Comments on: Safety ground is not reliable ground reference http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/ All about electronics Thu, 09 Feb 2012 14:32:47 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: Lelah Takala http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-587225 Lelah Takala Sat, 05 Nov 2011 07:53:19 +0000 http://www.epanorama.net/blog/?p=229#comment-587225 Needed to put you one bit of word in order to give many thanks again for these marvelous solutions you have featured on this site. It's strangely generous of people like you to present publicly just what many of us might have offered for an e-book in order to make some profit for their own end, mostly given that you could have done it if you considered necessary. These points in addition worked like the great way to understand that many people have the same zeal like my own to learn great deal more in terms of this matter. I am sure there are thousands of more enjoyable opportunities ahead for individuals who start reading your blog post. Needed to put you one bit of word in order to give many thanks again for these marvelous solutions you have featured on this site. It’s strangely generous of people like you to present publicly just what many of us might have offered for an e-book in order to make some profit for their own end, mostly given that you could have done it if you considered necessary. These points in addition worked like the great way to understand that many people have the same zeal like my own to learn great deal more in terms of this matter. I am sure there are thousands of more enjoyable opportunities ahead for individuals who start reading your blog post.

]]> By: columna de horoscopo http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-559210 columna de horoscopo Wed, 19 Oct 2011 15:06:23 +0000 http://www.epanorama.net/blog/?p=229#comment-559210 I am not sure where you're getting your info, however good topic. I must spend some time learning much more or figuring out more. Thanks for excellent information I was in search of this info for my mission. I am not sure where you’re getting your info, however good topic. I must spend some time learning much more or figuring out more. Thanks for excellent information I was in search of this info for my mission.

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]]> By: tomi http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-241539 tomi Mon, 11 Apr 2011 08:32:28 +0000 http://www.epanorama.net/blog/?p=229#comment-241539 The blog is tested to work well with Firefox (at least the most recent versions). Firefox is my favorite web browser. The blog is tested to work well with Firefox (at least the most recent versions).
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]]> By: Dwight Escalera http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-240716 Dwight Escalera Mon, 11 Apr 2011 03:00:31 +0000 http://www.epanorama.net/blog/?p=229#comment-240716 Hi there just wanted to give you a quick heads up. The text in your post seem to be running off the screen in Firefox. I'm not sure if this is a format issue or something to do with internet browser compatibility but I thought I'd post to let you know. The design look great though! Hope you get the issue resolved soon. Many thanks Hi there just wanted to give you a quick heads up. The text in your post seem to be running off the screen in Firefox. I’m not sure if this is a format issue or something to do with internet browser compatibility but I thought I’d post to let you know. The design look great though! Hope you get the issue resolved soon. Many thanks

]]> By: tomi http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-116162 tomi Wed, 15 Dec 2010 13:41:40 +0000 http://www.epanorama.net/blog/?p=229#comment-116162 In data communications, the primary application for optical isolation is in a point-to-point data circuit that covers a distance of several hundred feet or more. Because the connected devices are presumably on different power circuits, a ground potential difference likely exists between them. When such a condition exists, the voltage of "ground" can be different, sometimes by several hundred volts. Where a ground potential difference exists, a phenomenon called ground looping can occur. In this phenomenon, current will flow along the data line in an effort to equalize the ground potential between the connected devices. Ground looping can, at the very least, severely garble communications--if not damage hardware! Optical isolation solves the problem of ground looping by effectively lifting the connection between the data line and "ground" at either end of the line. If an optically coupled connection exists at each end, the data traffic "floats" above the volatility of ground potential differences. If the voltage potential is large enough, your equipment will not be able to handle the excess voltage, and one of your ports will be damaged. Even small ground loop voltages cause transmission errors with data signals riding on top of the ground loop current. At worst, ground loops are a long-term condition that can slowly heat, and even cook your circuits. Source: http://www.usconverters.com/index.php?main_page=page&id=20&chapter=0 Some links http://www.usconverters.com/index.php?main_page=page&id=20&chapter=0 http://www.bb-elec.com/productsubcat.asp?MainCategoryId=4&Trail=2&TrailType=Top http://www.digi.com/products/serialservers/digiconnectes.jsp#overview http://www.moxa.com/product/tcc-82.htm http://www.moxa.com/product/tcc-100.htm http://www.datasheetarchive.com/RS232%20isolation-datasheet.html http://www.supplyframe.com/partsearchservlet/partnerWormhole.action?id=2835057&partnerName=DSA In data communications, the primary application for optical isolation is in a point-to-point data circuit that covers a distance of several hundred feet or more. Because the connected devices are presumably on different power circuits, a ground potential difference likely exists between them. When such a condition exists, the voltage of “ground” can be different, sometimes by several hundred volts.
Where a ground potential difference exists, a phenomenon called ground looping can occur. In this phenomenon, current will flow along the data line in an effort to equalize the ground potential between the connected devices. Ground looping can, at the very least, severely garble communications–if not damage hardware!
Optical isolation solves the problem of ground looping by effectively lifting the connection between the data line and “ground” at either end of the line. If an optically coupled connection exists at each end, the data traffic “floats” above the volatility of ground potential differences.
If the voltage potential is large enough, your equipment will not be able to handle the excess voltage, and one of your ports will be damaged. Even small ground loop voltages cause transmission errors with data signals riding on top of the ground loop current. At worst, ground loops are a long-term condition that can slowly heat, and even cook your circuits.
Source: http://www.usconverters.com/index.php?main_page=page&id=20&chapter=0

Some links
http://www.usconverters.com/index.php?main_page=page&id=20&chapter=0
http://www.bb-elec.com/productsubcat.asp?MainCategoryId=4&Trail=2&TrailType=Top
http://www.digi.com/products/serialservers/digiconnectes.jsp#overview
http://www.moxa.com/product/tcc-82.htm
http://www.moxa.com/product/tcc-100.htm
http://www.datasheetarchive.com/RS232%20isolation-datasheet.html
http://www.supplyframe.com/partsearchservlet/partnerWormhole.action?id=2835057&partnerName=DSA

]]> By: sondownder http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-115563 sondownder Wed, 15 Dec 2010 03:32:04 +0000 http://www.epanorama.net/blog/?p=229#comment-115563 "Traditional RS-232 or RS-485 or RS-422 can be made to withstand this voltage if you take case that the equipment on one of the ends of the communications link or both of them have the communications port electrically isolated (usually uses optioisolators) from the equipment case." Where else can I read about it? “Traditional RS-232 or RS-485 or RS-422 can be made to withstand this voltage if you take case that the equipment on one of the ends of the communications link or both of them have the communications port electrically isolated (usually uses optioisolators) from the equipment case.”
Where else can I read about it?

]]> By: tomi http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-86504 tomi Wed, 10 Nov 2010 11:15:38 +0000 http://www.epanorama.net/blog/?p=229#comment-86504 Just buying high quality power strips does not solve all the problems listed on my article... Just buying high quality power strips does not solve all the problems listed on my article…

]]> By: Bedding Collections · http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-85755 Bedding Collections · Tue, 09 Nov 2010 19:12:44 +0000 http://www.epanorama.net/blog/?p=229#comment-85755 just buy high quality power strips and do not use power strips that are not UL certified ` just buy high quality power strips and do not use power strips that are not UL certified `

]]> By: Liam Martin http://www.epanorama.net/blog/2009/06/26/safety-ground-is-not-reliable-ground-reference/comment-page-2/#comment-59819 Liam Martin Tue, 05 Oct 2010 19:07:10 +0000 http://www.epanorama.net/blog/?p=229#comment-59819 power strips are very useful but they octopus connection is dangerous;~* power strips are very useful but they octopus connection is dangerous;~*

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