This section provides recommendations on wire sizes and lengths for the AS-B servers.
For more information, see AS-B Servers .
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). |
RS-485 terminals (6, 7, 8, 9) |
For more information, see RS-485 Communications . |
For more information, see RS-485 Communications . |
Digital inputs and 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 AS-B sever |
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 |
Triac outputs |
0.5 mm² (20 AWG) d |
According to local wiring rules d |