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Electrical testing - May I share my "rookie" mistake?

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  • Member since
    August 2002
  • From: Womelsdorf
  • 756 posts
Posted by HEdward on Friday, October 26, 2007 6:11 PM
 TwinDaddy66 wrote:

The cat story got a chuckle out of me as I have had the same problem with our cat. I have never seen an animal that has such a fetish with electrical wiring. I have had to splice every speaker wire on the home theater (twice), the playstation, the kids v-smile game (twice), a waterfall light in the bedroom, my computer mouse cable and even the clothes iron cord which he chewed in two as the wife was ironing!! He never did that again! (picture the movie christmas vacation when the cat chewed the tree light cord) Ya'll say "get rid of the cat..." my wife says "NO".

cheers...

John

 

Our dog chewed Mom's sweing machine pedal cable.  It was connected to a switched outlet that went on with the light at the stairs.  I was on my way to my trains(gee this story goes back a lonnnggggg way)and when I hit the light switch, the power came on and the sewing machine raced at full speed!  I was just old enough to know how to fix it.

Oddly, the cats don't bother with power cords or speaker wires.  The light weight wires used under my last layout were just dangling too much.  My new layout(s) have to be cat, kid and wife proof.(see other threads)

Proud to be DD-2itized! 1:1 scale is too unrealistic. Twins are twice as nice!
  • Member since
    April 2007
  • From: Iowa
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Posted by Semper Vaporo on Friday, October 26, 2007 4:55 PM
 TwinDaddy66 wrote:

The cat story got a chuckle out of me as I have had the same problem with our cat. I have never seen an animal that has such a fetish with electrical wiring. I have had to splice every speaker wire on the home theater (twice), the playstation, the kids v-smile game (twice), a waterfall light in the bedroom, my computer mouse cable and even the clothes iron cord which he chewed in two as the wife was ironing!! He never did that again! (picture the movie christmas vacation when the cat chewed the tree light cord) Ya'll say "get rid of the cat..." my wife says "NO".

cheers...

John

That cat will eventually get rid of itself... hopefully it won't take your house with it.

Semper Vaporo

Pkgs.

  • Member since
    April 2003
  • 305,205 posts
Posted by Anonymous on Friday, October 26, 2007 3:10 PM

The cat story got a chuckle out of me as I have had the same problem with our cat. I have never seen an animal that has such a fetish with electrical wiring. I have had to splice every speaker wire on the home theater (twice), the playstation, the kids v-smile game (twice), a waterfall light in the bedroom, my computer mouse cable and even the clothes iron cord which he chewed in two as the wife was ironing!! He never did that again! (picture the movie christmas vacation when the cat chewed the tree light cord) Ya'll say "get rid of the cat..." my wife says "NO".

cheers...

John

  • Member since
    October 2005
  • From: Detroit, Michigan
  • 2,284 posts
Posted by Soo Line fan on Friday, October 26, 2007 11:41 AM

I got into an argument with another forum member about electrical troubleshooting, something I do for a living. This Dunce [D)] could not fathom that the many blocks a DC layout has is an advantage when troubleshooting a short circuit.

The blocks make it real simple to break up a layout into many small pieces instead of looking "somewhere" for a short.

The DCC guys would do well if they included some toggles to breakup their layouts as well.

The toggles would not even have to be run back to a control panel, they could be placed under the layout in strategic areas.

Some may say shorts will never occur unless an engine derails but the rest of us know better. It can and does happen.

Jim

Jim

  • Member since
    November 2002
  • From: Colorado
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Posted by fwright on Friday, October 26, 2007 10:39 AM

My favorite boo-boo - and I've done it more than once - is putting a locomotive or car on which I have just installed Kadee couplers on to the layout for testing.  Of course, there is absolutely no track power, and any selected power source shows a short circuit.  Search for hours, can't find anything wrong.  Desperately remove the Kadee couplers in an effort to find the short, but it's still there.  Reinstall the couplers, take the locomotive/car over to the front spur to check the coupler height against the Kadee coupler height gauge one more time.  And then - the blinding  obvious hits me - that metal coupler height gauge is happily short circuiting any power I apply to the track.

Because I've done it more than once, making sure the coupler height gauge is off the layout is now one of the first steps in my short circuit trouble-shooting.

wishing I would get struck by the blinding obvious much earlier in my efforts...

Fred W 

  • Member since
    August 2002
  • From: Womelsdorf
  • 756 posts
Posted by HEdward on Friday, October 26, 2007 10:20 AM
Having worked with electronics hobbyists and rebuilt my old 4x8 a zillion times, wiring the layout is no problem for me.  My last layout, two 4x8 set up as an L, was going to be completely wired and running in about two hours.  With everything wired exactly as planned, I left fo dinner.  Upon returning, it was time to grab my least favorite loco and check everything.  NOTHING WORKED!  I searched here, there, everywhere!  After tracing each lead from the control panel to the rails and back again, I finally found the problem.  One of our two cats had decided to hop onto the layout and play with anything it could, knocking a small screwdriver off the edge of the layout and into the back of the panel, shorting out by a fraction of an inch the terminals of one of the power packs.  Solution?  After reseting the circuit breaker, a small piece of electrical tape over the terminals so no more accidents can happen, and no more leaving the brass handled screwdriver laying around!  The yard turnouts failed the following week. Guess waht?  Cats found the unprotected wiring hanging from the underside of the layout and pulled the common lead out.  Solution?  Solder the connection, and staple the single wires tight to the underside of the table.  Extra solution, close the door even when I was in the room keeping the cats out at all times.  I learned my electrical basics from (ok, it's not a Kalmbach book) the Atlas wiring book as published back in the late 1960's.  There were no cat related warnings in the book.  :(
Proud to be DD-2itized! 1:1 scale is too unrealistic. Twins are twice as nice!
  • Member since
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  • From: Iowa
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Posted by Semper Vaporo on Thursday, October 25, 2007 4:04 PM

This is not toy train oriented and not even a "Rookie" mistake... but I'll share it anyway...

I was helping my son-in-law install a GFCI outlet in their kitchen (old house).  Unfortunately, I got there after he had removed the original outlet and could only see 4 wires sticking out of the wall box and no way of knowing which one was which, all were black and coming in separate holes in the old metal box.  I got my old, trusty Simpson VOM and put it on AC Volts to look for power on any wire, just in case the wrong fuse had been pulled.  Found none, so I felt safe to switch to Ohms to try to see which wire was "ground" from the power box.  THREE of the four seemed to be ground.  I figured some item was probably plugged into an outlet downstream. Went to the lamp on what I thought was the next outlet in the chain.

The VOM needle is now in the shape of a questionmark ("?") and all the smoke got let out of the coil in the meter!  I had left the meter in Ohms and the outlet was not on the same circuit as the one we were working on and 120 Volt power surged right through that poor ol' meter... POW!

I bought that meter with the entirety of my very first paycheck... all $18.75 of it in 1963.  (I miss my meter!)

 

Semper Vaporo

Pkgs.

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  • From: Colorful Colorado
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Posted by Gandy Dancer on Thursday, October 25, 2007 2:29 PM
I saw that puchline a coming!
  • Member since
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  • From: Southeast Texas
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Posted by mobilman44 on Thursday, October 25, 2007 1:13 PM

Gosh, I've been there, done that too!!!

Seriously, the worst electrical problem I've had that eluded me for the longest time was the staple that secured two wires underneath the layout.  Initally it did not short, but did so after time due to some other wiring project that pulled those wires allowing the staple to cut into both of them.  That was a real job in figuring that out, even to the point of chasing me out of the train room for days at a time.  Once I found it, ALL staples were removed and the standard "eye" connectors were put into place.  Like they say, an ounce of prevention is worth a pound of cure!

ENJOY,

Mobilman44

ENJOY  !

 

Mobilman44

 

Living in southeast Texas, formerly modeling the "postwar" Santa Fe and Illinois Central 

  • Member since
    September 2002
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Posted by ndbprr on Thursday, October 25, 2007 10:41 AM
Wait until you  hook up a siwtch solenoid with the common on one end instead of the center.  Every time you throw it it goes the same way.  That one takes a couple of hours to figure out after you have changed the solenoid and rewired it the same way because you know you did it right.  It has to be defective parts.
  • Member since
    February 2005
  • From: Southwest US
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Posted by tomikawaTT on Thursday, October 25, 2007 9:33 AM

Howdy, Pardner,

After reading of your misadventure, I have but one thing to say:

Been there, done that. Laugh [(-D]

Don't you wish all of your problems were that hard to solve? Whistling [:-^]

Chuck (modeling Central Japan in September, 1964 - analog DC, MZL system)

  • Member since
    September 2003
  • From: Southeast Texas
  • 5,449 posts
Electrical testing - May I share my "rookie" mistake?
Posted by mobilman44 on Thursday, October 25, 2007 9:13 AM

Good Morning,

Hope you enjoy the following, which I can laugh at this morning - but sure wasn't laughing about it yesterday........

Last evening, I was "fixin to" wire up two sets of industrial sidings on my 3 level,15x11 Ho DC layout.  I use two Controlmaster 20s, and have about 28 blocks on the layout.  I am not an electrician, but I know DC wiring pretty well.............

Anyway, I intended for one of the groups of sidings to be a single block, but felt that it needed two sets of leads to assure there was no voltage drop from one siding to the other.  I ran the first lead and tested to assure the direction of a loco on said siding was consistent with other powered tracks, and then left the loco on the siding and shut off the power.  So far, so good..

Well, then I spliced in two more leads and threaded them thru the benchwork to the far side of the siding complex.  Usually, I wire the black (common) wire to the far rail and red (hot) to the near rail.  Instead of "just doing it", I decided to check for the "right" rail by using a connectivity (spell?) tester.  As most of you know, this is simply two long leads with a battery/bulb in the center.

Well, I connected one lead to the black wire and touched the far rail with the other.  Well, as expected, the test bulb glowed brightly.  And then, just for grins, I touched the inner rail - and guess what, the bulb glowed again (although not as bright).  Well, Mr. Edison here figured that I somehow had shorted out the siding complex, and the hunt was on............

I looked for tools on the tracks, and traced the few connected wires, and even assured that the sidings were isolated from the main.  Yes, everthing was as it should be, but the "short" was still there.  I then recalled that once I stapled some wiring under the layout and the staple cut thru the wires and caused a short, but I have not used staples since that time.

Well, then it hit me...........  The loco I used to test polarity of the siding was still on the siding.  And of course, current from one rail will flow thru the motor to the other side, giving the appearance of a short when using the connectivity tester............

Hey, hope you enjoyed, and maybe a few learned from my mistake.   I suspect I'm not the "lone ranger" here, so how about sharing your "learning experiences"?

ENJOY,

Mobilman44

ENJOY  !

 

Mobilman44

 

Living in southeast Texas, formerly modeling the "postwar" Santa Fe and Illinois Central 

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