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Groups > sci.electronics.design > #434222 > unrolled thread
| Started by | Syd Rumpo <usenet@nononono.co.uk> |
|---|---|
| First post | 2016-11-08 09:41 +0000 |
| Last post | 2016-11-12 07:05 +0000 |
| Articles | 20 on this page of 49 — 15 participants |
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Single or double pole mains switch in USA? Syd Rumpo <usenet@nononono.co.uk> - 2016-11-08 09:41 +0000
Re: Single or double pole mains switch in USA? jrwalliker@gmail.com - 2016-11-08 06:10 -0800
Re: Single or double pole mains switch in USA? John Larkin <jjlarkin@highlandtechnology.com> - 2016-11-08 06:29 -0800
Re: Single or double pole mains switch in USA? Martin Riddle <martin_ridd@verizon.net> - 2016-11-08 11:55 -0500
Re: Single or double pole mains switch in USA? Martin Riddle <martin_ridd@verizon.net> - 2016-11-08 11:56 -0500
Re: Single or double pole mains switch in USA? Martin Riddle <martin_ridd@verizon.net> - 2016-11-08 11:58 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-08 11:05 -0600
Re: Single or double pole mains switch in USA? krw <krw@nowhere.com> - 2016-11-08 12:48 -0500
Re: Single or double pole mains switch in USA? jurb6006@gmail.com - 2016-11-08 10:46 -0800
Re: Single or double pole mains switch in USA? M Philbrook <jamie_ka1lpa@charter.net> - 2016-11-08 17:22 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-11 20:22 -0600
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-11 20:26 -0600
Re: Single or double pole mains switch in USA? DJ Delorie <dj@delorie.com> - 2016-11-11 22:07 -0500
Re: Single or double pole mains switch in USA? M Philbrook <jamie_ka1lpa@charter.net> - 2016-11-12 12:03 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-12 12:34 -0600
Re: Single or double pole mains switch in USA? M Philbrook <jamie_ka1lpa@charter.net> - 2016-11-12 16:20 -0500
Re: Single or double pole mains switch in USA? pedro <me@privacy.net> - 2016-11-13 09:32 +0800
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-12 19:52 -0600
Re: Single or double pole mains switch in USA? Jasen Betts <jasen@xnet.co.nz> - 2016-11-13 05:11 +0000
Re: Single or double pole mains switch in USA? M Philbrook <jamie_ka1lpa@charter.net> - 2016-11-13 13:07 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-13 16:44 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-13 18:13 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-12 19:48 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-12 20:56 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-12 20:10 -0600
Re: Single or double pole mains switch in USA? Jasen Betts <jasen@xnet.co.nz> - 2016-11-13 04:57 +0000
Re: Single or double pole mains switch in USA? upsidedown@downunder.com - 2016-11-13 11:07 +0200
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-13 09:57 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-13 18:14 -0500
Re: Single or double pole mains switch in USA? upsidedown@downunder.com - 2016-11-14 21:19 +0200
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-14 19:54 -0500
Re: Single or double pole mains switch in USA? upsidedown@downunder.com - 2016-11-15 09:55 +0200
Re: Single or double pole mains switch in USA? Glen Walpert <nospam@null.void> - 2016-11-15 17:55 +0000
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-14 17:39 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-14 19:55 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-14 17:46 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-14 19:56 -0500
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-15 17:00 -0600
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-15 19:20 -0500
Re: Single or double pole mains switch in USA? upsidedown@downunder.com - 2016-11-12 20:53 +0200
Re: Single or double pole mains switch in USA? jurb6006@gmail.com - 2016-11-13 10:50 -0800
Re: Single or double pole mains switch in USA? jurb6006@gmail.com - 2016-11-13 10:58 -0800
Re: Single or double pole mains switch in USA? John S <Sophi.2@invalid.org> - 2016-11-12 12:31 -0600
Re: Single or double pole mains switch in USA? krw <krw@nowhere.com> - 2016-11-08 12:46 -0500
Re: Single or double pole mains switch in USA? jurb6006@gmail.com - 2016-11-08 10:40 -0800
Re: Single or double pole mains switch in USA? krw <krw@somewhere.com> - 2016-11-08 19:13 -0500
Re: Single or double pole mains switch in USA? whit3rd <whit3rd@gmail.com> - 2016-11-08 10:50 -0800
Re: Single or double pole mains switch in USA? Syd Rumpo <usenet@nononono.co.uk> - 2016-11-09 14:06 +0000
Re: Single or double pole mains switch in USA? Jasen Betts <jasen@xnet.co.nz> - 2016-11-12 07:05 +0000
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| From | Syd Rumpo <usenet@nononono.co.uk> |
|---|---|
| Date | 2016-11-08 09:41 +0000 |
| Subject | Single or double pole mains switch in USA? |
| Message-ID | <nvs6j3$1j2$1@dont-email.me> |
In an instrument which will be sold in the USA, is there a requirement for double pole switching of the mains? There'll be a chassis-mount IEC mains input plug at the rear and a mains switch on the front, then off to PSUs and low voltage electronics. It may seem a silly question, but the mains switch used on the prototype is rather nice but only available as single-pole. Is there some guidance which is less than hundreds of pages of regulation? Cheers -- Syd
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| From | jrwalliker@gmail.com |
|---|---|
| Date | 2016-11-08 06:10 -0800 |
| Message-ID | <959da9eb-e3da-45a1-8836-48ff560d1473@googlegroups.com> |
| In reply to | #434222 |
On Tuesday, 8 November 2016 09:41:24 UTC, Syd Rumpo wrote: > In an instrument which will be sold in the USA, is there a requirement > for double pole switching of the mains? > > There'll be a chassis-mount IEC mains input plug at the rear and a mains > switch on the front, then off to PSUs and low voltage electronics. > > It may seem a silly question, but the mains switch used on the prototype > is rather nice but only available as single-pole. > > Is there some guidance which is less than hundreds of pages of regulation? > > Cheers > -- > Syd You will probably need to comply with ISO/BS/EN/UL 61010-1:2010 which states: 6.11.4.2 Switches and circuit-breakers An equipment switch or circuit-breaker employed as a disconnecting device shall meet the relevant requirements of IEC 60947-1 and IEC 60947-3 and be suitable for the application. I can't see anything which requires double-pole switching. I don't have copies of 60947-1 and -3 to check those however. John
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| From | John Larkin <jjlarkin@highlandtechnology.com> |
|---|---|
| Date | 2016-11-08 06:29 -0800 |
| Message-ID | <97o32c1ehothha7hasom23m32n2kopsvob@4ax.com> |
| In reply to | #434231 |
On Tue, 8 Nov 2016 06:10:25 -0800 (PST), jrwalliker@gmail.com wrote: >On Tuesday, 8 November 2016 09:41:24 UTC, Syd Rumpo wrote: >> In an instrument which will be sold in the USA, is there a requirement >> for double pole switching of the mains? >> >> There'll be a chassis-mount IEC mains input plug at the rear and a mains >> switch on the front, then off to PSUs and low voltage electronics. >> >> It may seem a silly question, but the mains switch used on the prototype >> is rather nice but only available as single-pole. >> >> Is there some guidance which is less than hundreds of pages of regulation? >> >> Cheers >> -- >> Syd > >You will probably need to comply with ISO/BS/EN/UL 61010-1:2010 >which states: > >6.11.4.2 >Switches and circuit-breakers >An equipment switch or circuit-breaker employed as a disconnecting >device shall meet the relevant requirements of IEC 60947-1 and >IEC 60947-3 and be suitable for the application. > >I can't see anything which requires double-pole switching. I don't >have copies of 60947-1 and -3 to check those however. > >John > All those IEC specs are expensive, and every one refers to a few more. Nice racket. -- John Larkin Highland Technology, Inc lunatic fringe electronics
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| From | Martin Riddle <martin_ridd@verizon.net> |
|---|---|
| Date | 2016-11-08 11:55 -0500 |
| Message-ID | <hq042cdp5ptbd9927llhmn0tflvgkvrkag@4ax.com> |
| In reply to | #434233 |
On Tue, 08 Nov 2016 06:29:18 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote: >On Tue, 8 Nov 2016 06:10:25 -0800 (PST), jrwalliker@gmail.com wrote: > >>On Tuesday, 8 November 2016 09:41:24 UTC, Syd Rumpo wrote: >>> In an instrument which will be sold in the USA, is there a requirement >>> for double pole switching of the mains? >>> >>> There'll be a chassis-mount IEC mains input plug at the rear and a mains >>> switch on the front, then off to PSUs and low voltage electronics. >>> >>> It may seem a silly question, but the mains switch used on the prototype >>> is rather nice but only available as single-pole. >>> >>> Is there some guidance which is less than hundreds of pages of regulation? >>> >>> Cheers >>> -- >>> Syd >> >>You will probably need to comply with ISO/BS/EN/UL 61010-1:2010 >>which states: >> >>6.11.4.2 >>Switches and circuit-breakers >>An equipment switch or circuit-breaker employed as a disconnecting >>device shall meet the relevant requirements of IEC 60947-1 and >>IEC 60947-3 and be suitable for the application. >> >>I can't see anything which requires double-pole switching. I don't >>have copies of 60947-1 and -3 to check those however. >> >>John >> > >All those IEC specs are expensive, and every one refers to a few more. > >Nice racket. The 'General' specs refer to 'particulars', I think. Cheers
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| From | Martin Riddle <martin_ridd@verizon.net> |
|---|---|
| Date | 2016-11-08 11:56 -0500 |
| Message-ID | <5t042cl48bn3irsftm5qrgsjopt4brevqv@4ax.com> |
| In reply to | #434243 |
On Tue, 08 Nov 2016 11:55:43 -0500, Martin Riddle <martin_ridd@verizon.net> wrote: >On Tue, 08 Nov 2016 06:29:18 -0800, John Larkin ><jjlarkin@highlandtechnology.com> wrote: > >>On Tue, 8 Nov 2016 06:10:25 -0800 (PST), jrwalliker@gmail.com wrote: >> >>>On Tuesday, 8 November 2016 09:41:24 UTC, Syd Rumpo wrote: >>>> In an instrument which will be sold in the USA, is there a requirement >>>> for double pole switching of the mains? >>>> >>>> There'll be a chassis-mount IEC mains input plug at the rear and a mains >>>> switch on the front, then off to PSUs and low voltage electronics. >>>> >>>> It may seem a silly question, but the mains switch used on the prototype >>>> is rather nice but only available as single-pole. >>>> >>>> Is there some guidance which is less than hundreds of pages of regulation? >>>> >>>> Cheers >>>> -- >>>> Syd >>> >>>You will probably need to comply with ISO/BS/EN/UL 61010-1:2010 >>>which states: >>> >>>6.11.4.2 >>>Switches and circuit-breakers >>>An equipment switch or circuit-breaker employed as a disconnecting >>>device shall meet the relevant requirements of IEC 60947-1 and >>>IEC 60947-3 and be suitable for the application. >>> >>>I can't see anything which requires double-pole switching. I don't >>>have copies of 60947-1 and -3 to check those however. >>> >>>John >>> >> >>All those IEC specs are expensive, and every one refers to a few more. >> >>Nice racket. > >The 'General' specs refer to 'particulars', I think. > >Cheers Opps, its the other way around ;) Cheers
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| From | Martin Riddle <martin_ridd@verizon.net> |
|---|---|
| Date | 2016-11-08 11:58 -0500 |
| Message-ID | <du042chi9ku2kqans0nektk4oe7vjrgtvo@4ax.com> |
| In reply to | #434222 |
On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> wrote: >In an instrument which will be sold in the USA, is there a requirement >for double pole switching of the mains? > >There'll be a chassis-mount IEC mains input plug at the rear and a mains >switch on the front, then off to PSUs and low voltage electronics. > >It may seem a silly question, but the mains switch used on the prototype >is rather nice but only available as single-pole. > >Is there some guidance which is less than hundreds of pages of regulation? > >Cheers I believe its only medical products that require double pole and 2 phase equipment. Cheers
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| From | John S <Sophi.2@invalid.org> |
|---|---|
| Date | 2016-11-08 11:05 -0600 |
| Message-ID | <nvt0i0$3o8$1@dont-email.me> |
| In reply to | #434245 |
On 11/8/2016 10:58 AM, Martin Riddle wrote: > On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> > wrote: > >> In an instrument which will be sold in the USA, is there a requirement >> for double pole switching of the mains? >> >> There'll be a chassis-mount IEC mains input plug at the rear and a mains >> switch on the front, then off to PSUs and low voltage electronics. >> >> It may seem a silly question, but the mains switch used on the prototype >> is rather nice but only available as single-pole. >> >> Is there some guidance which is less than hundreds of pages of regulation? >> >> Cheers > > I believe its only medical products that require double pole and 2 > phase equipment. > > Cheers > 2 phase? Please educate me on this. I know that single phase and 3 phase are common, but I have never encountered 2 phase.
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| From | krw <krw@nowhere.com> |
|---|---|
| Date | 2016-11-08 12:48 -0500 |
| Message-ID | <ju342clsgnilusvmkflofu5le7d06nfq6h@4ax.com> |
| In reply to | #434246 |
On Tue, 8 Nov 2016 11:05:05 -0600, John S <Sophi.2@invalid.org> wrote: >On 11/8/2016 10:58 AM, Martin Riddle wrote: >> On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> >> wrote: >> >>> In an instrument which will be sold in the USA, is there a requirement >>> for double pole switching of the mains? >>> >>> There'll be a chassis-mount IEC mains input plug at the rear and a mains >>> switch on the front, then off to PSUs and low voltage electronics. >>> >>> It may seem a silly question, but the mains switch used on the prototype >>> is rather nice but only available as single-pole. >>> >>> Is there some guidance which is less than hundreds of pages of regulation? >>> >>> Cheers >> >> I believe its only medical products that require double pole and 2 >> phase equipment. >> >> Cheers >> > >2 phase? Please educate me on this. I know that single phase and 3 phase >are common, but I have never encountered 2 phase. Probably ungrounded (or balanced).
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| From | jurb6006@gmail.com |
|---|---|
| Date | 2016-11-08 10:46 -0800 |
| Message-ID | <badd19bc-f589-4322-926d-56535f142021@googlegroups.com> |
| In reply to | #434246 |
>"2 phase? Please educate me on this. I know that single phase >and 3 phase >are common, but I have never encountered 2 phase. " Pretty sure what people mean when they say that they mean something that runs off 240 volts and therefore, in the US, has two hots. Electricians and the power companies don't call it that but some people do. They also used to have four phase but I don't see any real advantage to it. Maybe they didn't either because it is apparently long been phased out. (the pun fits...)
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| From | M Philbrook <jamie_ka1lpa@charter.net> |
|---|---|
| Date | 2016-11-08 17:22 -0500 |
| Message-ID | <MPG.328c1a3df276dd05989f72@news.eternal-september.org> |
| In reply to | #434246 |
In article <nvt0i0$3o8$1@dont-email.me>, Sophi.2@invalid.org says... > > On 11/8/2016 10:58 AM, Martin Riddle wrote: > > On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> > > wrote: > > > >> In an instrument which will be sold in the USA, is there a requirement > >> for double pole switching of the mains? > >> > >> There'll be a chassis-mount IEC mains input plug at the rear and a mains > >> switch on the front, then off to PSUs and low voltage electronics. > >> > >> It may seem a silly question, but the mains switch used on the prototype > >> is rather nice but only available as single-pole. > >> > >> Is there some guidance which is less than hundreds of pages of regulation? > >> > >> Cheers > > > > I believe its only medical products that require double pole and 2 > > phase equipment. > > > > Cheers > > > > 2 phase? Please educate me on this. I know that single phase and 3 phase > are common, but I have never encountered 2 phase. really? two leads 90 degree shift.. Now maybe a split phase would be closer since it uses a single secondary with a center tap to get 2 legs 180 degree referenced from the ct. Really... But then again, I bet you can't be educated anymore than Slowman. Jamie
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| From | John S <Sophi.2@invalid.org> |
|---|---|
| Date | 2016-11-11 20:22 -0600 |
| Message-ID | <o05ubr$11i$1@dont-email.me> |
| In reply to | #434292 |
On 11/8/2016 4:22 PM, M Philbrook wrote: > In article <nvt0i0$3o8$1@dont-email.me>, Sophi.2@invalid.org says... >> >> On 11/8/2016 10:58 AM, Martin Riddle wrote: >>> On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> >>> wrote: >>> >>>> In an instrument which will be sold in the USA, is there a requirement >>>> for double pole switching of the mains? >>>> >>>> There'll be a chassis-mount IEC mains input plug at the rear and a mains >>>> switch on the front, then off to PSUs and low voltage electronics. >>>> >>>> It may seem a silly question, but the mains switch used on the prototype >>>> is rather nice but only available as single-pole. >>>> >>>> Is there some guidance which is less than hundreds of pages of regulation? >>>> >>>> Cheers >>> >>> I believe its only medical products that require double pole and 2 >>> phase equipment. >>> >>> Cheers >>> >> >> 2 phase? Please educate me on this. I know that single phase and 3 phase >> are common, but I have never encountered 2 phase. > > really? > > two leads 90 degree shift.. > > Now maybe a split phase would be closer since it uses a single > secondary with a center tap to get 2 legs 180 degree referenced from > the ct. > > Really... But then again, I bet you can't be educated anymore than > Slowman. > > Jamie So then a transformer with a center-tapped secondary running on a single-phase supply is a device which converts single-phase to two-phase? You are dumber than a fence post and are much less useful.
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| From | John S <Sophi.2@invalid.org> |
|---|---|
| Date | 2016-11-11 20:26 -0600 |
| Message-ID | <o05uj8$11i$2@dont-email.me> |
| In reply to | #434292 |
On 11/8/2016 4:22 PM, M Philbrook wrote: > In article <nvt0i0$3o8$1@dont-email.me>, Sophi.2@invalid.org says... >> >> On 11/8/2016 10:58 AM, Martin Riddle wrote: >>> On Tue, 8 Nov 2016 09:41:22 +0000, Syd Rumpo <usenet@nononono.co.uk> >>> wrote: >>> >>>> In an instrument which will be sold in the USA, is there a requirement >>>> for double pole switching of the mains? >>>> >>>> There'll be a chassis-mount IEC mains input plug at the rear and a mains >>>> switch on the front, then off to PSUs and low voltage electronics. >>>> >>>> It may seem a silly question, but the mains switch used on the prototype >>>> is rather nice but only available as single-pole. >>>> >>>> Is there some guidance which is less than hundreds of pages of regulation? >>>> >>>> Cheers >>> >>> I believe its only medical products that require double pole and 2 >>> phase equipment. >>> >>> Cheers >>> >> >> 2 phase? Please educate me on this. I know that single phase and 3 phase >> are common, but I have never encountered 2 phase. > > really? > > two leads 90 degree shift.. > > Now maybe a split phase would be closer since it uses a single > secondary with a center tap to get 2 legs 180 degree referenced from > the ct. > > Really... But then again, I bet you can't be educated anymore than > Slowman. > > Jamie > How often have you encountered a mains supply with 90 degree phase shift, smart ass?
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| From | DJ Delorie <dj@delorie.com> |
|---|---|
| Date | 2016-11-11 22:07 -0500 |
| Message-ID | <xn60nt2y7f.fsf@delorie.com> |
| In reply to | #435020 |
John S <Sophi.2@invalid.org> writes: >>> 2 phase? Please educate me on this. I know that single phase and 3 phase >>> are common, but I have never encountered 2 phase. >> >> really? >> >> two leads 90 degree shift.. > > How often have you encountered a mains supply with 90 degree phase > shift, smart ass? Nikolas Tesla invented it long ago. Just because it isn't used for mains *now* doesn't mean he can't know what it is. Also, it's what stepper motors use, and we encounter those every day. Also, he didn't mention "mains" in that follow-up. Also, replying to pedantry with jackassery is lame. (whereas the opposite is just plain fun ;-)
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| From | M Philbrook <jamie_ka1lpa@charter.net> |
|---|---|
| Date | 2016-11-12 12:03 -0500 |
| Message-ID | <MPG.3291156f63155ddd989f85@news.eternal-september.org> |
| In reply to | #435023 |
In article <xn60nt2y7f.fsf@delorie.com>, dj@delorie.com says... > > John S <Sophi.2@invalid.org> writes: > >>> 2 phase? Please educate me on this. I know that single phase and 3 phase > >>> are common, but I have never encountered 2 phase. > >> > >> really? > >> > >> two leads 90 degree shift.. > > > > How often have you encountered a mains supply with 90 degree phase > > shift, smart ass? > > Nikolas Tesla invented it long ago. Just because it isn't used for > mains *now* doesn't mean he can't know what it is. > > Also, it's what stepper motors use, and we encounter those every day. > > Also, he didn't mention "mains" in that follow-up. > > Also, replying to pedantry with jackassery is lame. > (whereas the opposite is just plain fun ;-) actually there is an old place near me that uses 2 phase power./ Jamie
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| From | John S <Sophi.2@invalid.org> |
|---|---|
| Date | 2016-11-12 12:34 -0600 |
| Message-ID | <o07naa$33e$2@dont-email.me> |
| In reply to | #435117 |
On 11/12/2016 11:03 AM, M Philbrook wrote: > In article <xn60nt2y7f.fsf@delorie.com>, dj@delorie.com says... >> >> John S <Sophi.2@invalid.org> writes: >>>>> 2 phase? Please educate me on this. I know that single phase and 3 phase >>>>> are common, but I have never encountered 2 phase. >>>> >>>> really? >>>> >>>> two leads 90 degree shift.. >>> >>> How often have you encountered a mains supply with 90 degree phase >>> shift, smart ass? >> >> Nikolas Tesla invented it long ago. Just because it isn't used for >> mains *now* doesn't mean he can't know what it is. >> >> Also, it's what stepper motors use, and we encounter those every day. >> >> Also, he didn't mention "mains" in that follow-up. >> >> Also, replying to pedantry with jackassery is lame. >> (whereas the opposite is just plain fun ;-) > > actually there is an old place near me that uses 2 phase power./ > > Jamie > Does the old place generate its own power? The power company does not provide two phase power.
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| From | M Philbrook <jamie_ka1lpa@charter.net> |
|---|---|
| Date | 2016-11-12 16:20 -0500 |
| Message-ID | <MPG.329151c86d9cea08989f89@news.eternal-september.org> |
| In reply to | #435150 |
In article <o07naa$33e$2@dont-email.me>, Sophi.2@invalid.org says... > > On 11/12/2016 11:03 AM, M Philbrook wrote: > > In article <xn60nt2y7f.fsf@delorie.com>, dj@delorie.com says... > >> > >> John S <Sophi.2@invalid.org> writes: > >>>>> 2 phase? Please educate me on this. I know that single phase and 3 phase > >>>>> are common, but I have never encountered 2 phase. > >>>> > >>>> really? > >>>> > >>>> two leads 90 degree shift.. > >>> > >>> How often have you encountered a mains supply with 90 degree phase > >>> shift, smart ass? > >> > >> Nikolas Tesla invented it long ago. Just because it isn't used for > >> mains *now* doesn't mean he can't know what it is. > >> > >> Also, it's what stepper motors use, and we encounter those every day. > >> > >> Also, he didn't mention "mains" in that follow-up. > >> > >> Also, replying to pedantry with jackassery is lame. > >> (whereas the opposite is just plain fun ;-) > > > > actually there is an old place near me that uses 2 phase power./ > > > > Jamie > > > > Does the old place generate its own power? The power company does not > provide two phase power. Yes, they have both a water generation plant and scott connection transformers from commercial 3 phase to fill in when they need it. Jamie
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| From | pedro <me@privacy.net> |
|---|---|
| Date | 2016-11-13 09:32 +0800 |
| Message-ID | <9kgf2cle7giufjtq2hac5fuaerp2f7hndk@4ax.com> |
| In reply to | #435184 |
On Sat, 12 Nov 2016 16:20:58 -0500, M Philbrook <jamie_ka1lpa@charter.net> wrote: > Yes, they have both a water generation plant and scott connection >transformers from commercial 3 phase to fill in when they need it. Finally someone has mentioned Scott transformation. Beat me to it!
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| From | John S <Sophi.2@invalid.org> |
|---|---|
| Date | 2016-11-12 19:52 -0600 |
| Message-ID | <o08gvn$33e$7@dont-email.me> |
| In reply to | #435254 |
On 11/12/2016 7:32 PM, pedro wrote: > On Sat, 12 Nov 2016 16:20:58 -0500, M Philbrook > <jamie_ka1lpa@charter.net> wrote: > > >> Yes, they have both a water generation plant and scott connection >> transformers from commercial 3 phase to fill in when they need it. > > Finally someone has mentioned Scott transformation. Beat me to it! > But, according to Philbrick, two phase voltages are only 90 degrees apart. Three phases are 120 degrees apart. Please reconcile that discrepancy.
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| From | Jasen Betts <jasen@xnet.co.nz> |
|---|---|
| Date | 2016-11-13 05:11 +0000 |
| Message-ID | <o08sl9$ies$1@gonzo.alcatraz> |
| In reply to | #435259 |
On 2016-11-13, John S <Sophi.2@invalid.org> wrote: > On 11/12/2016 7:32 PM, pedro wrote: >> On Sat, 12 Nov 2016 16:20:58 -0500, M Philbrook >> <jamie_ka1lpa@charter.net> wrote: >> >> >>> Yes, they have both a water generation plant and scott connection >>> transformers from commercial 3 phase to fill in when they need it. >> >> Finally someone has mentioned Scott transformation. Beat me to it! >> > > But, according to Philbrick, two phase voltages are only 90 degrees > apart. Three phases are 120 degrees apart. Please reconcile that > discrepancy. Huh? That's what the scott transformer does. https://en.wikipedia.org/wiki/Scott-T_transformer -- This email has not been checked by half-arsed antivirus software
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| From | M Philbrook <jamie_ka1lpa@charter.net> |
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| Date | 2016-11-13 13:07 -0500 |
| Message-ID | <MPG.329275fc593a1733989f97@news.eternal-september.org> |
| In reply to | #435295 |
In article <o08sl9$ies$1@gonzo.alcatraz>, jasen@xnet.co.nz says... > > On 2016-11-13, John S <Sophi.2@invalid.org> wrote: > > On 11/12/2016 7:32 PM, pedro wrote: > >> On Sat, 12 Nov 2016 16:20:58 -0500, M Philbrook > >> <jamie_ka1lpa@charter.net> wrote: > >> > >> > >>> Yes, they have both a water generation plant and scott connection > >>> transformers from commercial 3 phase to fill in when they need it. > >> > >> Finally someone has mentioned Scott transformation. Beat me to it! > >> > > > > But, according to Philbrick, two phase voltages are only 90 degrees > > apart. Three phases are 120 degrees apart. Please reconcile that > > discrepancy. > > Huh? That's what the scott transformer does. > > https://en.wikipedia.org/wiki/Scott-T_transformer some people get easily confused. Two phase motors were good because you can run the motor the direction you need without using a starter phase or capactor and on top of that get the standard utility voltages for other items, two legs worth plus common. The 2 phase AC motor with slip ring motor to bring the rotor out for shorting via a rheostat was a good form a soft starting and speed regulation back then. Later you could get 3 phase motors working the same way, then they came out with Eddy current clutches, AC tachs as feed back. TUBE amps for the eddy current coils with the AC tach as the feed back to generate the pinch off voltage on the grid ;) I feel old. Jamie
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