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On the right is an old turnout, replete with green LEDs  which show the path through the frog as the relay changes with the switch blades. The next step should be that the LED stops flashing and the servo begins to search for the left extremity of the throw - but nothing happened . The servos are nice and quiet - which is what I need for making movies; but the relays do click a little bit. They need the load on the motor for programming, so a 100 Ohm resistor is put across the orange and grey motor wires. Is the "load" created by a resistor Max - those are the only electronic things I remember as being calculated in ohms or have I missed something ? A lot of programming devices will have difficulty detecting decoders unless there is a minimum level of resistance in the circuitry. So, it's necessary to put a small resistance across one side of the relay contacts so the programmer knows the equipment is there. Direct connection to the power mains will result in a spectacular fire works display and cause damage that will most likely NOT be covered under the manufacturer's warranty.
Yes Joe did not specifically include power supplies in his diagrams, but he did include power supply information in the Comments section of the Universal DCC Boosters table and the following note under Table 1.
Joe, what advantages or disadvantages to gaping every section of track that has its' own set of feeders? Easier to predict current draw in a single location, making breakers, power distribution, etc easier to judge. Biggest disad is that if a feeder fails (bad solder, gets snagged moving boxes around under the layout, gets chewed on by the cat, etc) then that section of track goes dead. I experimented with polyswitches while developing the power management system for my railroad. My original article had another 5 pages of tangent on DCC friendly turnouts that I cut out because it really wasn't about track bus wiring. I've got some scribbles on it and will see if I have enough coherent thoughts to make it worthy of your fine pub. I've found that a Polyswitch is somewhat like a regular fuse and I use them not to protect the trackage loads, but to protect the boosters and command station from the healthy 20 amp output of the PS2012. Using an 1156 bulb to protect the power block from an operator caused short at the frog is an novel concept. Building 31 handlaid turnouts, all with powered frogs, and this might just be the answer I've been looking for. Thanks for the informative article Joe which did a good job bringing disparate information together, good diagrams too.
Also using the popular #14 gauge, if memory serves me after reading your article (and it may not), you stated a maximum of 35 feet at 5 amps. Now I think I'm with Joe-Daddy, you need to put your head down prepare an additional 27 pages (forget this G scale, live steam thought bubble, its just distracting you) on the DCC friendly turnouts and accessory bus ++??
The only problem with the Tam Valley booster is its power rating at 3 amps, but even that isn't that much of a big deal. There is no one right answer, or rather the right answer is very complex to calculate, hence why recommendations are all over the board. Wiring choices are made during construction so it is often impractical for actual measurements to be made.

The person claiming 22AWG should be limited to 6" at 5A probably came to the conclusion based on an arbitrary limit of allowable voltage drop. Many (but not all) of the boosters allow you to set the voltage using a jumper or dip switch. By the way, if you don't have a RR Meter (get from your DCC dealer), it can be difficult to test your track voltage because a regular Volt-Ohm meter (VOM) won't work since the DCC signal is a specialized square wave. Actually you can make a simple circuit (equivalent to what is in a decoder) to make this measurement without opening up a locomotive and risking damage to a decoder.
The CL2 and LED provide a minimum DCC load and provide an indication that some power is applied to the circuit. I added Joe's Amperage calculations to the electrical tab of my evolving model railroad spreadsheet.
Somewhere I have calculators for determining layout size (including Armstrong Squares), and various other measurements. You need to take the ENTIRE system into account, including maximum draw on the main power supply, when planning the layout.
Contrary to Joe's drawings, most boosters do NOT connect directly to 110 VAC (or 220 VAC) power mains. Could not find a suitable component that was faster than my power supply's internal shutdown circuitry.
The spread between hold and trip (relative to time-to-trip) was the obstacle I could not overcome and why I ended up utilizing an LTC1153 based solution. Of course they are talking about the 4-5a transformers that many people use as a power source. From a cost perspective, despite starting DCC using an NCE power cab, I see a clear case for the Tam Valley booster option. Erring on the side of caution by using larger gauge wire is a practical means of minimizing voltage drop in the absence of empirical data for the particular situation.
However, the higher you set the voltage, the lower the current output will be, so you should prefer a lower voltage level setting. Connect the test leads of a normal VOM meter to the white and blue decoder leads, then turn on F0 (headlight function) and read the voltage - that's your DCC track voltage!
It does not optimize conductor sizes for several different loads at various points in a circuit. The actual voltage drop can vary depend on the condition of the wire, the conduit being used, the temperature, the connector, the frequency etc. There are measurement errors related to this and similar circuits, but measurements made with this circuit will be consistent. The value of R1 can range from 0 Ohms to about 10 Ohms depending upon the size of capacitor C1.
For a more accurate DCC voltage measurement, the rectifier voltage drop needs to be added to the meter reading. This load should be limited to less than the specified continuous current for the rectifier.
Isn't one of the purposes of the circuit breaker to reduce the booster amps to a safe level such as 3 or 4 amps ?
Something like the above case could be fixed by splitting the power districts into two separate groups of four, each group on it's own booster.

Neither the service provider nor the domain owner maintain any relationship with the advertisers. Your success lends me to believe the PS2012 must have a slower internal limit than my off-the-shelf switching supply. Joe, since you sound knowlegeable about the accessory bus, would you be interested in writing an article about it? Multiple feeders, each carrying a percentage of the load, reduces the overall voltage drop.
The calculations used to determine the recommended conductor sizes for branch circuits are based on 60°C ampacity ratings for circuits rated 100 amps or less or marked for use with #14 AWG - #1 AWG. To calculate that would mean to put the engine at a point on the track and calculate the resistance for all feeders to determine the amperage thru each feeder. One error to note is the voltage measured will be reduced from the actual voltage by the voltage drop across the bridge which depending upon the type of diodes used in the bridge could exceed several volts. I typically use a 1 Ohm resistor with the 47 uF capacitor which will limit the surge from a 15 V supply to less than 15 Amps (about half of the surge limit of the rectifiers I use).
The 583-RC201 is specified for 2 Amps, so for a 15 Volt supply the R2 resistance should be greater than 7.5 Ohms.
I also added the wire size tables from the article, as well as the above table supplied by rsn48. Likely you have somewhere in the neighborhood of 200A available at the meter yet no one circuit in your house will ever pass 200A because of the breakers in your load center. If your power supply is 8 amps, you could still find it overloaded if you had 5 districts occupied with a lode of only 2 amps in each.
In case of trademark issues please contact the domain owner directly (contact information can be found in whois). If I'd expanded the scope even more, then we would have had a 40 page article instead of 27 pages. I am often amazed that some guys write that a #22 gauge wire should only run 6 inches at 5 amps. Most of the others do it the other way (a merchandising ploy I first encountered in the 50s). Circuits rated over 100 amps or marked for conductors larger than #1 AWG are determined using 75°C ampacity ratings. Consult with an engineer if your application requires more complex engineering calculations. I like to use a 150 Ohm 2 Watt resistor to simulate a minimum load of about 100 milliamps (it can still get fairly hot). Calculations to determine service and feeder conductor sizes are based on overcurrent device ratings rather than actual expected loads which are conservative and may yield oversized conductors.

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