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Stephen Earley

Cable identification - there’s more to it than meets the eye

Stephen Earley
Victor Lorenzo
Victor Lorenzo
9/22/2017 5:44:08 PM
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Color coding
Cable labeling is extremenly useful for maintenance, troubleshooting and wiring. And color coding is also of great help. I use color coding extensively and saves me a lot of time.

But talking about colors brings me back one more "lesson from the trash can" I was planning to talk about: human abilities and disabilities. Some time ago while I was working for another company they hired one apprentice for wiring one machine that we were working on. We used a bunch of cables for connecting tens of sensors and actuators. Many cables were coded using color combinations (blue-red-black on white, to name one combination).

Nothing worked! Why? The apprentice was not able to see the lady, ;P, in this picture below:



Surprisingly, He didn't know about his condition.

 

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Bill_Jaffa
Bill_Jaffa
9/22/2017 12:13:15 PM
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Re: Cabling
Yes, "Cabling Installation and Maintenance" is a great publication -- keeps you up-to-date on latest in standards, proposed standards, and real-world practical issues such as PoE cables overheating in packed cable trays due to their own and neighbor-cable I2R drop self-heating and lack of airflow, thus causing dangerous conditions, and what the standards say about that (you would be suprised).

Also looks at serious issues with counterfeitt cables which do not have required electrical properites to support the data rate claimed, or which fail their claimed fire-safety ratings (in one case, all the comm cables had to be ripped out and redone, per orer of fire marshal and buikding inspector).

And also has a sense of humor, to, with photos of absolutely worst nightmare "rat's nest" installations their readers have seen--some at "high-end" offices or facilties!

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steve.taranovich
steve.taranovich
9/21/2017 10:38:11 PM
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Re: Cabling
@antedeluvian----Thanks for that information about the cabling magazine---interesting, but I guess there are a great deal of options regarding aspects of cable and wire.

How can print magazines make money nowadays? I do love print and I still read paper magazines and books, but I understand why magazines are going away from paper;however, I am not happy about that. It's a business decision I guess

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antedeluvian
antedeluvian
9/21/2017 10:10:04 AM
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Cabling
As Steve says in his note at the beginning, we engineers often fail to take into account that our systems are part of a greater whole and must be interconnected. There is a magzaine dedicated to this subject "Cabling Installation and Maintenance" which is surprising on two counts. First that there are still magazines and secondly because it is such a narrow subject.

I might add that I did a blog on a different aspect of cabling "Tidy Your Wiring". I must admit that I didn't deal with the topic of labelling, so Stephen, thanks for this blog.

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