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> ... the working assumption for this thread (at least for most of us) is > that the lightning induced surge entered the system through the Ethernet cables. So a surge enters on a phone line that already has surge protection installed (for free)? Or enters on a cable that already has surge...

> My main electrical earth ... is far to the point of surge protector. Again, a protector does not do protection. Grasp that critically important fact. The protector does not do protection. By wire or by protector, what is the connection to earth? A surge is incoming on AC utility...

> Do you think that I should have a separate dedicated earthing for the surge protector? An important expression is 'single point earth ground'. Grounds for every incoming wire must be to a common earthing system. All incoming wires or their surge protectors must connect low impedance to...

Because surge protection cannot work for direct strikes, then your town is without phone service for four days while they replace that $multi-million switching computer? Since a CO will suffer about 100 surges with each storm, this damage must happen frequently. Or read papers even in 1950s...

Some examples of ethernet protectors: http://www.ditekcorp.com/product-details.asp?ProdKey=59 http://www.tripplite.com/en/products/model.cfm?txtModelID=151 Ethernet has eight wires. Each wire connects to a ground stud or ground wire via a protector. The protector only works when the ground...

Your situation is no different than what every telco switching station must solve. First some basic concepts. Your NIC already has significant protection typically rated about 2000 volts. It is damaged because a transient current is incoming (ie via a buried wire) and outgoing via some other...

Posts from magoo2 and ighrist discuss your likely problem. Notice variation occurs on all three voltages simultaneously. That implies no one wire in your building or no one load is causing problems. Implies the common power source (transformer or utility wires) is undersized for the load...

If claiming a dimming incandescent bulb is a spike, then they are laughing at you - not taking you seriously. View your numbers. No spike exists. So nobody will take you seriously. Voltage has dropped 9% from what it must be. Voltages dropping more than 5% are harmful to electric motors...

Grinc - stated previously were requirements such as longitudinal verse transverse currents that must be considered. As some noted, switching spikes and lightning spikes are similar - require same protection. And again, unless you define where both leads of a protector are connected, then...

This sentence still applies and is unanswered: The NTC (thermistor) is installed so that you do not have a massive power on current surge. Why is it not doing its job? Bulk caps are charged through the NTC so that fuses never blow and so that the power supply is even more robust. Power...

A bus does not connect to one side of the transformer - as the diagram shows. A bus connects to at least two transformer leads. Why is the diagram confusing? Which bus wire between generator and transformer also connects to which grounds? That would not be important for discussing a grid...

The NTC (thermistor) is installed so that you do not have a massive power on current surge. Why is it not doing its job? Why do you want to add resistors or an inductor to do what the neg coeffi thermal resistor (NTC) is supposed to be doing?