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I'm adding circuits to a subpanel. For wiring neatness sake, I'm considering adding a second ground bus bar. Do I need to tie both ground bars together (if so, what size wire), or is screwing them to the panel enclosure sufficient?

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Depends, are we dealing with NEC, or Harper (that's me)'s Law?

NEC: The screws attaching the ground bar to the panel are fine if they are 32 thread pitch or finer (e.g. 8-32, 10-32, etc.)

I would also run a ground wire with the thickest wire you have on hand.

  • Another law??? OMG. + – JACK Jan 6 at 19:13
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They should be properly linked.

Do not rely on the panel providing a reliable connection.

  • What is "properly linked" tho? Jumper wire from bar to bar? What size wire? Do you need some special clip, etc... – JPhi1618 Jan 6 at 16:51
  • @JPhi1618 size would depend on the size of the subpanel - so if you have that information... – Solar Mike Jan 6 at 17:00

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