Re: [802.3_RTPGE] Update: Implications of Wire size on maximum available load power

["Darshan, Yair" <YDarshan@xxxxxxxxxxxxx>]

Geoff Sterling and all,

 

In the presentation you can find in page 18 a table with all the important parameters per wire size (diameter, area, resistance per meter etc.) which helps to pick the relevant information in terms of copper area or resistance per meter for this presentation.

The wire size used are just examples.

 

The purpose of the presentation was to show the implications of the wire size on available maximum power and what is matter is actually the wire resistance per meter so the reader can translate this information to any wire size method.

The differences between the methods are not so important for the illustration/calculation/evaluation of the maximum power available due to the fact that the calculations uses resistance per meter.

Once the wire resistance per meter is set, we can translate it to metric, AWG or any other existing method.

The point is to show how to calculate the real practical available power.

 

Yair

 

 

 

From: sterling [mailto:sterlingv@xxxxxxxxxxxxx]
Sent: Friday, July 20, 2012 2:36 AM
To: STDS-802-3-RTPGE@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_RTPGE] Update: Implications of Wire size on maximum available load power

 

Yes, the standard metric wire sizes are not equivalent to American wire gauges.

Sterling

On 7/19/2012 7:14 PM, Geoff Thompson wrote:

Sterling-

That is as I understand it
BUT (I believe) that the most commonly used sizes are not precisely equivalent to the commonly used sizes in an AWG environment.

Geoff

On 197//12 1:54 PM, sterling wrote:

Metric wire sizes are specified by the cross-sectional area in mm^2. American wire sizes are specified by a gauge that can be cross-referenced to a cross-sectional area.

In Europe at least, wire sizes are specified using the metric system.
 

On 7/19/2012 4:28 PM, Geoff Thompson wrote:

Yair-
I did not mean the cross sectional area in metric
I meant the wire sizes actually used in the auto industry world-wide.
I suspect those are based on metric sizes, not AWG

Geoff

On 197//12 11:44 AM, Darshan, Yair wrote:

Geoff,

 

Did you look at the updated presentation that I have sent yesterday (rev-001). In page 11 and 12 , right after the AWG wire size line, there is copper area in mm^2, is that what you meant is missing or the other parameter regarding the wire?

 

Yair

 

From: Geoff Thompson [mailto:thompson@xxxxxxxx]
Sent: Thursday, July 19, 2012 8:53 PM
To: Darshan, Yair
Cc: STDS-802-3-RTPGE@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_RTPGE] Update: Implications of Wire size on maximum available load power

 

Yair-
Your tables (pgs 11 & 12) should (at least) also include metric wire sizes (which I am assuming are used by most of the auto industry these days).  I know there are also Japanese wires sizes (also used by Korea).  I don't know if these show up in the auto industry.

Geoff

On 187//12 11:30 PM, Darshan, Yair wrote:

Updates:

-Adding wire area in addition to AWG.

- Minor editorial updates

 

----

Hi All,

 

Please see attached  short summary of the above issue.

I'll appreciate any comments.

Thanks

 

Yair

 

Darshan Yair

Chair

Power over HDBaseT Subcommittee

HDBaseT Alliance

 

Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation

 

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