Date   

Re: Reversing Section Wiring question

Blair & Rasa
 

I'll try to post it later.  Yahoo won't let me post it, for some reason.

B


On 2017-12-06 14:43, Blair & Rasa smithbr@... [WiringForDCC] wrote:

Don

In my original email, I described traffic as follows:

"A train from the junction will visit the sinter mill once daily, arriving by the lower track at right... Generally, all or a portion of the arriving train proceeds straight to the harbour scene, via the track at upper right... The train then returns to the sinter mill, where things get interesting."

So what isn't clear?  trains arrive lower right, exit to harbour,  and return, via upper right.  I didn't say it, but scale is HO, the grid is 12"; trains are expected to consist of 4 SD40-2 units plus 25 +/-  Ortner ore cars (6" ea), for a typical length around 15 feet.  Surely the visual ratio of switch lengths to track lengths gives you some idea of the constraints?  If a track is 4x the length of a switch, in HO or N, or likely G,  the track probably holds 6-8 cars, depending on car length and switch size obviously. 

The issue is, depending upon how one switches that center diagonal track pair, one can easily end up bridging from normal-power main to the reversing section at both ends of the train, even with the augmented large reversing section as depicted.  
But maybe I've found it.  See my new posting to files.  I think this works, satisfying the longest possible trains.  I added clarification info where necessary.

Blair Smith




On 2017-12-06 13:37, 'Vollrath, Don' don.vollrath@... [WiringForDCC] wrote:
Your operating description is a little hard to follow as there are no location names shown on the track sketch.
Also not sure if it is drawn to any scale or if there are other track extensions off to the right of either the upper or lower black stub tracks. Your saving grace is that the plan is to move only one train at a time. The only possible hooker is if you leave a steel wheeled car stuck in a gap at one end while you move the loco out the other end. The fix for that is to make track gaps large enough and fill them with plastic shaped to the railhead so that a steel wheel can never touch both sides of the gap at the same time. A loco is then free to traverse the gaps at the other end and let the A-R unit to do its thing. 

On my home layout I got tired of playing with relay or track switched reversing controllers and put in an OGAR. It auto-polarity trips at ~4 amps and acts as a circuit breaker in the case of derailment. Works like a charm from my 5 amp booster. No headlight blinks or sound disturbances at either end.

DonV  

-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...] 
Sent: Wednesday, December 06, 2017 11:19 AM
To: WiringForDCC@...
Subject: Re: [WiringForDCC] Reversing Section Wiring question

Thanks, Don.  That was my thinking; since the A/D train will often be longer than the green, it makes sense to make the green plus red all one large autoreversing section.  Consists will often be 4 SD40-2 units, lead and trailing units sound equipped, so a relay reverser doesn't really cut it, unless one puts up with the sound resets, or outfits all applicable locos with keep-alive addons to avoid the resets, or artificially restricts the use of the switch at the lower right so that it never needs changing with sound units in the reversing section.  Not prototypical, as they arrived by running LH through that switch, but departed through the RH position after switching the harbour, then the sinter plant.

It does remain a little hairy, however, when I think about all the possible switching patterns, and whether they're adequately covered off by the large reverser.  I'll have to think it through a bit more, and if I see an exposed reversing scenario, I'll be back.

Thanks, both of you

Blair




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Re: Reversing Section Wiring question

Blair & Rasa
 

Don

In my original email, I described traffic as follows:

"A train from the junction will visit the sinter mill once daily, arriving by the lower track at right... Generally, all or a portion of the arriving train proceeds straight to the harbour scene, via the track at upper right... The train then returns to the sinter mill, where things get interesting."

So what isn't clear?  trains arrive lower right, exit to harbour,  and return, via upper right.  I didn't say it, but scale is HO, the grid is 12"; trains are expected to consist of 4 SD40-2 units plus 25 +/-  Ortner ore cars (6" ea), for a typical length around 15 feet.  Surely the visual ratio of switch lengths to track lengths gives you some idea of the constraints?  If a track is 4x the length of a switch, in HO or N, or likely G,  the track probably holds 6-8 cars, depending on car length and switch size obviously. 

The issue is, depending upon how one switches that center diagonal track pair, one can easily end up bridging from normal-power main to the reversing section at both ends of the train, even with the augmented large reversing section as depicted.  
But maybe I've found it.  See my new posting to files.  I think this works, satisfying the longest possible trains.  I added clarification info where necessary.

Blair Smith




On 2017-12-06 13:37, 'Vollrath, Don' don.vollrath@... [WiringForDCC] wrote:
Your operating description is a little hard to follow as there are no location names shown on the track sketch.
Also not sure if it is drawn to any scale or if there are other track extensions off to the right of either the upper or lower black stub tracks. Your saving grace is that the plan is to move only one train at a time. The only possible hooker is if you leave a steel wheeled car stuck in a gap at one end while you move the loco out the other end. The fix for that is to make track gaps large enough and fill them with plastic shaped to the railhead so that a steel wheel can never touch both sides of the gap at the same time. A loco is then free to traverse the gaps at the other end and let the A-R unit to do its thing. 

On my home layout I got tired of playing with relay or track switched reversing controllers and put in an OGAR. It auto-polarity trips at ~4 amps and acts as a circuit breaker in the case of derailment. Works like a charm from my 5 amp booster. No headlight blinks or sound disturbances at either end.

DonV  

-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...] 
Sent: Wednesday, December 06, 2017 11:19 AM
To: WiringForDCC@...
Subject: Re: [WiringForDCC] Reversing Section Wiring question

Thanks, Don.  That was my thinking; since the A/D train will often be longer than the green, it makes sense to make the green plus red all one large autoreversing section.  Consists will often be 4 SD40-2 units, lead and trailing units sound equipped, so a relay reverser doesn't really cut it, unless one puts up with the sound resets, or outfits all applicable locos with keep-alive addons to avoid the resets, or artificially restricts the use of the switch at the lower right so that it never needs changing with sound units in the reversing section.  Not prototypical, as they arrived by running LH through that switch, but departed through the RH position after switching the harbour, then the sinter plant.

It does remain a little hairy, however, when I think about all the possible switching patterns, and whether they're adequately covered off by the large reverser.  I'll have to think it through a bit more, and if I see an exposed reversing scenario, I'll be back.

Thanks, both of you

Blair




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Posted by: Blair & Rasa 
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Posted by: "Vollrath, Don" 
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Re: Reversing Section Wiring question

Vollrath, Don <don.vollrath@...>
 

Your operating description is a little hard to follow as there are no location names shown on the track sketch.
Also not sure if it is drawn to any scale or if there are other track extensions off to the right of either the upper or lower black stub tracks. Your saving grace is that the plan is to move only one train at a time. The only possible hooker is if you leave a steel wheeled car stuck in a gap at one end while you move the loco out the other end. The fix for that is to make track gaps large enough and fill them with plastic shaped to the railhead so that a steel wheel can never touch both sides of the gap at the same time. A loco is then free to traverse the gaps at the other end and let the A-R unit to do its thing.

On my home layout I got tired of playing with relay or track switched reversing controllers and put in an OGAR. It auto-polarity trips at ~4 amps and acts as a circuit breaker in the case of derailment. Works like a charm from my 5 amp booster. No headlight blinks or sound disturbances at either end.

DonV

-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...]
Sent: Wednesday, December 06, 2017 11:19 AM
To: WiringForDCC@...
Subject: Re: [WiringForDCC] Reversing Section Wiring question

Thanks, Don.  That was my thinking; since the A/D train will often be longer than the green, it makes sense to make the green plus red all one large autoreversing section.  Consists will often be 4 SD40-2 units, lead and trailing units sound equipped, so a relay reverser doesn't really cut it, unless one puts up with the sound resets, or outfits all applicable locos with keep-alive addons to avoid the resets, or artificially restricts the use of the switch at the lower right so that it never needs changing with sound units in the reversing section.  Not prototypical, as they arrived by running LH through that switch, but departed through the RH position after switching the harbour, then the sinter plant.

It does remain a little hairy, however, when I think about all the possible switching patterns, and whether they're adequately covered off by the large reverser.  I'll have to think it through a bit more, and if I see an exposed reversing scenario, I'll be back.

Thanks, both of you

Blair




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Posted by: Blair & Rasa <smithbr@...>
------------------------------------

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------------------------------------

Yahoo Groups Links


Re: Reversing Section Wiring question

Blair & Rasa
 

Thanks, Don.  That was my thinking; since the A/D train will often be longer than the green, it makes sense to make the green plus red all one large autoreversing section.  Consists will often be 4 SD40-2 units, lead and trailing units sound equipped, so a relay reverser doesn't really cut it, unless one puts up with the sound resets, or outfits all applicable locos with keep-alive addons to avoid the resets, or artificially restricts the use of the switch at the lower right so that it never needs changing with sound units in the reversing section.  Not prototypical, as they arrived by running LH through that switch, but departed through the RH position after switching the harbour, then the sinter plant.

It does remain a little hairy, however, when I think about all the possible switching patterns, and whether they're adequately covered off by the large reverser.  I'll have to think it through a bit more, and if I see an exposed reversing scenario, I'll be back.

Thanks, both of you

Blair


Re: Reversing Section Wiring question

Vollrath, Don <don.vollrath@...>
 

Blair,
Clearly the Green section of track is a reversing section. It has three entrances.

If all trains will always be shorter than the Green section simply make the Green section an auto-reversing track. Wire the Red track sections the same constant polarity as shown in black.

If train length can span the entire Green section, then wire up all of the Red tracks as part of the Green auto-reversing section.

Since you will be moving only one train at a time there is no real penalty for having an extended length of reversing section.

DonV

-----Original Message-----
From: WiringForDCC@... [mailto:WiringForDCC@...]
Sent: Tuesday, December 05, 2017 5:23 PM
To: WiringForDCC@...
Subject: [WiringForDCC] Reversing Section Wiring question

Hi Folks

I've placed "Wawa_Reversing.jpg" in the files section.  The background is:

The layout is HO, with Digitrax DCC.  This is a sinter mill scene.  A train from the junction will visit the sinter mill once daily, arriving by the lower track at right.  It brings empty ore cars from the steel mill, and occasionally other items, such as plant equipment, additives for the sinter, fuel for the fuel dealer, propane for the propane dealer, log empties for the pulpwood spur, etc. etc.  Generally, all or a portion of the arriving train proceeds straight to the harbour scene, via the track at upper right.  At the harbour, the train drops empties and picks up loads of limestone, coke, and sometimes ore.  Empty fuel tankcars are exchanged for loads at the oil terminal.  The train then returns to the Sinter mill, where things get interesting.

What I'm looking for, though, is just a wiring suggestion.  The section in green clearly needs to be a reversing section, and with three points of entry it can't be based on the position of a single turnout, so should be an automated reverser.  Some trains, however, will be long enough to bridge the short section of reversing track across the top. I'm considering whether to just flip the whole darn branch to the harbour, as well as the rest of the trackage, as shown in red.  I can't see a down side to doing this.  There will only ever be one train operating on the branch, so only one consist.  However, all cars will have metal wheels, meaning there will be the potential for simultaneous reversal need at both ends of a reversing section.

Suggestions?

Blair Smith



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Yahoo Groups Links


Re: Reversing Section Wiring question

Puckdropper
 

Take a look at that tail track on the right-hand side of the green.  That can be wired to a switch machine to avoid needing a reverser there.

Now, take a look at the lower section in red.  I'd probably put my autoreverser there, depending on how long the area actually is.

If you want a longer reversing section, you may consider putting part of the yard ladder on the reverser and doing the entire loop.  Even though you have what look like multiple entrances to the reversing section, only one can be used at a time.  You always need to stay off the switch to prevent shorts.

I have not analyzed the track plan in detail, so I might have missed something.  Please take these for what they are: ideas.

Puckdropper

---In wiringfordcc@..., <smithbr@...> wrote :

Hi Folks

I've placed "Wawa_Reversing.jpg" in the files section.  The background is:

The layout is HO, with Digitrax DCC.  This is a sinter mill scene.  A
train from the junction will visit the sinter mill once daily, arriving
by the lower track at right.  It brings empty ore cars from the steel
mill, and occasionally other items, such as plant equipment, additives
for the sinter, fuel for the fuel dealer, propane for the propane
dealer, log empties for the pulpwood spur, etc. etc.  Generally, all or
a portion of the arriving train proceeds straight to the harbour scene,
via the track at upper right.  At the harbour, the train drops empties
and picks up loads of limestone, coke, and sometimes ore.  Empty fuel
tankcars are exchanged for loads at the oil terminal.  The train then
returns to the Sinter mill, where things get interesting.

What I'm looking for, though, is just a wiring suggestion.  The section
in green clearly needs to be a reversing section, and with three points
of entry it can't be based on the position of a single turnout, so
should be an automated reverser.  Some trains, however, will be long
enough to bridge the short section of reversing track across the top. 
I'm considering whether to just flip the whole darn branch to the
harbour, as well as the rest of the trackage, as shown in red.  I can't
see a down side to doing this.  There will only ever be one train
operating on the branch, so only one consist.  However, all cars will
have metal wheels, meaning there will be the potential for simultaneous
reversal need at both ends of a reversing section.

Suggestions?

Blair Smith


Reversing Section Wiring question

Blair & Rasa
 

Hi Folks

I've placed "Wawa_Reversing.jpg" in the files section.  The background is:

The layout is HO, with Digitrax DCC.  This is a sinter mill scene.  A train from the junction will visit the sinter mill once daily, arriving by the lower track at right.  It brings empty ore cars from the steel mill, and occasionally other items, such as plant equipment, additives for the sinter, fuel for the fuel dealer, propane for the propane dealer, log empties for the pulpwood spur, etc. etc.  Generally, all or a portion of the arriving train proceeds straight to the harbour scene, via the track at upper right.  At the harbour, the train drops empties and picks up loads of limestone, coke, and sometimes ore.  Empty fuel tankcars are exchanged for loads at the oil terminal.  The train then returns to the Sinter mill, where things get interesting.

What I'm looking for, though, is just a wiring suggestion.  The section in green clearly needs to be a reversing section, and with three points of entry it can't be based on the position of a single turnout, so should be an automated reverser.  Some trains, however, will be long enough to bridge the short section of reversing track across the top.  I'm considering whether to just flip the whole darn branch to the harbour, as well as the rest of the trackage, as shown in red.  I can't see a down side to doing this.  There will only ever be one train operating on the branch, so only one consist.  However, all cars will have metal wheels, meaning there will be the potential for simultaneous reversal need at both ends of a reversing section.

Suggestions?

Blair Smith


New file uploaded to WiringForDCC

WiringForDCC@...
 

Hello,

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Re: Older Shinohara Turnouts

George Galyon
 

We have two old style (double crossbar) Shinohara Code 100 double crossovers in operation at our club which work well in both DC and DCC mode.  You have to throw both divergent routes simultaneously to avoid shorting at the K crossings (the upper and lower crossings in the crossing diamond) and the X crossings require both gunking up (I prefer JB weld..we have used printers ink but it wears quickly) to build up an insulation layer on the track sidewalls (not the top) of the X-crossings.  We also find that bulbs in series with the track feeds really help prevent shorting at the X-crossings if the "gunking" is too thin.  The newer Shinohara C100 doubles
(with the single crossbar) do not need gunking but you still have to throw both divergent routes simultaneously.

G. T. Galyon
Olde Newburgh Model RR Club


Re: Wire gauge remedy

Chris Killgore
 

OH! I didn't realize that you ran your railroad directly from the AC?.� Sorry, but your trying to compare apples and oranges.� Have you read about what actually the DCC signal is composed of!� It might help you understand it better.

Chris


On 11/27/2017 12:11 PM, DAVID KLEMM davidklemm7511@... [WiringForDCC] wrote:
�

Chris,

Don�t look behind every switch plate, outlet cover or light fixture where you live or work or shop! �

David Klemm
8 Plus
_____________________________
From: dvollrath@... [WiringForDCC]
Sent: Monday, November 27, 2017 13:00
Subject: Re: [WiringForDCC] Re: Wire gauge remedy
To:


�

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type�and/or otherwise misused.


DonV



---In WiringForDCC@..., wrote :

DO NOT USE WIRE NUTS!!!

Chris







Re: Wire gauge remedy

Chris Killgore
 

Wire nuts are for circuits using higher voltages and currents than DCC.  The higher voltages and currents tend to decrease corrosion between the wires that are twisted together.  Also, remember there is about a 7,000 to 8,000 HZ  signal on your buss and the twisted wires act like a miss-tuned antenna and can cause reflections on the buss.  Just what the bus needs is more garbage on it.  Why not do it right to begin with?

Chris, (retired communication tech)


On 11/27/2017 12:00 PM, dvollrath@... [WiringForDCC] wrote:
 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.


DonV



---In WiringForDCC@..., wrote :

DO NOT USE WIRE NUTS!!!

Chris





Re: Buss Wiring

Wil Davis <wdavis5069@...>
 

It's wired the way you suggest.  I basically followed the diagram
provided by Mark G. On the Wiring for DCC web site.
http://www.wiringfordcc.com/track_2.htm#a52 I used the simple bus method.

Wil


Re: Wire gauge remedy

rg <richg_1998@...>
 

Spell check again. Wire nuts.




On Monday, November 27, 2017, 7:53 PM, rg wrote:

As an slectrician, I have usrceire nuts for many years.

Rich




On Monday, November 27, 2017, 2:11 PM, DAVID KLEMM davidklemm7511@... [WiringForDCC] <WiringForDCC@...> wrote:



Chris,

Don’t look behind every switch plate, outlet cover or light fixture where you live or work or shop!  

David Klemm
8 Plus
_____________________________
From: dvollrath@... [WiringForDCC]
Sent: Monday, November 27, 2017 13:00
Subject: Re: [WiringForDCC] Re: Wire gauge remedy
To:


 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.


DonV



---In WiringForDCC@..., wrote :

DO NOT USE WIRE NUTS!!!

Chris








Re: Wire gauge remedy

Max Maginness
 

My best find was  with  the heavy duty  outlets for  screw and clamp attachment – the wires had been pushed in, but no screw down. Must have thought they were the “quickwire” type.

From: WiringForDCC@... [mailto:WiringForDCC@...]
Sent: Monday, November 27, 2017 11:12 AM
To: wiringfordcc@...
Subject: Re: [WiringForDCC] Re: Wire gauge remedy

 

 

Chris,

 

Don’t look behind every switch plate, outlet cover or light fixture where you live or work or shop!  

 

David Klemm

8 Plus

_____________________________
From: dvollrath@... [WiringForDCC] <wiringfordcc@...>
Sent: Monday, November 27, 2017 13:00
Subject: Re: [WiringForDCC] Re: Wire gauge remedy
To: <wiringfordcc@...>


 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.

 

DonV



---In WiringForDCC@..., <cochoochoo@...> wrote :

DO NOT USE WIRE NUTS!!!

Chris

 

 

 


Re: Wire gauge remedy

rg <richg_1998@...>
 

As an slectrician, I have usrceire nuts for many years.

Rich




On Monday, November 27, 2017, 2:11 PM, DAVID KLEMM davidklemm7511@... [WiringForDCC] wrote:



Chris,

Don’t look behind every switch plate, outlet cover or light fixture where you live or work or shop!  

David Klemm
8 Plus
_____________________________
From: dvollrath@... [WiringForDCC]
Sent: Monday, November 27, 2017 13:00
Subject: Re: [WiringForDCC] Re: Wire gauge remedy
To:


 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.


DonV



---In WiringForDCC@..., wrote :

DO NOT USE WIRE NUTS!!!

Chris








Re: Wire gauge remedy

Tim Johnson
 

Why not use wire nuts?

On my layout very drop from a rail is connected to a soldered wire from the bus with a wire nut. I've never had a problem, and it is very convenient if you need to isolate that rail section (assuming the rails are not electrically joined).
-- 
Tim
Timothy A Johnson, Tucson, AZ (www.sbb-bls-bahnen.com)
European Train Enthusiasts, Central Arizona Chapter (www.ete.org)

---In WiringForDCC@..., <cochoochoo@...> wrote :

DO NOT USE WIRE NUTS!!!

Chris



 


Re: Wire gauge remedy

David Klemm
 

Chris,

Don’t look behind every switch plate, outlet cover or light fixture where you live or work or shop!  

David Klemm
8 Plus
_____________________________
From: dvollrath@... [WiringForDCC]
Sent: Monday, November 27, 2017 13:00
Subject: Re: [WiringForDCC] Re: Wire gauge remedy
To:

 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.


DonV



---In WiringForDCC@..., wrote :

DO NOT USE WIRE NUTS!!!

Chris






Re: Wire gauge remedy

dvollrath@...
 

Chris,

What's your sad story about wire nuts?

Every electrical wire connecting means can be a disaster if not properly selected to match the wire size & type and/or otherwise misused.


DonV



---In WiringForDCC@..., <cochoochoo@...> wrote :

DO NOT USE WIRE NUTS!!!

Chris




Re: Wire gauge remedy

Chris Killgore
 

DO NOT USE WIRE NUTS!!!

Chris


On 11/27/2017 9:47 AM, dvollrath@... [WiringForDCC] wrote:
 


Crimped barrel splices, especially insulated ones, are also subject to where the wire is pushed too far into the barrel and the insulation is actually being crimped in the conductor space instead of only the metal part of the wire.

DonV  

---In WiringForDCC@..., wrote :

All good points, Don, I'll keep that list in mind as we dig deeper.  Many of the joints are crimp butt-splice connectors, good in theory but prone to weak-hand syndrome.

Thanks

Blair


On 2017-11-27 09:37, dvollrath@... [WiringForDCC] wrote:

Blair,

The size of the wire might not be the real problem. #18 can easily carry enough current to pass the coin test. Look at all the power wiring splices. Many non-electrician types tend to simply twist the wires together and thereby making a poor electrical connection which can get worse over time. Verify that the joints are either soldered or are correctly using wire nuts. Also verify the soldering of feeder wire connections to the rails... especially at those sections that don't pass the coin test. Do not rely on track feeder wires connected to rail joiners as the joiners to rail connections are the problem. If that is the case, be sure to solder the joiner to the rail.


DonV  



---In WiringForDCC@..., wrote :

Hi

Debugging another friend's layout.  His bus wiring is not up to snuff,
as the coin test fails in many sectors.  It's clear to me that his bus
wires, 16 and 18 ga speaker wire with numerous butt-splice connections,
is the root of the problem; it's an old DC layout, with the blocks
rewired.  Runs are in the 25' range, so I'm not worried about distance. 
He's reluctant to completely rewire, as he did put feeders in for every
section of rail.

I think he could improve performance by running a parallel larger gauge
buss pair, interconnecting the Rail A to Rail A' wires, and the Rail B
to Rail B' wires, at regular intervals (say 5').  Think of each buss as
beginning to look like a ladder, with the rungs being the interconnects
and the feeders running from one side of the ladder to the rails;
really, this is an extension of the rails-parallel-to-the-bus wires
anyway, now we just have three parallel paths.

Does anyone see a serious gotcha with this?  I don't see one, as long as
the A and A' wires, and the B and B' wires, stay in reasonable
proximity.  It's not ideal, but it is a lot less work than a complete
rewiring, especially as some of his feeders are darn near inaccessible.

Thanks for any suggestions

Blair



Re: Wire gauge remedy

dvollrath@...
 


Crimped barrel splices, especially insulated ones, are also subject to where the wire is pushed too far into the barrel and the insulation is actually being crimped in the conductor space instead of only the metal part of the wire.

DonV  

---In WiringForDCC@..., <smithbr@...> wrote :

All good points, Don, I'll keep that list in mind as we dig deeper.  Many of the joints are crimp butt-splice connectors, good in theory but prone to weak-hand syndrome.

Thanks

Blair


On 2017-11-27 09:37, dvollrath@... [WiringForDCC] wrote:

Blair,

The size of the wire might not be the real problem. #18 can easily carry enough current to pass the coin test. Look at all the power wiring splices. Many non-electrician types tend to simply twist the wires together and thereby making a poor electrical connection which can get worse over time. Verify that the joints are either soldered or are correctly using wire nuts. Also verify the soldering of feeder wire connections to the rails... especially at those sections that don't pass the coin test. Do not rely on track feeder wires connected to rail joiners as the joiners to rail connections are the problem. If that is the case, be sure to solder the joiner to the rail.


DonV  



---In WiringForDCC@..., <smithbr@...> wrote :

Hi

Debugging another friend's layout.  His bus wiring is not up to snuff,
as the coin test fails in many sectors.  It's clear to me that his bus
wires, 16 and 18 ga speaker wire with numerous butt-splice connections,
is the root of the problem; it's an old DC layout, with the blocks
rewired.  Runs are in the 25' range, so I'm not worried about distance. 
He's reluctant to completely rewire, as he did put feeders in for every
section of rail.

I think he could improve performance by running a parallel larger gauge
buss pair, interconnecting the Rail A to Rail A' wires, and the Rail B
to Rail B' wires, at regular intervals (say 5').  Think of each buss as
beginning to look like a ladder, with the rungs being the interconnects
and the feeders running from one side of the ladder to the rails;
really, this is an extension of the rails-parallel-to-the-bus wires
anyway, now we just have three parallel paths.

Does anyone see a serious gotcha with this?  I don't see one, as long as
the A and A' wires, and the B and B' wires, stay in reasonable
proximity.  It's not ideal, but it is a lot less work than a complete
rewiring, especially as some of his feeders are darn near inaccessible.

Thanks for any suggestions

Blair