1.5 KiB
id, aliases, tags
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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.