We put new siding on our house and the wife didn't like the color of the old NID which had been painted over. Took me a while to get one since the phone company won't sell you one and they won't replace it unless it's broke. :-p Graybar carries the former Siecor now Corning only products. http://www.corningcablesystems.com/web/library/litindex.nsf/SubscriberDemarcation Looks like these guys build the surge suppressors that go inside. Maybe you can put a better quality SPD in your NID. http://www.tii-industries.com/general/index.htm -------Original Message------- From: Lawrence Lile Sent: 05/01/03 07:34 AM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE]: AC power surges/sags > > Well, on a similar note, I have a large pair of paperweights sitting by my computer that used to be a router and a DSL modem. Also my Telco's router apparently took a hit in the same lightning storm, according to my ISP. What can be done about surge supression on incoming telephone lines? I used to screw an MOV right on the terminals of the NID coming into my house, but the telephone company always removes them so I quit trying that. Perhaps I need a little box outside their precious NID with my own surge killer inside. What would I put in there besides MOV's? Surely capacitors would kill off the high frequency DSL signal riding on top of the voice signal? -- Lawrence Lile Mark Peterson Sent by: pic microcontroller discussion list 05/01/2003 07:01 AM Please respond to pic microcontroller discussion list To: PICLIST@MITVMA.MIT.EDU cc: Subject: [EE]: AC power surges/sags As Lawrence Lile mentioned, utility company's set their tripping and reclosing schemes differently. It varies even at a single utiltiy depending if the line is rural or urban, overhead or underground, and on the available close-in and end-of-line fault current. I typically set overhead distribution lines with three trips to lockout. The first trip used an instantaneous trip time that would trip for phase-to-phase and phase-to-ground faults, with a fast reclose. The purpose of this was clear temporary faults, preserve fuses, and restore service quickly. Subsequent trips would be on timed-current curves. This was done to force downstream fuses or line reclosers to open and isolate the fault. Reclose times were longer as well. After a total of three attempts, the breaker would be locked open. On underground feeders, we would trip once and lockout. If there is a fault on that system, something is really bad and reclosing would simply cause mroe damage. Mark Peterson -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu