I have a fairly ambitious layout a-building, and it's time I considered DCC
toggle quoted messageShow quoted text
power distribution. I have posted a PDF to the files section of this group,
named "ACR 20040402b DCC.pdf", to give you an idea of dimensions,
constraints, etc. What I'm looking for is creative ideas for power
distribution within the room, presuming a single level layout. I'm trying
to keep busses to a max of 30' from a DCS100, but that rule isn't firm. I
believe the room could be served by two DCS100 (5A), located at A and B, in
terms of my expected traffic loading - up to 15 HO diesels running at any
one time, with another 30 in staging tracks). Each DCS100 will feed at
least one PM42. However, I'm concerned about total feed length around the
LHS. I may be better served with three DCS100, one each at A, D, and E.
(the link shown from A to B represents the availability of a below-floor
duct, but to extend power buss across this is silly - total length consumed
is about 12', to what end?)
I'm sure I haven't given enough info, but please just ask away.
From: Ulrich Albrecht [mailto:albreuf@...]
Sent: March 31, 2005 12:49
Subject: Re: [WiringForDCC] Digest Number 8
I did not want to scare anyone off DCC, but would actually encourage
everyone to take this route. I would only recommend that everything is
working fine under DC so that the conversion experience does not become a
pain. All too often, one blames DCC for problems that are actually old
My main concern is that the wiring needs to be able to ahndle the loads.
Yes locos use the same current under DCC as under DC, but on a DC layout
running six engines this load is distributed between 3-4 power packs,
while under DCC all may go through one wire at a certain point. This may
result in poor performance due to voltage drop or overheating of the wire.
On 31 Mar 2005 WiringForDCC@... wrote:
There is 1 message in this issue.
Topics in this digest:
1. Rewiring an existing layout for DCC
From: "Marcus Ammann" <mammann@...>
Date: Thu, 31 Mar 2005 00:02:05 -0000
From: "Marcus Ammann" <mammann@...>
Subject: Rewiring an existing layout for DCC
I agree with what Dale has said and all that Allan with his Wiring
for DCC site suggests, Ulrich has stated what I have termed, "too
many negatives to go to DCC" and has scared off many a potential
A lot of home layouts will not need 2, 3 etc boosters and will never
reach the full potential of one booster's designed current limit.
They will only run one to say 4 or 5 locos, and that would be with a
I would encourage any modeller contemplating going to DCC to reap the
rewards that are available in DCC, to JUST connect a DCC system to
his layout, with one proviso, use a 12 volt "1156" or similar lamp in
series with one track feeder, but the booster will never cut out with
a short, the lamp illuminates and gives a "very" visual warning. This
will protect the layouts wiring and limit the total number of locos
on the track running at one time, but at least a single opertor will
be happily operating with DCC and enjoying all the new found features
that DCC brings with the minimum effort and all done in a few hours
and that includes fitting a decoder.
A DCC equipped loco does not draw anymore current than its dc
equivalent, maybe a few milliamps more to power the electronics but
I have over 100 Peco turnouts in code 100 and have not converted any
of them to "DCC Friendly". I would only convert installed turnouts if
they are causing a problem, and only after I have done things like
improve track alignment and correct any wheel sets that are out of
gauge, this will correct most problems. I have progressively changed
my layout as the need arises and have used all the information that
Allan and others have provided on his web site, to answer my own
questions and help me understand the "wiring problems".
With my recommendation, you will address a problem when it presents
itself, otherwise don't worry yourself about some things that never
happen, but at least you are running in DCC and not thinking about
how to modify all your turnouts and rewiring your layout and never
getting to DCC. At a later stage you will probably rewire sections or
the whole of you layout.
If starting from scatch, then yes, wire system as it suggested in
these pages, modify turnouts prior to fitting and wire in power zones.
There is NO substitute for good wiring practices.
--- In WiringForDCC@..., Ulrich Albrecht <albreuf@m...>
One of the statements I often heard about conversion from DC to DCC
that if everything works under DC, just hook up a DCC booster, andthings
will work. In my opinion, this has to be taken with a grain ofsalt, and
here are my reasons:like
a) DC uses much lower current loads than DCC. I you use a booster
Digitrax DB150 or DCS100, the maximum output is 5A, while a goodpower
pack in DC may deliver 2A. You may end up overloading your DCwiring with
a DCC-booster. I rewired my lauout completely.particular
b) DC is much less sensitive to shorts than DCC. This applies
to turnouts. A metal whell that short circuits a turnout may not bebut it
noticed by the DC powerpack due to the short duration of the short,
will trigger the booster.bus
My sugestion, rewire the whole thing unless you have a AVG#18 power
(actually I would use AVG# 14 or lower when rewiring). The #18 iso.k.
unless your loads will exceed 3A, in this case it will cause avoltage
drop. Also make sure that all your wheels are in gauge, so thatthey do
not touch parts of switches which are connected to opposite outputsof the
booster. As far as Peco turnouts are concerned, I have noexperience, but
if you do not have a short under DC, your set-up should work exceptfor
--- In WiringForDCC@..., sawlumber@a... wrote:
I have an existing layout. I'm getting ready to change over
DCC. I have
Electrofrog Peco turnouts. I have heard that if you putinsulators on the
frog rails and the stock rails of the switch, I won't have totear them out
and re-wire them? Any ideas?
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