aznsx
Flashlight Enthusiast
Both fortunately were well-designed and properly-grounded with a single grounding point
Just curious: is this also true in the case of the structure where this damage occurred?
Both fortunately were well-designed and properly-grounded with a single grounding point
There's quite a bit of EMP in lightning. Worse, it inductively couples with anything metal. I've actually lost far more equipment this way over the years than voltage surges.To my knowledge, lightening does not generate EMP, nuclear blasts do, possibly some other processes. Good thing it doesn't or electrical/electronic systems would be regularly wiped out over large areas. Risetime of real EMP is way faster than lightening, that's what gets you.
Long lengths of unshielded wire will definitely inductively couple with lightning. Down here, POE (Power over Ethernet) switches will blow individual ports often because of it. Regular network switches will as well, but the POE ones seem to do it at a much higher rate. I'm guessing the surge protection threshold has to be higher because of the 48vDC on the line. We still run ancient gear here, so the 48vDC to each port is switched by relays. I'm assuming newer network switches probably use solid state conductors for this and would be even more susceptible. HP seems the most resilient to this. Ciscos can handle higher temperatures than most, but blows ports regularly. I have some new TP-Link POE switches deployed, but haven't been through enough lightning storms to have an opinion on them yet.I'm sure that your equipment was hit by the EMP. We lost some equipment at work a couple of summers ago when a structure got hit a couple of blocks away. Our equipment was connected to long lengths of communications cabling which acted as an antenna for the EMP.
The electrical system at my temporary place is...okay... It was redone in 2012 when they ripped out the all-aluminum wiring. Typical residential stuff. Probably slightly better than average. No damage to anything else in the house, just the cable modem and an SDR USB stick. Both still powered up, but were deaf. The SDR radio's connected to a small ~14" antenna sitting inside. I have plenty of Internet of Crap devices all over the place too.Just curious: is this also true in the case of the structure where this damage occurred?