1) General.** Aluminum, copper-clad aluminum, or copper conductors,
> for each phase, polarity, neutral, or grounded circuit
> shall be permitted to be connected in parallel
> (electrically joined at both ends)
> *only in sizes 1/0 AWG and larger*
> where installed in accordance with 310.10(H)(2) through (H)(6).

Rank by total cost of install.

## Complexity to Ignore

### Conductor Material

Tinned copper and copper-clad aluminum conductors
can be assumed out of scope.

## Complexity to Respect

Wire and EGC conductors are usually assumed to match,
but it is sometimes preferable to use a copper EGC
with high-amp aluminum parallel feeds.