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1. [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 12:00:25 -0400; I need to put in a new 240V outlet at my operating position. Since one of my amp power supplies, a Johnson 2000 has the low voltage portion operating on 120V, I suppose I have to put in a 3 wire plus; /archives//html/Amps/2009-08/msg00146.html (6,987 bytes)
2. Re: [Amps] 240V Outlet (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 09 Aug 2009 09:31:27 -0700; It depends on how the power supply is wired. One good way to get 120 volts from a 240 volt circuit is by running that load (typically a cooling fan) from half of a center-tapped primary of the main p; /archives//html/Amps/2009-08/msg00148.html (8,452 bytes)
3. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 12:58:14 -0400; Well, the Johnson 2000 PS is an example of old construction. The neutral is connect to the chassis and the 120V circuits are wired between one hot phase and the chassis so you have to make sure you h; /archives//html/Amps/2009-08/msg00149.html (11,291 bytes)
4. Re: [Amps] 240V Outlet (score: 1): Author: Martin A Flynn <maflynn@att.net>; Date: Sun, 09 Aug 2009 13:05:59 -0400; David, We are adding circuits for power amplifiers at one of the local EOC: Our electrician recommended that we pull both phases, neutral and ground to each location, regardless if the device needed; /archives//html/Amps/2009-08/msg00151.html (8,176 bytes)
5. Re: [Amps] 240V Outlet (score: 1): Author: Glen Zook <gzook@yahoo.com>; Date: Sun, 9 Aug 2009 10:35:41 -0700 (PDT); One thing to consider is the fact that the "regular" plug in 240 VAC connectors can be "jerked" from the outlet in an emergency whereas the "twist lock" connectors cannot be. Glen, K9STH Website: htt; /archives//html/Amps/2009-08/msg00152.html (7,560 bytes)
6. Re: [Amps] 240V Outlet (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 9 Aug 2009 13:52:41 -0400; Id check out the primary circuit carefully in the Johnson David. In the Thunderbolt II (aka Tempo 2000) they used the neutral as a ground on 120 & 240. In fact they tied the neutral and ground togeth; /archives//html/Amps/2009-08/msg00154.html (8,000 bytes)
7. Re: [Amps] 240V Outlet (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 9 Aug 2009 14:19:13 -0400; Unless you want to spend the extra money for wire and 30-40A connectors, a pulling 5000W from that rig unless its into a meltdown. Carl KM1H _______________________________________________ Amps maili; /archives//html/Amps/2009-08/msg00159.html (12,977 bytes)
8. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 14:32:14 -0400; That's a problem and needs correction. It wasn't a safe design practice in 1955 and it's just as much a safety concern in 2009. Here's why: If the current-carrying neutral+ground lead faults with a; /archives//html/Amps/2009-08/msg00162.html (9,381 bytes)
9. Re: [Amps] 240V Outlet (score: 1): Author: Martin A Flynn <maflynn@att.net>; Date: Sun, 09 Aug 2009 14:50:54 -0400; Glen, That's a valid point. Safety first. What thwarts this is that for most installs, the receptacle is behind the desk or the amp, and not accessible in an emergency. In my case, I picked up a 100A; /archives//html/Amps/2009-08/msg00164.html (8,791 bytes)
10. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 15:12:36 -0400; Excellent advice. It's been a while since I've reviewed that section of the NEC, but I suspect over-sizing the wire size is fine, but I would never oversize the breaker current rating, nor would I o; /archives//html/Amps/2009-08/msg00166.html (9,022 bytes)
11. Re: [Amps] 240V Outlet (score: 1): Author: Martin A Flynn <maflynn@att.net>; Date: Sun, 09 Aug 2009 16:28:59 -0400; Paul Christensen wrote:ice. Paul, The breaker and device are the same rating. My comment was to state that his recommendation was to make the conductors and ground one wire gauge larger then NFPA 70; /archives//html/Amps/2009-08/msg00167.html (8,790 bytes)
12. Re: [Amps] 240V Outlet (score: 1): Author: jimsmitheguard-a@yahoo.com; Date: Sun, 9 Aug 2009 14:49:30 -0700 (PDT); That's what you will need if you want both 120V and 240V. Jim Smith, EE KQ6UV I need to put in a new 240V outlet at my operating position. Since one of my amp power supplies, a Johnson 2000 has th; /archives//html/Amps/2009-08/msg00169.html (8,523 bytes)
13. Re: [Amps] 240V Outlet (score: 1): Author: jimsmitheguard-a@yahoo.com; Date: Sun, 9 Aug 2009 14:59:04 -0700 (PDT); David, The NEC does not permit you to protect a #10 circuit with anything larger than a 30 ampere breaker. Use #8 for a 40 ampere circuit. If you use a large circuit to feed small loads, you must t; /archives//html/Amps/2009-08/msg00170.html (9,273 bytes)
14. Re: [Amps] 240V Outlet (score: 1): Author: jimsmitheguard-a@yahoo.com; Date: Sun, 9 Aug 2009 15:04:36 -0700 (PDT); Twistlocks are good when the receptacle points downward, or when you want to keep everyone from plugging something else into the outlet. Pin and sleeve outlets are probably overkill. Jim Smith, EE; /archives//html/Amps/2009-08/msg00171.html (8,733 bytes)
15. Re: [Amps] 240V Outlet (score: 1): Author: jimsmitheguard-a@yahoo.com; Date: Sun, 9 Aug 2009 15:12:36 -0700 (PDT); I am a believer in safety, but a shunt trip breaker would be a better option. Jim Smith, EE KQ6UV In my case, I picked up a 100A Square D contactor on eBAY that is installed upstream of the sub-pa; /archives//html/Amps/2009-08/msg00172.html (9,189 bytes)
16. Re: [Amps] 240V Outlet (score: 1): Author: jimsmitheguard-a@yahoo.com; Date: Sun, 9 Aug 2009 15:26:55 -0700 (PDT); True, but the NEC makes an exception for 15 ampere general purpose receptacles on a 20 ampere circuit. As I already mentioned, if you want to oversize the breaker and conductors, you must install a; /archives//html/Amps/2009-08/msg00173.html (8,768 bytes)
17. Re: [Amps] 240V Outlet (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Sun, 09 Aug 2009 19:43:47 -0400; OK, let me ask a question here. All of my breaker are 15A. Can I replace any of them with 20A breakers. Wiring is 12/2 with ground. David Kc2JD/4 _______________________________________________ Amps; /archives//html/Amps/2009-08/msg00176.html (9,655 bytes)
18. Re: [Amps] 240V Outlet (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 9 Aug 2009 19:50:37 -0400; That only makes sense if the I*R drop is excessive. Since the Invader 2000 is only going to draw about half the ratings of #12 wire, then going to #10 makes little sense on a basement long run. Going; /archives//html/Amps/2009-08/msg00177.html (10,675 bytes)
19. Re: [Amps] 240V Outlet (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 9 Aug 2009 19:59:08 -0400; If I was pretty sure that my amp powering needs didn't change in the future and had no issue with a slightly more invasive approach to modifying the PS (versus lifting neutral from ground), I would; /archives//html/Amps/2009-08/msg00178.html (9,294 bytes)
20. Re: [Amps] 240V Outlet (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 9 Aug 2009 20:13:16 -0400; Yes to the question since #12 is rated for 20A breakers. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a; /archives//html/Amps/2009-08/msg00180.html (10,770 bytes)

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