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41. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 12:03:50 -0400; Probably the larger issue in the 3-wire 120/240V configuration (e.g., unmodified Alpha 70/77 series) is if neutral and ground are tied at the equipment -- and neutral accidentally lifts above ground; /archives//html/Amps/2011-04/msg00104.html (10,308 bytes)
42. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "LA7SL Nils Petter" <la7sl@norgespost.no>; Date: Mon, 4 Apr 2011 18:19:43 +0200; Strange ! Here in Norway the standard is also 2 wire 230V in residential areas, 3 Phase is becoming more and more common, but the phases are often split to 2 wire 1 PH systems at the intake panel and; /archives//html/Amps/2011-04/msg00106.html (13,088 bytes)
43. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 04 Apr 2011 09:44:15 -0700; There's another very good way to do it, as practiced by Ten Tec in the Titan 425. The 120V blower runs across one half of the primary of the high voltage transformer, and the center tap is not bonded; /archives//html/Amps/2011-04/msg00109.html (10,080 bytes)
44. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 13:22:15 -0400; Right, Jim. I should have placed a caveat that it's the only right way without modifying the amp. Knowing most Alpha owners, they would already scoff at what I've done to my 77Dx amp! Paul, W9AC ____; /archives//html/Amps/2011-04/msg00111.html (11,023 bytes)
45. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 04 Apr 2011 10:50:35 -0700; While this practice DOES exist, and a sub-section was added to NEC to allow it with severe restrictions on HOW it can be used, it is used only a few fools who don't understand the laws of physics. It; /archives//html/Amps/2011-04/msg00114.html (9,335 bytes)
46. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Mon, 04 Apr 2011 11:06:47 -0700; ORIGINAL MESSAGE: REPLY: None the less, it sounds like a good idea from a safety point of view. As I see it, the maximum exposure between any hot conductor and ground would be only 60 volts. Doesn't; /archives//html/Amps/2011-04/msg00115.html (8,880 bytes)
47. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 14:24:18 -0400; For point of clarification on the Alpha 77 series, I had forgotten that the 120V blower is actually in series with the plate supply primary such that the blower forces more air as the load increases.; /archives//html/Amps/2011-04/msg00116.html (12,739 bytes)
48. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Mon, 04 Apr 2011 14:43:25 -0400; Here you can wire your own house, it just has to be inspected to make sure it meets code. Building permit wise I think it's $15 per breaker/circuit added. 73 Roger (K8RI) ____________________________; /archives//html/Amps/2011-04/msg00117.html (9,247 bytes)
49. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Mon, 4 Apr 2011 16:05:59 -0400; Just to be clear, the Alpha 77 has a 50 volt winding to buck the fan voltage but it is not in series with the main transformer windings. The main transformer windings go directly to 220. the fan runs; /archives//html/Amps/2011-04/msg00131.html (14,760 bytes)
50. Re: [Amps] what is a 4 wire 240VAC service? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 4 Apr 2011 16:32:25 -0400; Gary, Excellent clarification. Looking at the schematic, the 50V primary shows as being the only primary "coupled" to the plate secondary. I put that in quotes because it's easy to infer the incorrec; /archives//html/Amps/2011-04/msg00133.html (15,790 bytes)

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