Electrical – Undersized grounding

electrical-panel

Does an undersized grounding is cause for concern about improper / unsafe condition(s) that I noted at the house’ s electrical sub panel.
The House that was built in late 1950’s, Southern California, However, The original main panel was replaced with 125A, which supply central HVAC / 50A and sub panel / 60A. All branch wiring, including 30A sub, is fed into the aforementioned 60A sub panel. Grounding to the main panel is done via rod and connection to a water-supply metal piping.
The concerns are;
Undersized ground conduit from the main to the sub panel, not #6.
The lack of proper ground from the 60A sub panel to the 30A sub, laundry.
House’ s receptacles are a combination of 2 and 3 prongs.
Do I need to upgrade the ground’ s conduit from the main panel to the sub panel / 60A? Is the 30A sub panel wiring of concern?
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Best Answer

The main panel appears to have a nice fat braided ground on the ground rod.

For the 60A subpanel and 50A A/C service, a 10 AWG ground wire is perfectly adequate. Not seeing the problem.

The 30A sub is a Zinsco, which some very serious fire-starting problems with its buses, which can't be fixed by swapping breakers. Since it appears to be configured as a disconnect switch anyway, maybe you can replace it with that.

I could do without the artiste "runt"-ing off all the wires to barely long enough to go where they're going right now. You'll hate that guy if you ever have to put in GFCI or AFCI.

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