Before I or anyone else go too deep into
Grounding the following basics need to be called out and understood. As I truly believe this forum and many others are meant to ask questions, share knowledge, and experiences.
- Conductor: Anything that can conduct is called a conductor and this can be anything from a rock, tree, human, and obvious metals. Anything that doesn't conduct electricity is called an insulator think rubber.
- Antenna: Anything that exceeds 25 feet will literally become an antenna. This allows something to send / receive RFI, EMI, EMF (Induced Voltage).
- Shielding: Things are shielded to absorb, reduce, reflect, and protect X from RFI, EMI, EMF. Shielding will spread and dissipate whatever while also depending upon the type of shielding draw away the RFI, EMI, EMF.
- Grounding: There are all types of ground from chassis ground, ground reference, safety ground, earth ground, component ground, etc. As it relates to a home / business the ground is intended for two purposes which is fault voltage and protection for human / equipment / structures. In the ideal world ground would be zero Ohms but that isn't ever possible in the world because everything around us has resistance.
So our primary goal is to reduce the resistance and the
Potential Difference from one point to the next. Hence the importance of everything connected to a single point Earth ground within the super structure of the homes electrical panel. When everything is connected, bonded, to the same ground reference the potential will (ideally) be the same.
- Lightning: As it relates to lightning there are two distinct solutions and paths to follow even though they seem to be related in some way. As on a
Global level they are but it doesn't change the fact the two are completely different. For a moment I'm going to go into a related tangent because it needs to be discussed because its not something the average Joe knows, understands, or considers.
Since the age of man we know lightning normally strikes the tallest structures / things. We know lightning normally will flow to what has the least amount of resistance. We know lightning carries the huge amount of voltage (power) and current and the same has the ability to damage and destroy whatever it strikes.
Lightning rods and lightning dissipaters have been used for decades because they are proven to work. People often like to compare a Telco tower to a home and this is completely wrong and ass backwards. One can not compare a completely metal tower to a stick home.
The obvious difference is the potential difference and the material that has or lacks resistance!
Any metal structure is going to conduct electricity better than a wood framed home. As such even if (Man) did absolutely nothing like SPD / Dedicated Grounding. Said tower would be more than likely fine because the tower is literally metal and is secured to the ground! We ground the tower because its not just a tower but houses electronics which are essentially small to big resistors that wont and can't last if lightning was to strike.
So man connects / bonds the electronics to the same metal tower. He than connects a dedicated ground wire that goes directly into Earth Ground.
Why???
Because no matter how conductive the tower is it has resistance and it doesn't compare to a copper wire that is connected to the Earth!
So in the opposite man said this is kind of ass backwards where we have done all of these things to react to Lightning! How about we do something to prevent or reduce the incidence of Lightning?!?!
Hence the birth and adoption of metal spikes, balls, and brush style dissipaters. All these things do is remove the positive / negative charged ions in the air. If there is less of these in the immediate area electricity literally won't be directed to that area / path.
So what did man just do here???
He literally prevented Lightning from being attracted in a specific area . . . Man hedges his bets by also incorporating proper Earth grounding and the use of SPD's.
Why??
Because the Earth is huge and its near impossible to fight Mother Nature and moving ions.
Now, as it relates to your image you provided up above you'll quickly note they call out what kind of Ethernet cable??? Shielded cable and everything else that comes into the building as being optional or using both. As stated earlier in the other thread if the most basics are not in place you're just buying time and
Sometimes you win, sometimes you lose!
You'll note my first comment about an antenna (25 feet). Your intended span is hundreds of feet and that is absolutely going to be a massive antenna.
Regardless, here are some things to consider as you walk down this path. As it relates to shielding the ground is a OK form of shielding and thus this is why Man dug caves and tunnels into the ground. The deeper you go and more soil that covers something this helps protect X from Y.
The most basic principle is deeper the trench is its less likely to be struck by someone from above. Hence digging deeper and why all utilities are literally 6 - 12 feet in the ground for water, gas, electricity. Going deeper also provides a measure of stable temperature (frost line) and hence why you see or don't see conduit filled with water via condensation.
When a conduit is only 12" in the ground no matter how sealed the pipe is its going to sweat and moisture will build up inside hence water. You dig deeper where the ground is warmer (longer) past the frost line say 24 ~ 48" the warmer ground will have less temperature differential and thus less sweat!
Again, as you go deeper past 24" the soil will provide a measure of protection from EMF.
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Your Questions:
- Grounding SPD: You literally have no ground reference leading back into the home besides the negative wire from the Ethernet cable. You're not using shielded cable which offers a ground drain wire inside the cable. You don't have a shielded RJ45 connector either connected to said shielded cable so there's no shielding / ground.
It's probably safe to say you don't have any of your equipment bonded to the service panels earth ground wire via a ground bar. Using a SPD will still offer some form of protection as some use MOV, GDT, Avalanche Diode, to complicated RLC networks with transformers, SSR's.
The SPD will essentially absorb whatever it can and than explode. The purpose of the ground is shunt to ground anything else the SPD couldn't. To be clear all SPD's are sacrificial in nature and design and it doesn't matter what the engineer uses the soul purpose of the components is to absorb the energy to protect the connected load. Once the SPD has done that part it than passes (let through) the over voltage it can't handle.
Why??
Because if it didn't there would be a spectacular explosion and ensuing fire . . .
This is why man designed and built various things to protect Human & Things.
Regardless of all the above hub bub the pressing matter is power & data. As
@sebastiantombs stated early on take a 1000 foot role of wire and terminate both ends. Hook up the same to a single camera and let it run and see what you get. Assuming you see anything do exactly what you intend to do and add in those POE extenders from Andy. Hook everything up in your kitchen and to the two other cameras.
What happens?? What do you see?
Doing all of this simply affirms what is going to happen even before you break ground. None of this even addresses the massive antenna you will have there . . .
I'm assuming that only makes things worse haha.
