ESP-LXIVM Controller
ESP-LXIVM Series Controllers
13
Loop Pattern
A Loop Pattern supports the greatest distance from controller to IVM
Devices.
The Loop Pattern requires that the 2-Wire path loop back and return
to the controller. The critical path for a Loop design is determined by
calculating the distance around the loop to the farthest IVM Device
and back to the controller. For both the Star and Loop designs, dif-
ferent distances can be supported with larger gauge cable.
Maximum Critical Path Lengths for 2-Wire Paths
Nominal
Wire Size
Ohms per 1000’
or Ohms per Km
(per conductor)
Star
Loop
Km
Miles
Km
Miles
2.5 mm
7.5 Ohms/Km
3.00
1.86
12.00
7.46
14 AWG
2.58 Ohms/1000’
2.66
1.65
10.63
6.61
12 AWG
1.62 Ohms/1000’
4.23
2.63
16.93
10.52
10 AWG
1.02 Ohms/1000’
6.72
4.18
26.89
16.71
Valve Boxes
2-Wire splice at
branch takeoff s
allow easy breaking
of a loop for
troubleshooting
IVM Devices
Critical Path
Total cable length of
the loop’s critical path
(maximum 6.61 miles
(10.63 km) using
14 AWG cable)
Branch #2 L
oop
Main T
runk
Loop
2-Wire
Loop
Branch #1 L
oop
2-Wire Loop Pattern design showing IVM Devices and Valves
