An Old Dog,looking for answers,,,,,,,,,

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dicklaxt

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First let me tell you all a little about myself. I took my first formal training in electricity in1952 as a high school student,batteries and EMF were a big hobby for me at the time.I also studied a little bit of electronics while in the Air Force.

I was enrolled in a college drafting course in 1963 when a representitive from a large engineering company in Houston,Texas came to our classroom one day on a recruiting trip. To make a long story short I was fortunately one of the ones choosen to work for them.

I started out as a pipe draftsman but in just a few weeks the job I was working on was shutdown and I was really worried about my employment. I had a wife ,2 kids, a new car and a need a job. Once again I was fortunate I guess in that I was offered a temp position in the electrical drafting department cleaning up redmarks as drawings came out of the checking stage.That started my career and 44 years later I'm just and Old Phart still trying to learn.

I moved up thru the ranks and eventually became the Elect Design Manager and got away from the grind of drawings and NEC and spent the next 15 years pushing paper around and the knowledge I learned left and moved forward with technology and NEC changes.

I retired in the year 2000 but as most who suffer thru divorce,starting over,second marriage,more kids and college funding the money ran out. My wife and I are both on Social Security and she also has a small pension. We do get by but there is not anything for the extras we all have come to like.

I was asked to come in(from the company I retired from) and train some younger folks in electrical design because the advent of the computer age took away that intermediate step and most designers today are just keyboard button pushers with little knowledge learned in the school of hard knocks. I also do a little checking. The company offered me a 3 day week ,come and go as I please with my hours and work more if I desire and no one messes with me. What a sweet deal,work when I want ,fish when I want and you know what...... I still enjoy the grind,the pressure and a new challenge at 73 years of age..

I had asked a question in the NEC conferance of this Forum ,Titled How do you Interpret this or something close.......I know the limitations as stated in the 2008 NEC 300.3 (C)(2)(c) today but in the back of my mind I know or feel quite certain that the Code or some governing document I had worked with in the past allowed the control and/or associated cables of 5KV motors to be run in the same cable tray with the power conductors. In the older NEC,somewhere it states this I believe,I don't know when this may have changed. The article on Cable Tray was 318 at the time I think(now 392). I wished I had some old code books and could research this.

Moving forward,lets me say,save your money so you can stay retired when you get to be my age. I am still a high producer in getting it out the door and enjoy it but if I had lots of money I'd be down in the islands somewhere.

dick
 
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Smart $

Esteemed Member
Location
Ohio
dicklaxt said:
...I know the limitations as stated in the 2008 NEC 300.3 (C)2)(c) today but in the back of my mind I know or feel quite certain that the Code or some governing document I had worked with in the past allowed the control and/or associated cables of 5KV motors to be run in the same cable tray with the power conductors. In the older NEC,somewhere it states this I believe,I don't know when this may have changed. The article on Cable Tray was 318 at the time I think(now 392). I wished I had some old code books and could research this.
See 392.6(F).



Not 73, "but if I had lots of money I'd be down in the islands somewhere", too!!!
 
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dicklaxt

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Smart $,I had read that earlier but in addition the last sentence of 300.3 says the under 600v cable must be shielded,,,are we in this case calling the barrier a shield?,,looks like a conflict but I'm not sure.

dick
 
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dicklaxt

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Smart $,I had read that earlier but in addition the last sentence of 300.3 says the under 600v cable must be shielded,,,are we in this case calling the barrier a shield?,,looks like a conflict but I'm not sure or must/maybe both conditions be met?

dick
 
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dicklaxt

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TRhanks I'll give it a shot but believe it was prior to 2002 ,it may have carried over. I was retired at 2002.

dick
 
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dicklaxt

Guest
Found a couple of links must must be a NFPA member to have access to their pdf file
 

Smart $

Esteemed Member
Location
Ohio
dicklaxt said:
Smart $,I had read that earlier but in addition the last sentence of 300.3 says the under 600v cable must be shielded,,,are we in this case calling the barrier a shield?,,looks like a conflict but I'm not sure.

dick
No. It means "shielded conductors" or cables containing such. That is, each conductor must be individually shielded, regardless of any overall cable shielding. Additionally, that means all conductors regardless of insulation voltage rating.
 
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mivey

Senior Member
dicklaxt said:
Found a couple of links must must be a NFPA member to have access to their pdf file
You don't actually have to be a NFPA member, you just have to register and get a password. This is the case with many sites before they will let you download their info, or browse their whitepapers and such.
 
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