> > A discussion on the SMODule list was regarding what gage wire is
needed for carrying a DCC signal on modules. #10 has been suggested.
Gents...I think that BOTH amps and volts need to be considered. Try
this for some rules of thumbs:
1. Voltage drop should not be more than one-half volt over the longest
run of wire. A "run" of wire is out and back in total. Thus, if the
wires go out 60 feet to the track, the "run" is actually 120 feet.
Various charts can provide voltage drop information. Voltage drop
greater than one-half volt could lead to the possibility of strange
loco behavior. Not ideal. Why take the risk?
2. Figure the maximum current that will pass through a wire. Perhaps
an A-B-B-A with ten lighted passenger cars (bulbs, not LEDs) would be a
reasonable maximum. Then choose a wire gauge that will carry twice
that current. Various charts will provide the current carrying
capacity for different gauges of wire. Check carefully to determine if
the chart is based on bare copper wire in air. Or, if said chart is
based on copper wire enclosed by insulation -- which inhibits air
cooling. Different current ratings for different circumstances.
3. Choose the larger size wire from 1 or 2 above. You are certain to
be safe. No doubt about it. Yes, a smaller wire will probably work
OK, but why take the risk? One size (or two) larger wire is not that
much more expensive.
4. With a little bit of legwork, it should not be too hard to locate a
buddy who knows an electrician. These guys usually have a stash of
leftover materials from various construction jobs. Surplus wire is
generally plentiful and cheap -- even free if you provide the pizza and
beer. Also, check local wire distributors for old obsolete stuff that
is typically stored in the back room. Again, the price is darn near
free since they would just as soon get rid of it. So maybe the gauge
of the wire will really depend on what you can find for free. Free
wire can carry the electrons just as well as the costly stuff. MIL
SPEC wire is not needed. Some folks have used lamp cord.
Having fun.....Ed L.
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