Old cable generally makes a decent pull string :) ...assuming they're not fastened in some inaccessible location.
I'm surprised at the current ratings for that 15ga wire, given how long the run could be, although I suspect most N2K busses carry much less than the maximum; otherwise the voltage drop would be significant. -- Shawn Wright shawngwri...@gmail.com S/V Callisto, 1974 C&C 35 https://www.facebook.com/SVCallisto On Mon, Apr 27, 2020 at 1:47 PM Bill Coleman via CnC-List < cnc-list@cnc-list.com> wrote: > To Josh’s comment, I didn’t think of the backbone being more robust, that > makes perfect sense. And it turns out it is, according to Maretrons data. > > I got this off Maretron site for cable, > > > > 2x15 (1.45mm) AWG > > 3.44 Ohms/1000 ft max > > 16 Amps – NB1 > > 14 Amps – NG1 > > Red/Black > > 2x18 (1.02mm) AWG > > 120 Ohms ± 10% > > 12 pF/1000 ft Max > > White/Blue > > > > So it looks like the power cable is 15 Gauge and the data is lighter at 18 > Gauge. So I guess I better make sure I have at least 15 Gauge wire or else > try and get another wire through some difficult spaces. > > > > And Jim, I may have miss-spoke, when I said the wire was twisted, I should > have said they (Power, red and black) were twisted strands inside the > insulation, they are actually not twisted around each other. > > > > > > Thanks all for all the input. > > > > Bill Coleman > > Erie PA > > > > -----Original Message----- > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of James > Nichols via CnC-List > Sent: Monday, April 27, 2020 12:42 AM > To: cnc-list@cnc-list.com > Cc: jfn...@yahoo.com > Subject: Stus-List NMEA 0183 vs. 2000 Wiring Compatibility > > > > Bill, > > > > As others have said, the 0183 wire is likely to support the signal cables > > but not to not support the power requirements of downstream devices, > however > > there are work arounds. > > > > Often when you are replacing 0183 devices with newer N2K devices, the older > > devices already had power run to them. Using a short N2K pigtail cable, > you > > can splice the signal cable to your existing 0183 network cabling and the > > power cables to your existing power. Or use a power injector close to the > > new device. > > > > The idea of NMEA 2000 (N2K) was that a single cable would run through the > > boat and there would be short connections (drops) to the main cable to > > connect the various devices. Think of it as a set of icicle Christmas > > lights. The main cable carries the power and the short drops connect that > > power to the lights themselves. > > > > NMEA 0183 was typically wired in one of two methods, home runs or daisy > > chains. Depends on the installer. > > > > Home runs are where all the devices were wired back to one central location > > and would require that you to use something like Maretron's multiport box > to > > interconnect your devices. This makes for some long wire runs to various > > devices and could possibly cause intercommunication issues between devices > > that are separated by the most amount of wire. Shouldn't, but could. > > > > If your boat was wired in a daisy chain, you would just need to replace the > > connectors where the cabling went into and out of the old device and add a > > T-connector to provide your drop to your device. This wiring method would > > more closely represent the main backbone system used by N2K, except your > > backbone runs everywhere in the boat instead of just down the middle. > > > > While trying to reuse the existing wiring may save you some expense in the > > wire costs, typically there is an easy wiring route for a new main run > > through the bilges or behind the settees. Then you just have to run the > > short drops through somewhat more difficult areas. About the most > difficult > > one I can think of would be getting up the walls and through the ceiling to > > the place that the wires enter the mast. All the remaining runs should be > > fairly easy. > > > > My personal opinion is that while doing things to make the existing wire > > work can be done, it isn't worth the headache and expense that you would > > encounter down the road when a connection that wasn't done perfectly causes > > problems for the whole system. Also, manufactures don't tend to warranty > > things that are not done to spec. So if you are purchasing new equipment, > > best to go with the correct wiring also. > > > > James > > SV Kristy > > > > > > > > Message: 2 > > Date: Sun, 26 Apr 2020 17:56:32 -0400 > > From: "Bill Coleman" <colt...@gmail.com> > > To: <cnc-list@cnc-list.com> > > Subject: Stus-List NMEA 0183 vs. 2000 Wiring Compatibility > > Message-ID: <1c3401d61c15$8cad8000$a6088000$@com> > > Content-Type: text/plain; charset="UTF-8" > > > > I am replacing some 0183 wiring for NMEA 2000, and I bought some 2000 end > > connectors (Maretron FA-NF-ST Mini Field Attachable Connector (Female) > > FA-NM-ST) that you can screw the terminals into. Some of this 0183 wiring > > was probably installed before the boat was completed, and It looks very > > difficult to re-wire. Does anyone know if I can just use the 0183 wiring to > > now become 2000 compatible? In other words, is there anything lacking in > > the older wiring, like shielding, twisting, etc, that would make this not > > work? > > > > Bill Coleman > > Erie PA > > > > > > > > > > > > _______________________________________________ > > > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
