Residential - 3 Wire 12AWG Romex on its own circuit, 20a breaker, into a metal jbox in the garage.
Garage Jbox is pigtailed to ground with incoming Romex and attached to 3 wire 12 AWG Thhn. The 3 wire Thhn exists the garage wall through EMT that is secured to the garage Jbox.
EMT Runs on outside stucco of house that enters a metal receptacle box with 20a GFCI, grounds are pigtailed to the metal box. EMT exits that GFCI box to another larger Metal R3 Jbox that is 10"x10" where it now branches off with three separate runs of EMT that dives into the dirt and transitions to PVC Schedule 40 to other lights (receptacles) in the yard. All outside EMT is connected with Water Tight Connections.
All branches will be grounded by a bus bar I will install in the metal 10" x 10" Box or grounding lug.
I believe this is a correct bonding...but
Now my confusion...
I have a floating EMT Run with two Metal boxes on the outside and one in the garage. Does that Bus bar effectively bond all the boxes and EMT together (Except the boxes out in the yard for the lights.? I believe so but what about grounding due to lightning hitting the 10x10 metal box and/or EMT on the outside of the house?
If I now attach a 6awg to the 10x10 metal jbox bus bar to send out through pvc on the bottom of the box to a ground rod that I will install. Does that 6awg wire to ground rod reduce the probability the breaker will trip from the fault by drawing too much and not flipping the breaker?
Major confusion and unable to find a good answer.
I did go over Bob Ludecke's Grounding Presentation, which is outstanding, but unable to figure out if my answer lies in there.
Garage Jbox is pigtailed to ground with incoming Romex and attached to 3 wire 12 AWG Thhn. The 3 wire Thhn exists the garage wall through EMT that is secured to the garage Jbox.
EMT Runs on outside stucco of house that enters a metal receptacle box with 20a GFCI, grounds are pigtailed to the metal box. EMT exits that GFCI box to another larger Metal R3 Jbox that is 10"x10" where it now branches off with three separate runs of EMT that dives into the dirt and transitions to PVC Schedule 40 to other lights (receptacles) in the yard. All outside EMT is connected with Water Tight Connections.
All branches will be grounded by a bus bar I will install in the metal 10" x 10" Box or grounding lug.
I believe this is a correct bonding...but
Now my confusion...
I have a floating EMT Run with two Metal boxes on the outside and one in the garage. Does that Bus bar effectively bond all the boxes and EMT together (Except the boxes out in the yard for the lights.? I believe so but what about grounding due to lightning hitting the 10x10 metal box and/or EMT on the outside of the house?
If I now attach a 6awg to the 10x10 metal jbox bus bar to send out through pvc on the bottom of the box to a ground rod that I will install. Does that 6awg wire to ground rod reduce the probability the breaker will trip from the fault by drawing too much and not flipping the breaker?
Major confusion and unable to find a good answer.
I did go over Bob Ludecke's Grounding Presentation, which is outstanding, but unable to figure out if my answer lies in there.
