It is assumed that each device has an average load of 20 mA. If your devices average more than 20 mA per device, reduce the maximum cable length indicated in the table for that number of devices or reduce the number of devices on that segment.
| Number of field devices | Power supply load (mA) | Maximum distance (meters) |
|---|---|---|
| 1 | 20 | 1900 |
| 2 | 40 | 1870 |
| 3 | 60 | 1250 |
| 4 | 80 | 930 |
| 5 | 100 | 750 |
| 6 | 120 | 620 |
| 7 | 140 | 530 |
| 8 | 160 | 460 |
| 9 | 180 | 410 |
| 10 | 200 | 370 |
| 11 | 220 | 340 |
| 12 | 240 | 310 |
| 13 | 260 | 280 |
| 14 | 280 | 260 |
| 15 | 300 | 250 |
| 16 | 320 | 230 |
In any hazardous area installation it is important to read and follow the device manufacturer's design and installation documents. Failure to follow the documentation could result in an unapproved and unsafe application. Additionally, in hazardous locations follow your plant's procedures for making the area safe during installation and maintenance operations.