Early 1960's home. 200-amp main service panel on first floor. 3-wire (L-L-N) feeder to 100-amp sub-panel in the second floor attic, about 25-30 feet from the main service panel.
Neutral and ground bonded at main service panel. I have 2 grounding rods on opposite sides of the house, more than 10 meters apart. One conductor connects at the service meter and the opposite conductor at the main service panel (located in middle of house).
Sub-panel does not have a grounding conductor. Neutral and ground are bonded and NOT grounded to the sub-panel box.
Am I safe? The lack of a grounding conductor from the sub-panel makes me uncomfortable.
- Leave it alone.
- Run a grounding conductor from sub-panel to the main service panel. This might be possible, but will be difficult at best. Also separate neutral and ground at sub-panel. Install ground bus bar and bond to sub-panel box. Right?
- Run a grounding conductor from sub-panel to main service panel grounding rod. Leave the rest alone. This is easier. Is it safe?