PEAK® OEM 18 240 Volt SMART Equipment Controller Installation Instructions
18
Cable and Wire Length Guidelines
Table 4 defines cable length guidelines for the various wire sizes that may be used for wiring low-voltage (<30 V)
input and output wiring.
Maximum Cable Length versus Load Current
Use Figure 12 to estimate the maximum cable length relative to the wire size and the load current (in mA) when
wiring inputs and outputs.
Note:
Figure 12 applies to low-voltage (<30 V) inputs and outputs only. The required wire size and length for high-
voltage (>30 V) Relay Outputs is determined by the load connected to the relay and local electrical codes.
Figure 12: Maximum Wire Length for Low-Voltage (<30 V) Inputs and Outputs by Current and Wire Size
Table 4: Cable Length Guidelines for Recommended Wire Sizes for Low-Voltage (<30 V) Inputs and
Outputs
Guidelines
Wire Size/Gauge and
Type
Maximum Cable
Length and Type
Assumptions
A
1.5 mm
2
(18 AWG)
stranded copper
457 m (1,500 ft) twisted
wire
100 mV maximum voltage drop
Depending on cable and the connected input or output
device, you may have to define an offset in the setup
software for the input or output point.
0.8 mm (20 AWG)
stranded copper
297 m (975 ft) twisted
wire
0.6 mm (22 AWG)
stranded copper
183 m (600 ft) twisted
wire
N/A (24 AWG)
stranded copper
107 m (350 ft) twisted
wire
B
1.5 mm
2
(18 AWG)
stranded copper
229 m (750 ft) twisted
wire
100 mV maximum voltage drop
Depending on cable and the connected input or output
device, you may have to define an offset in the setup
software for the input or output point.
0.8 mm (20 AWG)
stranded copper
137 m (450 ft) twisted
wire
0.6 mm (22 AWG)
stranded copper
91 m (300 ft) twisted
wire
N/A (24 AWG)
stranded copper
61 m (200 ft) twisted
wire
C
See Figure 12 to
select wire size/
gauge. Use stranded
copper wire.
See Figure 12 to
determine cable length.
Use twisted wire cable.
N/A
450
500
400
350
300
250
200
150
100
50
0
0 m 0 ft
(
)
15.2 m 50 ft
(
)
30.5 m 100 ft
(
)
45.7 m (150 ft)
61 m 200 ft
(
)
76.2 m 250 ft
(
)
91.4 m 300 ft
(
)
106.7 m 350 ft
(
)
121.9 m 400 ft
(
)
137.2 m 450 ft
(
)
Load Current (mA)
Length
F
IG:
fe
c_
wi
re
_
si
ze
_
le
n
g
th
1.5 mm (18 AWG)
2
0.8 mm (20 AWG)
0.6 mm (22 AWG)
N/A (24 AWG )