Re: Sub Bus "beyond" Main Bus
Anthony Ashley <anthonyashley@...>
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Your layout sounds very similar to mine. Mine is called Welsh Dragon rail is 35feet by 15 feet and is in N gauge. I spent 12 months planning and have built the boards for approx 1/6 of the layout. It has taken me 4 months of emails and research to sort out the electronics, which I think i have now cracked.
I have a thread at the following which you may be interested to look at as I have been asking many questions similar to your own over the last 4 months.
The thread is at :
You will find my wiring diagrams toward the end of the thread. I have slightly modified them and can send them to you in a more readable format if you wish to see them.
From my research the sub bus and bus should be no longer that 30 feet in length. In addition I have read that there is a need to twist the pairs of wires 3 times every metre. It cann’t hurt to do this and is supposed to assist with impedance. You should also terminate the wires using a resistor between the wire pair to terminate them.
You may find the following web site very useful as I have used it extensively:
I contains much info on wiring and electronics.
On my layout I am having approx 7 power districts and 35 sub districts. Each sub district will have an on/off switch to isolate the sub district to assist with fault finding on the large layout. In addition every track will be wired into a terminal block so that I can disconnect any track to isolate faults.
If you wish to talk further please send an email and I can assist further if required.
From: WiringForDCC@... [mailto:WiringForDCC@...] On Behalf Of cdrat72kingscc@...
Sent: Thursday, 16 January 2014 7:36 AM
Subject: [WiringForDCC] Sub Bus "beyond" Main Bus
I have a 3 tiered layout that is nearing the build phase after 2 years planning! I have approx. 700" of track to lay down and after reading through Wiring for DCC's web site I have designed my layout to use the Bus/Sub-Bus wiring scheme. The layout room measures approx. 16' x 21' and I am hoping to go with 2 Boosters for the layout. At least that is my current thinking as I will be running short trains - trams, subways and suburban trains with 2, maybe 3 passenger trains (7-9 cars w/ 1 Lok). All in all I plan no more than 6-8 in operation at one time.