Wire & Cable 25 Condutor or Similar with Sheild & Drain
Global recommends using 18 guage, Stranded, Shielded with a drain wire as shown below for power and data. The example below shows a 4 conductor which can be used to carry both 18VDC power to devices as well as data to each device.
Consult your local regulations for insulation material type as well as if plenum or non-plenum is necessary.
A - Drain Wire. Must be connected ONLY to the remote ends ground stud
B - Sheild
C - Outer jacket insulation.
**Note the picture does not represent 25 conductor cable but is shown to display the outer insulation, sheild and bare drain wire. Attache drain at MUX END Ground Lug ONLY.
For data wire, we recommend only wire that conforms to RS485 specifications. At minimum, it must meet or exceed the RS485 spec, be twisted pair, stranded, shielded, with a drain wire. Although most any size wire may be used for data, it is recommened to use the largest guage possible (and reasonable) for your application. This will aid in reducing wire breakage over time. Also consider the use of “direct burial” wire when placing in old conduit.
Part numbers are from Windy City Wire 1.800.379.1191
Also recommended is Belden 9841, Alpha 6412. These are 2 conductor, 24 Awg 300V 120 Ohm single, twisted pair wire – again for data wire only.
No matter which brand, data wire must meet or exceed the EIA 485 specifications. Use of other type or brands of wire may result in unsatisfactory results.
**Note the picture does not represent 25 conductor cable but is shown to display the outer insulation, sheild and bare drain wire. Attache drain at MUX END Ground Lug ONLY.