ldavisfl
Member
- Location
- Denver, CO
I am looking for any opinions on the best option for grounding a relocated Cable TV drop. The current drop is a classic scenario where the drop is near the electrical service drop. The cable runs down house surface, is grounded via an IBT on the grounding electrode conductor, and then enters house. No problems.
Trouble is, I've built a detached shop and the cable drop must move (because it's literally on the roof of the new building). The NEW drop will be on the back of the shop, and the coax cable enters the shop through the wall, runs through the walls, enters a PVC conduit passing down through the slab, runs underground in a dedicated conduit back to the original service location.
The issue here is that the new cable drop location at the shop building is not coincident with the subpanel inside the shop building where I will bond it. It's about a 22 ft run inside the walls to get a grounding conductor from the shop's subpanel to the new cable drop location.
What's the best grounding method. The options I can think of are:
(1) Put new IBT near new cable drop, run AWG6 cable through walls and bond to grounding bar in panel (about 22 ft).
(2) Put new IBT on shop exterior, near the subpanel, and then run AWG outside around to the cable drop location (about 22 ft).
(3) Put new IBT near new cable drop, run AWG6 cable over about 10 ft and bond/clamp it to the shop's second grounding electrode (about 10 ft away from IBT) which itself connects to grounding panel.
(4) Something else I haven't though of
Option 1 would be the tidiest (hidden) but 22 ft is a long run and exceeds the 20 ft required by 800.100(A)(4). Option 3 strikes me as the best. Although the run would still be effectively 22 ft from the IBT to the subpanel, it would pass by 2 grounding electrodes on the way to the sub panel.
Second question, unrelated to the above, I'd like to have the coax cable's conduit come up, turn, and enter through the sill plate into the basement. I was thinking that I would bond the coax cable back to the main panel just inside the house as it is now. The coax would be bonded twice, in other words: once where it first drops to the shed, and again where it enters the main house. Does this seem like a correct grounding solution for a coax cable that is "running though" an accessory building on its way to a 1-family dwelling? Is the second bonding even required, or possibly a bad idea?
I have attached a sketch.
Thank you,
LDavisFL
Trouble is, I've built a detached shop and the cable drop must move (because it's literally on the roof of the new building). The NEW drop will be on the back of the shop, and the coax cable enters the shop through the wall, runs through the walls, enters a PVC conduit passing down through the slab, runs underground in a dedicated conduit back to the original service location.
The issue here is that the new cable drop location at the shop building is not coincident with the subpanel inside the shop building where I will bond it. It's about a 22 ft run inside the walls to get a grounding conductor from the shop's subpanel to the new cable drop location.
What's the best grounding method. The options I can think of are:
(1) Put new IBT near new cable drop, run AWG6 cable through walls and bond to grounding bar in panel (about 22 ft).
(2) Put new IBT on shop exterior, near the subpanel, and then run AWG outside around to the cable drop location (about 22 ft).
(3) Put new IBT near new cable drop, run AWG6 cable over about 10 ft and bond/clamp it to the shop's second grounding electrode (about 10 ft away from IBT) which itself connects to grounding panel.
(4) Something else I haven't though of
Option 1 would be the tidiest (hidden) but 22 ft is a long run and exceeds the 20 ft required by 800.100(A)(4). Option 3 strikes me as the best. Although the run would still be effectively 22 ft from the IBT to the subpanel, it would pass by 2 grounding electrodes on the way to the sub panel.
Second question, unrelated to the above, I'd like to have the coax cable's conduit come up, turn, and enter through the sill plate into the basement. I was thinking that I would bond the coax cable back to the main panel just inside the house as it is now. The coax would be bonded twice, in other words: once where it first drops to the shed, and again where it enters the main house. Does this seem like a correct grounding solution for a coax cable that is "running though" an accessory building on its way to a 1-family dwelling? Is the second bonding even required, or possibly a bad idea?
I have attached a sketch.
Thank you,
LDavisFL
