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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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DIY surge protection...
On Mar 21, 1:47*am, "Existential Angst"
wrote: Awl -- On the main breaker box, for the whole house. First Q: *Is surge protection strictly lightning-related? Holmes on Homes was emphasizing this, saying $500 wasn't much for the protection it affords. $500?????????????? * * * Holy ****..... EA This has blown out to heaps of replies, so its probably got political. And someone has maybe given you an answer thats of use. Dunno. Wont add to that. Based solely on my experience as a working electronics tech, I can say the following from experience. No theory involved. Their called MOV's - Metal Oxide Varistors. Designed to short out when overvoltaged by......you choose the tolerance... Come in 2 sizes - big and little. Big ones are on the side of your house near the switchboard. In cartridges, so they are replaceable. These have a dirty big earth wire connected to them - the theory is that so much current will flow that the supply authority fuse at your cable entry blows and protects your house stuff. Little ones - in lotsa things, and should be more of em. You can buy plug in ones for a few bucks - and remember, you gets what you pay for. Getting popular combined into home entertainment power boards. Also inside things. Good example is the microwave oven - have them across the mains input to the control panel. Fitted after the fuse, and the tracks running up to it are thin, designed to fuse. Works well, usually protects things on the same wiring circuit. With a lightning strike, all bets are off. Anything can happen, but mostly total destruction no matter what protection you have installed. Hope that helps, Andrew VK3BFA. |
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