Re: Wiring a Helix for DCC
Vollrath, Don <don.vollrath@...>
Brian, An ideal connection is to have a track bus feeder about every 6 ft. What I might recommend is …
Run a sub-bus up/down along one of the uprights. 14-16 AWG
Add track feeders to the sub bus at each circular pass of the spiral.
Solder the track joints in the spiral for alignment and continuity.
Leave plenty of space gaps in the rails at top and bottom for expansion/contraction.
This should be adequate.
But with an approx. 33 inch outside radius, the rail length on each turn will be ~17 ft long…. Or about 8+ feet from the nearest outside upright and track feeder. There is no need to follow the track along the spiral with an electrical wire, but if you are overly concerned, providing a second sub-bus and connecting to each set of rails at each pass on an opposite upright will double the electrical connections and reduce the electrical path to the nearest feeder to be less than 5 ft. A little on the side of overkill.
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Brian Eiland
Sent: Thursday, June 07, 2018 1:10 PM
Subject: [w4dccqa] Wiring a Helix for DCC
I've seen a few references that suggest it is NOT necessary to run the bus-lines along the track route in a spiral helix, but rather just run the track feeders lines down one of the vertical legs (post) to the bus wires at the bottom. I
thought this was a good idea.