I will be connecting into the existing meter to the house for the new separate garage (with upper hobby room) 125 amp breaker box. I have run 2 #2 THHN, 1 #4 THHN, and 1 #6 bare copper from the meter to the new garage panel. So the #2's will go to breaker cutoffs, and #4 will go to neutral bar. Where does the #6 bare copper attach to the new breaker box? Do I also need another bare copper attached to the breaker box frame and down to a ground bar on the outside of the garage?

I have been replacing the beige switches and outlets in my home in favor of new, bright white units. I have replaced all in the living room with no problems but am faced with a troublesome outlet. 1/2 is connected to a light switch and when I exactly duplicate the wiring configuration, strange things happen. The block has six wires total: 3 white, 3 black. I connected them as was done on the old switch and broke the brass tab connecting the two brass connectors (not the silver finish used for white wires). Yet, when I turn the power back on, the breaker in the bathroom trips and some of the power in the upstairs master is dead. Please, if you have any advice, let me know what you'd recommend. Thank you.