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21. [Amps] Fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 7 Jan 2011 16:02:43 -0800; Just dont over fuse. The usual 1200W out amp uses 10-12A; 15A for 1500-2200W, etc at 240VAC. Carl KM1H breaker ?? Ideally, a 2 x pole, 15A , controlled magnetic hydraulic breaker would be the 1st cho; /archives//html/Amps/2011-01/msg00069.html (8,869 bytes)
22. Re: [Amps] Fuses (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 7 Jan 2011 19:25:14 -0500; Fuses are more reliable, those breakers trip a little bit sooner every time they let go and sometimes its a replacement nightmare to get at them. I had lots of curse words for a Thunderbolt II a few; /archives//html/Amps/2011-01/msg00070.html (9,843 bytes)
23. Re: [Amps] Fuses (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Fri, 7 Jan 2011 19:41:04 -0600; Anyone interested I have many surplus P&B or Airpax 2 pole 20A 240vac breakers that are panel mount Removed from working industrial controls $2.50 each plus postage Paul K0UYA _______________________; /archives//html/Amps/2011-01/msg00071.html (9,812 bytes)
24. Re: [Amps] Fuses (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Fri, 07 Jan 2011 21:00:31 -0500; I thought that was how we were supposed to find the fault. Increase the fuse size step by step until the problem either blows up of catches fire. Of course it may take something expensive along with; /archives//html/Amps/2011-01/msg00072.html (10,085 bytes)
25. Re: [Amps] Fuses (score: 1): Author: "James R Carr" <n7fcf@hctc.com>; Date: Fri, 7 Jan 2011 18:01:40 -0800; Where pray tell do you get a hydraulic breaker? I have installed several thousand over the years but have yet to see one filled with oil. As for current limiting devices, the fastest breaker will hol; /archives//html/Amps/2011-01/msg00073.html (10,215 bytes)
26. Re: [Amps] Fuses (score: 1): Author: "Paul Kraemer" <elespe@lisco.com>; Date: Fri, 7 Jan 2011 20:50:55 -0600; It is a terminology thing as in magnetic / hydraulic trip Also, we routinely use supplemental IEC protection devices that have an adjustable thermal trip plus a near instantaneous overcurrent trip Ac; /archives//html/Amps/2011-01/msg00074.html (11,306 bytes)
27. Re: [Amps] Fuses (score: 1): Author: "James R Carr" <n7fcf@hctc.com>; Date: Fri, 7 Jan 2011 22:11:50 -0800; Who makes it and what's the model number? I'd like to see the specs on it especially the UL test results. When I retired in 2000 the only way they were able to get a breaker to clear a fault in less; /archives//html/Amps/2011-01/msg00075.html (12,792 bytes)
28. Re: [Amps] Fuses (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 8 Jan 2011 08:34:30 +0000; A fuse provides NO current limiting until it blows; and a breaker provides NO current limiting until it breaks. A lot of damage can be done in those first few milliseconds, which is why the fuse/brea; /archives//html/Amps/2011-01/msg00076.html (8,828 bytes)
29. Re: [Amps] Fuses (score: 1): Author: "James R Carr" <n7fcf@hctc.com>; Date: Sat, 8 Jan 2011 00:55:54 -0800; Ask Bussman for their cataloge. They build current limiting fuses that will clear a fault of several thousand amps in less than 1/2 cycle -- Original Message -- From: "Ian White GM3SEK" <gm3sek@ifwte; /archives//html/Amps/2011-01/msg00078.html (9,351 bytes)
30. Re: [Amps] Fuses (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Sat, 8 Jan 2011 09:17:47 +0000; Years ago when I was a school I part time (Saturday and some evenings) job working in Tandy (Radio Shack). Tandy used to see fuses in packs of 3. This guy came in and bought a pack of fuses. Then a f; /archives//html/Amps/2011-01/msg00079.html (9,755 bytes)
31. Re: [Amps] Fuses (score: 1): Author: "Vic, K2VCO" <vic@rakefet.com>; Date: Sat, 08 Jan 2011 01:44:58 -0800; Which is one reason the fuse should be a fast-blow type -- to save the surge resistor in the event of a flashover. -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __________________________________; /archives//html/Amps/2011-01/msg00080.html (7,981 bytes)
32. [Amps] Fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 8 Jan 2011 02:18:50 -0800; A fuse provides NO current limiting until it blows; and a breaker provides NO current limiting until it breaks. A lot of damage can be done in those first few milliseconds, which is why the fuse/brea; /archives//html/Amps/2011-01/msg00081.html (11,324 bytes)
33. [Amps] Fuses (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 8 Jan 2011 04:25:50 -0800; Who makes it and what's the model number? I'd like to see the specs on it especially the UL test results. When I retired in 2000 the only way they were able to get a breaker to clear a fault in less; /archives//html/Amps/2011-01/msg00082.html (14,841 bytes)
34. Re: [Amps] Fuses (score: 1): Author: donroden@hiwaay.net; Date: Sat, 08 Jan 2011 08:00:38 -0600; All the commercial AMs and FMs used silicone-dampened AC overloads. All the AC current ran through a five or six turn high current relay that was ( at rated current ) almost ready to pull the normal; /archives//html/Amps/2011-01/msg00084.html (9,053 bytes)
35. Re: [Amps] Fuses (score: 1): Author: TexasRF@aol.com; Date: Sat, 8 Jan 2011 09:05:51 EST; All this talk about HV fuses got me wondering how quickly a fuse will blow. After some time googling, I realize this simple question is not so simple after all. So, is there a good reference that wil; /archives//html/Amps/2011-01/msg00085.html (8,785 bytes)
36. Re: [Amps] Fuses (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sat, 8 Jan 2011 14:40:58 +0000; The usual technique is to apply a crowbar short across the valuable tube, while other, slower, circuits are shutting down the rest of the power supply. The voltage is a bit high for a thyristor crowb; /archives//html/Amps/2011-01/msg00086.html (9,676 bytes)
37. Re: [Amps] Fuses (score: 1): Author: Commander John <crazytvjohn@yahoo.com>; Date: Sat, 8 Jan 2011 10:19:55 -0800 (PST); Hi I needed fuses for my Commander Magnum recently and found they used Buss BAF 20 fuses which are expensive. They are fast blow fuses. Why they needed these big Midget fuses is beyond me. a Pair loc; /archives//html/Amps/2011-01/msg00090.html (10,693 bytes)
38. Re: [Amps] Fuses (score: 1): Author: "James R Carr" <n7fcf@hctc.com>; Date: Sat, 8 Jan 2011 14:22:56 -0800; Agreed, The first instant in time you have the full output of Bonnyville Dam on the fault. But then the impedance of the system kicks in and limits it. But still depending on the size of the utility; /archives//html/Amps/2011-01/msg00095.html (14,790 bytes)
39. Re: [Amps] Fuses (score: 1): Author: "James R Carr" <n7fcf@hctc.com>; Date: Sat, 8 Jan 2011 14:36:40 -0800; If you can get a copy of ferms Fast finder from your local library, "its a cheat sheet for the NEC" in the back he go into available fault current and it's calculation. In exterme cases you have to i; /archives//html/Amps/2011-01/msg00096.html (18,149 bytes)
40. Re: [Amps] Fuses (score: 1): Author: "Roger (K8RI)" <sub1@rogerhalstead.com>; Date: Sat, 08 Jan 2011 17:38:22 -0500; Our mains weren't quite that large, but they were big...It's been too long for me to remember the actual size. They used magnetic quenching in arc chutes. They could open under full load without self; /archives//html/Amps/2011-01/msg00097.html (15,936 bytes)

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