Loop Pattern - Rain Bird ESP-LXIVM Series Installation, Programming & Operation Manual

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.
ESP-LXIVM Controller
2-Wire
Loop
13 ESP-LXIVM Series Controllers
Valve Boxes
2-Wire splice at
branch takeoff s
allow easy breaking
of a loop for
troubleshooting
2-Wire Loop Pattern design showing IVM Devices and Valves
Maximum Critical Path Lengths for 2-Wire Paths
Nominal Ohms per 1000'
Wire Size or Ohms per Km
(per conductor)
2.5 mm 7.5 Ohms/Km
14 AWG 2.58 Ohms/1000'
12 AWG 1.62 Ohms/1000'
10 AWG 1.02 Ohms/1000'
Star Loop
Km Miles Km Miles
3.00 1.86 12.00 7.46
2.66 1.65 10.63 6.61
4.23 2.63 16.93 10.52
6.72 4.18 26.89 16.71
Critical Path
Total cable length of
the loop's critical path
(maximum 6.61 miles
(10.63 km) using
14 AWG cable)
IVM Devices