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Cable and wire length guidelines
Table 5 defines cable length guidelines for the various wire sizes that you can use to wire low-voltage (<30 V) input
and outputs.
Table 5: Cable length guidelines and recommended wire sizes for low-voltage (<30 V) inputs and outputs
Wire size or gauge and type
1
Guideline
A
2
1.5 mm
(18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
N/A (24 AWG) stranded copper
B
2
1.5 mm
(18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
0.6 mm (22 AWG) stranded copper
N/A (24 AWG) stranded copper
C
See Figure 8 to select wire size or
gauge. Use stranded copper wire.
1.
The required wire sizes and lengths for high-voltage (>30V) relay outputs are determined by the load connected to the relay
and local, national, or regional electrical codes.
Maximum cable length versus load current
Use Figure 8 to estimate the maximum cable length relative to the wire size and the load current in mA when you
wire the inputs and outputs.
Note: Figure 8 applies to the low-voltage (<30 V) inputs and outputs only. The load that is connected to the relay
and local electrical codes determines the required size and length for high-voltage (>30 V) relay outputs.
Figure 8:
Maximum wire length for low-voltage (<30 V) inputs and outputs by current and wire size
Length
137.2 m (450 ft)
121.9 m (400 ft)
106.7 m (350 ft)
91.4 m (300 ft)
76.2 m (250 ft)
61 m (200 ft)
45.7 m (150 ft)
30.5 m (100 ft)
15.2 m (50 ft)
0 m (0 ft)
0
1.5 mm (18 AWG)
0.8 mm (20 AWG)
0.6 mm (22 AWG)
N/A (24 AWG )
50
150
100
PEAK® IOM57 Input/Output Modules Installation Instructions
Maximum cable length
and type
457 m (1,500 ft) twisted
wire
297 m (975 ft) twisted wire
183 m (600 ft) twisted wire
107 m (350 ft) twisted wire
229 m (750 ft) twisted wire
137 m (450 ft) twisted wire
91 m (300 ft) twisted wire
61 m (200 ft) twisted wire
See Figure 8 to determine
cable length. Use twisted
wire cable.
2
200
250
300
Load Current (mA)
13
Assumptions
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.
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.
N/A
400
450
350
500
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