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I have a 1940's house. Modern panel and sub panel feeding cloth clad cable and knob and tube. Very hard to access crawl space or inside wall because wood ship lap over skip sheathing, shingles over skip sheathing outside. I wish to add grounds to a couple outlets near the panel and am happy to see the code now allows this. (I did it earlier with a green thnn, exposed, to ground rod, and know this is not right.)

I see "bare armored ground" cable suggested, and see this was used at both main and sub panel here. The only cable I can find on the net has monster conductor... like gauge 2,4,6... crazy big. The existing panels use an armored cable 1/2" at main. 1/4" at sub, with a conductor that looks to be about 12gauge max.

Can I find something like this? Should I just buy 1/2" armored cable and pull the white and black wires out? Will this type of solution be any better if routed into the panel and bus bar or (as appears from the code) just as good attached properly to ground rod?

  • Maybe add a few pictures. – JACK Jan 24 at 20:07
  • Sorry to complicate. Where can I find armored ground in gauges thinner than say #8? All I see are industrial app. gauges like #6... – idy Jan 24 at 21:42
  • What are you trying to run the ground wires for these receptacles to? – ThreePhaseEel Jan 25 at 1:36
  • Maybe three seperate outlets, computer and sound system, presently one has bonding clamp to the ground rod next to subpanel. The three outlets are seperate circuits, two including knob and tube, one is newer to a single outlet originally for AC. – idy Jan 25 at 2:23
  • I take it that ground rod is connected to the subpanel via a grounding electrode conductor? (usually a bare copper wire, sometimes green) – ThreePhaseEel Jan 27 at 4:58

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