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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Equipment Protection from 240VAC
Hi Tom,
Thank you very much. You by far make the most sense. Unfortunately, many reply without much thought to the real problem. Please ignore that one person who said you are "arrogant". I think he is jealous of your impressive reply. I wish there were more technical people like you around. Regards, Brad On 2 May 2006 15:19:59 -0700, "w_tom" wrote: Another told you to buy a plug-in protector. He did not say why. Instead, he only promoted classic myth. Meanwhile, this post will use numbers. A broken nuetral means a voltage as much as but typically not close to 240 volts appears on your 120 volts. What will a plug-in protector do? It says right on the box - let-throug voltage 330 volts. IOW it ignoreds voltages below 330 volts. It does nothing - remains just like an open switch - until the rare 330+ volt transient occurs. Numbers above demonstrate why plug-in protectors do nothing. Then we add its joules rating that says the plug-in proetctor will save itself; leaving the appliance to fend for itself. One of the important reasons why your building has dedicated earthing is so current can take another path. This particularly important because without that earthing ground, then current may even take an outgoing path via a gas line or other dangerous path. How is your earth ground. Has your electric earthing been upgraded to meet (and also exceed) post 1990 code requirements? If not, then consider this to aleviate any future and more catastrophic failures. And again, notice how many will not post like an engineer. Right there on the box is the number that says a plug-in protector would have nothing useful. Too many hear and believe myths rather than first learn technical facts. The plug-in protector would have done nothing. But your failure suggest you earthing mayt need inspection - and may need enhancement. At minimum, you AC electric earthing (and all other incoming utilities must connect to this) should meet post 1990 code requirements. Don't think in terms of some magic box. Think in terms of a 'system' solution. The 'system' require an earthing rod. Brad wrote: The branch of a tree broke and knocked out the neutral wire to my sister's house. As a result, some of her expensive electronics equipment was damaged. I know about surge protectors, but I want to buy a device/s (perhaps in a power strip) that creates a "short" (and blows a fuse) when the AC voltage goes above 180V. Does anyone know where I can order it? |
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