Here are my questions, read-on for details/ background:
Is it ok to hook up multiple grounds from multiple circuits together, in a junction box(rather than the panel)?
If I do this should I increase the size of the main ground wire running from the junction box to my panel?
My house is wired with NM cable w/ no ground (Mid 70's).
I have no ground wires, except in the areas that have been re-modled. (Kitchen, bath, garage.)
The previous owner (without a permit, but with the help of my retired electrician next door neighbor), upgraded to a 200amp panel, and started doing a whole house re-wire. I do have a lot of room in the box.
I have no plans to re-model except for changing out some light fixtures.
I have great attic acess.
I want to know can I run one ground wire from my panel to a junction box in the attic, then run ground wires to outlets from there or would I have to run a seperate ground wire to the panel for each circuit?
Please don't include things about GFCI installations in your reply's I know all about that acceptable solution.
Cables for the 70 had grounds. I find it very odd that you have NM from the 70 with no ground.
A single common ground can be used. It needs to be sized to the largest circuit using the ground. EX if connecting 15,20 & 30 amp circuits to the common ground the common must be #10 for the 30 amp circuit.