Originally Posted by ChrisWiggles
But again, I've got probably close to $30K of electronics if you think MSRP, on these, so say $300 to protect them (well, I hope protect them) doesn't seem unreasonable to me, even if spending $20 per surge protector might achieve the same/similar degree of protection.
You read what the NIST said. How many other professionals and researchers did you read before you start ignoring sales propaganda. Every surge protection system has one component that defined the heart of that protection layer - single point earth ground.
You know about ground loops in stereos? One of the many concepts that is also required as part of the protection system. Effective protection systems use the same concept - single point earth ground. A solution that has been well proven for over 100 years. A solution routinely installed in telco switching centers, munitions dumps, cell towers, nuclear hardened radio stations, and anywhere else that damage even from direct lightning strikes cannot happen.
How many times did you ignore a nearly biblical requirement as defined by the NIST?
> A very important point to keep in mind is that your surge protector
> will work by diverting the surges to ground. The best surge
> protection in the world can be useless if grounding is not done
There is no ambiguity. That is hard fact and reality. Does the ARRL have a hidden agenda? What do they recommend for surge protection? Earthing.
Lightning strikes church steeples. Why? Lightning selects a most conductive path to earth. Wood is a good electrical conductor. But since wood is not conductive enough, then that 20,000 amps creates a large voltage. 20,000 amps times a high voltage results in massive (destructive) energy. How did Franklin avert surge damage? That 20,000 amps was connected to earth via a lighting rod and conductive wire. 20,000 amps times near zero voltage is near zero energy. No damage.
What is the word always associated with effective protection? Divert. Not stop, block, absorb, arrest, suppress, etc. Effective protectors divert, shunt, connect, conduct, clamp, or bond a surge on a low impedance connection to single point earth ground.
Energy is the concept behind effective surge protection. Where does that energy get dissipated? Not stored (which cannot happen). Not stopped (as myths promote). Where is energy dissipated? Franklin simply diverted energy harmlessly to earth. A massive surge dissipated in earth means no damage.
Where does your surge get dissipated? Do hundreds of joules in an Isobar absorb surges that are hundreds of thousands of joules? That is what Tripplite says. Do the numbers for that Surgex as provided by fuelie. His 6000 volts times 3000 amps surge (as defined by ANSI/IEEE C62.41) means a 250 joules rating. How do devices rated only to absorb hundreds of joules (only 250 joules according to fuelie's numbers) make energy from destructive surges just magically disappear?
Once a surge is permitted inside the building, energy will hunt for earth ground destructively via appliances. In every location where surge damage must never happen, a surge current (energy) must not enter the building. How does lightning strike a munitions dump so often without explosions? Your appliances suffer surges much less often. What makes more sense? Spending less money for the solution routinely used in munitions dumps. Or spending massively on the Surgex that (according to fuelie's numbers) can only absorb 250 joules.
Your telco computer - connected to overhead wires all over town - suffers about 100 surges with each thunderstorm. Even documented in the Bell System Technical Journals (which one is an engineer - therefore also provides sources). How often is your town without phone service for four days? View your local switching station. Notice, no wires connect to the building. All wires drop underground before entering. Every cable first enters an underground vault so that every wire can be connected short to earth. And so that the protector will be up to 50 meters separated from electronics. Why? Do telcos all over the world do that because they have a secret agenda?
Earthing always provides the protection. Energy must be dissipated in earth so that it does not enter the building. Even Franklin demonstrated the concept in 1752. How many would forget basic science to believe a sale brochure claim? Most.
That up to 50 meters of wire between protector and electronics increases protection. Even today, earthing is what the best protected buildings always install or upgrade.
Even AC electric struck down the street is a direct lightning strike to your appliances. All appliances contain significant protection making most transients completely irrelevant. So that protection inside every appliance is not overwhelmed, the informed consumer earths a 'whole house' protector. Again, where does that energy get dissipated?
Companies such as Tripplite, APC, Monster Cable, etc will not discuss this. Who provides effective solutions? The more responsible and well respected companies including Siemens, ABB, Intermatic, Leviton, General Electric, Keison, and Square D. An effective Cutler-Hammer 'whole house' protector sells in Lowes for less than $50. Yes, that is superior protection for about $1 per protected appliance.
Why do so many not know any of this? You demonstrate the problem. Your every post assumes protection is inside a box. Wrong. Protection is always about the thing nobody sees. And about how wires connect to that buried electrode. Why do so many preach ineffective plug-in protectors? View profit margins. The same protector circuit found in a $7 grocery store protector is sells under the Monster Cable label for $150. With profit margins so high, a majority will believe what they are told. Only a minority actually have technical knowledge or will first review manufacturer spec numbers.
Spec numbers - none are provided for the Surgex or the Isobar. Show me where the manufacturer claims protection from each type of surge - with numbers. You cannot. Neither claims protection from the typically destructive surge. They are required to provide a joules numbers to have a UL safety rating. Even that joules says ineffective protection. How many joules will it absorb? How does hundreds of joules stop surges that are hundreds of thousands of joules? At what point do you actually view the numbers rather than listen to hearsay?
Energy. It’s all about where that energy gets dissipated. Its all about what path conducts tens of thousands of amps. It all about the concepts even demonstrated by Franklin in 1752.
Do telcos have a secret agenda? Or do they want surge protection? Sun Microsystems have a secret agenda? Or do they want minimally sufficient protection for Sun Server rooms? US Air Force? IEEE Standards? British Standard BS6651? Munitions dumps? NASA? Commercial broadcast stations? In every case, protection means a short connection to single point earth ground. Protection is always about where energy gets absorbed. Protection always means transient currents do not and need not enter a building. In every case, a protector is only as effective as the component that provided protection - single point earth ground.