Installation Instructions

Installation and Commissioning Guide - R2.0
1-12 © 2001 Triton Network Systems, Inc. All Rights Reserved.
R
o
is the resistance of the outdoor cable (see Table 1-4)
w is the number of pairs of wires in the indoor cable
t
Cu
is the temperature coefficient of copper and is equal to 1.0039
30
In most cases, a 10, 12, or 14 gauge wire will be used in the indoor cable. Table 1-3 gives R ·
values for these three wire sizes.
Triton Network Systems provides outdoor power cables in lengths of 20 meters (65.6 feet), 40
meters (131.2 feet), and 100 meters (328.1 feet); each of these cables uses two pairs of 12-AWG
wire. The resistance for each of these cables (R
o
) are given in Table 1-4.
If the length of the outdoor cable is specific to the installation (i.e., the outdoor cable is not a
Triton Network Systems-standard cable), use the following formula to calculate R
o
.
where:
d
o
is the distance of the outdoor cable run (in feet)
If a single cable is used to connect the power supply and IFU, the formula for the maximum
cable run (d) is as follows:
Example:
If the outdoor cable is 40 meters and the indoor cable is 10 AWG, using a single pair of wires, the
maximum allowable indoor cable run (d
i
) is calculated as follows:
Table 1-3: Resistance Per Foot
10 AWG 12 AWG 14 AWG
R · .001 Ω/ft. .00202 Ω/ft. .00252 Ω/ft.
Table 1-4: Resistance of Outdoor Cables
20 m 40 m 100 m
R
o
.07 Ω .15 Ω .37 Ω
R
o
2 R′ d
o
t
Cu
w
---------


×××


=
d
2.6
2 R′×
--------------


w
t
Cu
---------


×






=