Concept
Wire Sizes and Lengths for the RP-C-12A, -12B, and -12C Controllers
This section provides recommendations on wire sizes and lengths for the RP-C controller models RP-C-12A, -12B, and -12C.
The recommendations are for guidance only. Other wire sizes and lengths may be used, depending on wiring rules and when appropriate.
|
Terminals |
Minimum Cross-sectional Area |
Maximum Cable Length |
|
Power input terminals (1, 2) |
0.75 mm² (18 AWG) a |
According to local wiring rules |
|
Earth ground terminal (3) |
0.75 mm² (18 AWG) a |
According to local wiring rules |
|
Return (RET) terminals (4, 5), connected to ground rail |
1.3 mm² (16 AWG) |
As short as possible within the same panel, maximum 1.5 m (4.8 ft). |
|
Universal inputs/outputs as digital b inputs |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as analog c inputs |
0.34 mm² (22 AWG) |
100 m (330 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
0.75 mm² (18 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 75 °C (167 °F) |
1.5 mm² (15 AWG) |
150 m (500 ft) |
|
Universal inputs/outputs as temperature (thermistor) inputs, up to 150 °C (302 °F) |
1.5 mm² (15 AWG) |
75 m (250 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from the same transformer as the RP-C |
0.75 mm² (18 AWG) |
20 m (65 ft) |
|
Universal inputs/outputs, for actuators and transmitters powered from their own transformer (external or internal) |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Universal inputs/outputs as voltage outputs, for actuators powered from their own transformer (external or internal) or when the outputs have isolated converters |
0.34 mm² (22 AWG) |
200 m (650 ft) |
|
Relay outputs |
According to local wiring rules d |
According to local wiring rules d |
|
High power relay output |
According to local wiring rules d |
According to local wiring rules d |
|
Solid-state relay (SSR) outputs |
0.5 mm² (20 AWG) d |
According to local wiring rules d |
- Use wires rated for at least 90 °C (194 °F).
- Digital or counter inputs.
- Supervised, voltage, current, resistive, or 2-wire RTD temperature inputs.
- Confirm the voltage drop from the external load current and the wire resistance (the product of the wire size and length) to obtain the appropriate voltage arriving at the controlled field device (load), to reliably energize and maintain the control action.
I/O Wiring
Wire Sizes and Lengths
Wire Sizes and Lengths for the RP-C-16A Controller
RP-Cs
RP-C Screw Terminals
Wiring