Himanshu wrote:
I'm upgrading wiring in an older home which originally had ungrounded
two-wire fabric-sheathed cable. I replaced it with 12/2 with grounding
wire in a few circuits.
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I'm wondering, is it required to change the outlet boxes to the bigger
14 cu in (or bigger) boxes when I upgrade the wiring? That would be
much more work than I had originally anticipated.

Thank you all for your suggestions.

The local inspector said that for the end-of-the-run, I could keep the
older box, but for middle-of-the-run, I would have to install a bigger
box during the upgrade.

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Himanshu