Wiring for Digital Command Control (DCC)
Summary: Wiring for DCC is not as complicated as some would have you believe, but it is a very important component to the entire Digital Command Control Experience. Good wiring is essential for reliable operation with Digital Command Control. Due to the large number of related topics to wiring, this article is meant as a jumping off point to other articles. Brief summaries of each topic, with a link to the primary article for more detailed information. Whether you are starting your first layout or converting an existing layout, this is a good place to start.
Wiring Your Railroad for DCC
All the manufacturers make the same claim: Just two wires to the track and you are ready to go! Reading the manual, it says something much different. It talks of buses, feeders, and the distance between feeders. The need for a power bus made of heavy gauge wires. Did they not tell you that wiring for Digital Command Control was much simpler? Going to your favourite online Model Railroading Forums you ask if all this wiring recommended by the manuals is necessary.
You will get many answers, some will be conflicting or provide erroneous information. Some will say yes, you need all that wiring. Inevitably someone will say the opposite, claiming they run their entire layout with a pair of wires from the booster to the track and nothing else. Maybe someone referred you here to the DCCWiki.
Which answer is right and which is wrong?
Yes, you can use two wires to connect the command station/booster to the track. Should you? No.
Wiring is extremely important for reliable DCC operation and signal integrity. Digital Command Control is not Analog DC, and the wiring practices for analog operations do not apply here. You just can't crack open the throttle a little more when the train slows down, because DCC allows you to operate your trains, instead of your focus being on controlling the track voltage.
The following pages explain DCC wiring concepts, methods and best practices. So, you control your trains, not the track.
General Wiring Topics
- Wiring Tools – First things first. You'll need some basic tools. Some simple electrical tools can be made for a few dollars that can save you hours of time and less frustration while wiring your layout. Keep in mind that you do not buy tools, you invest in them.
- Wiring Complexity – Wiring for your layout can be as simple or as complex as needed or desired.
- Wiring Color Code – It's best to develop a colour code when you're just getting started. However, it's important to stick to it! This article explains picking a wire colour code as well as wire sourcing to help you stick to your code.
- Wire Sizes and Spacing – Are these wire sizes overkill? How far apart should the track feeders be? Answers to these, and more.
- Wire Types – Selecting the correct type of wire is important for the reliability of the DCC signal on the track.
- Voltage Drop – Model railroads have low tolerance for voltage drops throughout the layout. Be sure to use the proper wire gauge and feeder spacing.
- Do I Need to Twist the Bus Wires? The question everyone asks.
- Wiring Tips and Tricks
- Soldering Yes, there is soldering!