Comments on: Define: EIA-310 http://www.server-racks.com/eia-310.html Information about rack issues and racking servers Tue, 06 Jan 2009 08:31:03 +0000 http://wordpress.org/?v=2.3.3 By: Alwyn Castelino http://www.server-racks.com/eia-310.html#comment-266 Alwyn Castelino Tue, 15 Jul 2008 14:04:19 +0000 http://www.server-racks.com/eia-310.html#comment-266 when US congress adapted they didnt clealy seen mfg facility available around the globe! so nobody belives in US standards as practice for more sophiticated work we can adapt 25.400050800101600203200406400813mm=1" but as we go do the enclosure or any panel work there its difficult to maintain the acuracy cheeerz when US congress adapted they didnt clealy seen mfg facility available around the globe! so nobody belives in US standards as practice for more sophiticated work we can adapt 25.400050800101600203200406400813mm=1″
but as we go do the enclosure or any panel work there its difficult to maintain the acuracy

cheeerz

]]> By: J Edelson http://www.server-racks.com/eia-310.html#comment-176 J Edelson Fri, 23 May 2008 18:58:48 +0000 http://www.server-racks.com/eia-310.html#comment-176 Not quite: As _currently_ defined, the inch is 2.54 cm _exactly_. When the US congress adopted the meter as the standard of measure (in the mid 1800's), it also adopted the standard that a yard was exactly 3600/3937 of a meter, which made the meter 39.37" and the mm 0.03937" as Joseph states. However in the mid 1900's the inch was _redefined_ to be 2.54 cm. This leads to there being two different definitions of the foot in common use. The 'survey foot' uses the old definition. Not quite:

As _currently_ defined, the inch is 2.54 cm _exactly_.

When the US congress adopted the meter as the standard of measure (in the mid 1800’s), it also adopted the standard that a yard was exactly 3600/3937 of a meter, which made the meter 39.37″ and the mm 0.03937″ as Joseph states.

However in the mid 1900’s the inch was _redefined_ to be 2.54 cm.

This leads to there being two different definitions of the foot in common use. The ’survey foot’ uses the old definition.

]]> By: Joseph B. Mattheeussen http://www.server-racks.com/eia-310.html#comment-71 Joseph B. Mattheeussen Tue, 08 Apr 2008 22:57:12 +0000 http://www.server-racks.com/eia-310.html#comment-71 Actually, the 'correct' mm to inch Conversion Standard is the inverse of .03937" (='s 1mm)... Therefore the EXACT inverse is actually: 25.400050800101600203200406400813, or 25.40005 for short!!! Multiply any 'inch' number by the Conversion factor of 25.40005 and you get the mm equivalent, and the opposite goes by dividing the 'X'mm number by the Conversion factor to get the actual inch equivalent... -Can you tell I'm a Design Eng'r?! Actually, the ‘correct’ mm to inch Conversion Standard is the inverse of .03937″ (=’s 1mm)… Therefore the EXACT inverse is actually: 25.400050800101600203200406400813, or 25.40005 for short!!! Multiply any ‘inch’ number by the Conversion factor of 25.40005 and you get the mm equivalent, and the opposite goes by dividing the ‘X’mm number by the Conversion factor to get the actual inch equivalent… -Can you tell I’m a Design Eng’r?!

]]> By: Craig McCluskey http://www.server-racks.com/eia-310.html#comment-13 Craig McCluskey Fri, 09 Nov 2007 16:41:34 +0000 http://www.server-racks.com/eia-310.html#comment-13 http://electronics.ihs.com/collections/abstracts/eia-310.htm says, Section 1 Description: This section is the soft metric conversion of the superseded EIA-310-C to conform with U.S. Public Law 100-418. I'm sure this means rounding off. It also says, Section 2 Description: This section is an adaptation of IEC 917 recommendations for Cabinets, Racks and Panels. It is compatible with the IEC 25 millimeter practices.... Whatever 25 millimeter practices are. Is that different than 25.4 mm = 1 inch? Craig http://electronics.ihs.com/collections/abstracts/eia-310.htm says,

Section 1
Description: This section is the soft metric conversion of the superseded EIA-310-C to
conform with U.S. Public Law 100-418.

I’m sure this means rounding off.

It also says,

Section 2
Description: This section is an adaptation of IEC 917 recommendations for Cabinets,
Racks and Panels. It is compatible with the IEC 25 millimeter practices….

Whatever 25 millimeter practices are. Is that different than 25.4 mm = 1 inch?

Craig

]]> By: Bob Mimlitch http://www.server-racks.com/eia-310.html#comment-6 Bob Mimlitch Sat, 27 Oct 2007 04:43:05 +0000 http://www.server-racks.com/eia-310.html#comment-6 Yep. 18.312" (18 5/16") = 165,10448mm. I'm sure they rounded it off. However, the EIA-301 RevD states 465mm. The older EIA-301 RevC uses 18 5/16" (18.312"), so you're both right. Yep. 18.312″ (18 5/16″) = 165,10448mm. I’m sure they rounded it off. However, the EIA-301 RevD states 465mm. The older EIA-301 RevC uses 18 5/16″ (18.312″), so you’re both right.

]]> By: Raul Cortes http://www.server-racks.com/eia-310.html#comment-5 Raul Cortes Fri, 26 Oct 2007 21:09:28 +0000 http://www.server-racks.com/eia-310.html#comment-5 Horizontal Spacing. 465 mm = 18.307". Regards! Horizontal Spacing. 465 mm = 18.307″.

Regards!

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