Isolation transformer source
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From: Dave Plowman (News) on 14 Jun 2010 05:08 In article <wYidnYOdhZNaOYjRnZ2dnUVZ_hOdnZ2d(a)earthlink.com>, Michael A. Terrell <mike.terrell(a)earthlink.net> wrote: > "Dave Plowman (News)" wrote: > > > > In article <as-dnYa6P-Qth4nRnZ2dnUVZ_tSdnZ2d(a)earthlink.com>, Michael > > A. Terrell <mike.terrell(a)earthlink.net> wrote: > > > > If using a proper isolating transformer, there will be no > > > > reference to ground even with a 'live' chassis. The only way to > > > > get an electrical shock is to touch both outputs from the > > > > transformer. > > > > > Not true. You connect the chassis of the UUT to the test > > > equipment, so ANY voltage you contact inside the UUT is referenced > > > to ground. > > > > Why is the test equipment grounded? > Yawn... Why are people stupid? Yawn. You really do need to sort out how to work in a safe environment. All it needs is some common sense. Do you ground one side of a battery DVM too? -- *Why doesn't glue stick to the inside of the bottle? Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Phil Allison on 14 Jun 2010 08:44 "PeterD" > > Phil: consider it to be "self correcting" instead... ** If only that were true ... ... Phil
From: PeterD on 14 Jun 2010 08:44 On Mon, 14 Jun 2010 10:08:43 +0100, "Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: >In article <wYidnYOdhZNaOYjRnZ2dnUVZ_hOdnZ2d(a)earthlink.com>, > Michael A. Terrell <mike.terrell(a)earthlink.net> wrote: > >> "Dave Plowman (News)" wrote: >> > >> > In article <as-dnYa6P-Qth4nRnZ2dnUVZ_tSdnZ2d(a)earthlink.com>, Michael >> > A. Terrell <mike.terrell(a)earthlink.net> wrote: >> > > > If using a proper isolating transformer, there will be no >> > > > reference to ground even with a 'live' chassis. The only way to >> > > > get an electrical shock is to touch both outputs from the >> > > > transformer. >> > >> > > Not true. You connect the chassis of the UUT to the test >> > > equipment, so ANY voltage you contact inside the UUT is referenced >> > > to ground. >> > >> > Why is the test equipment grounded? > > >> Yawn... Why are people stupid? > >Yawn. You really do need to sort out how to work in a safe environment. >All it needs is some common sense. Do you ground one side of a battery DVM >too? Dang, you confirm stupidity... Amazing! Any test equipment DESIGNED to not be grounded isn't grounded. And test equipement that is designed to be grounded damned well better be grounded.
From: GregS on 14 Jun 2010 09:15 In article <51262e5c6ddave(a)davenoise.co.uk>, "Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: >In article <jqp6161lis3v93582a2p4q6g9212udvqpt(a)4ax.com>, > JW <none(a)dev.null> wrote: >> On Fri, 11 Jun 2010 10:30:56 +1000 "Phil Allison" <phil_a(a)tpg.com.au> >> wrote in Message id: <87dee7Fdj9U1(a)mid.individual.net>: > >> > >> >"JW" >> > >> >> Can anyone recommend a good isolation transformer for sale on-line? >> > >> >** What kind ?? >> > >> >There are two: >> > >> >1. Galvanic isolation - for use on a service bench. > >> Galvanic. Thanks - didn't realize there are different kinds. Don't want >> to kill myself! > >It certainly seems to me stupid to have the same name for different >devices like this. What is the point of an isolating transformer which >doesn't isolate? > Noise reduction. greg
From: GregS on 14 Jun 2010 09:18
In article <25q616l11jlnq0o0gtut5vu5p4el4fiscl(a)4ax.com>, JW <none(a)dev.null> wrote: >On Fri, 11 Jun 2010 08:24:36 -0500 Chuck <ch(a)deja.net> wrote in Message >id: <r7e416tt40mloqh91evegbjo9eb2qllqjk(a)4ax.com>: > >>On Thu, 10 Jun 2010 09:44:12 -0400, JW <none(a)dev.null> wrote: >> >>>Can anyone recommend a good isolation transformer for sale on-line? >>>Need one that will handle 5 amps or so at 120VAC, and have a standard AC >>>plug at the outlet. Prefer one for less than $100 or so, unless that seems >>>unreasonable. Found one at Mouser for $114 but that's only good for 1.25A. >>>Getting lots of irrelevant hits on google... >>> >>>Thanks. >> >> >>MCM Electronics has one. Chuck > >Thanks Chuck. Looking at these for the moment: >http://www.mcmelectronics.com/product/TRIPP-LITE--POWER-PROTECTION--IS500-/28-1 >0160 >http://www.mcmelectronics.com/product/TENMA-72-1097-/72-1097 The Tripp-Lite device has secondary attached to GROUND. This is NOT want you want. All Tripp-Lite supplies are attached to ground forming a new neutral to make a noise reduction device, period. I hope the second device has ground isolation. Greg |