1.1.1 CABLE CLASSIFICATION
The various cables are classified depending on the transmitted signals:
Category I
- Field bus, LAN (PROFIBUS, Ethernet, Devicenet…)
- Shielded data cables (RS232 …)
- Shielded cables for analogue/digital signals < 25V (sensors, load cells…)
- Low tension power supply cables (< 60V)
- Coaxial cables
Category II
- DC supply cables with tension > 60V and < 400V
- AC supply cables with tension > 25V and < 400V
Category III
- Power supply cables with tension > 400V
- Telephone cables
Category IV
- Any cable subject to lightning
1.1.2 RECOMMENDED DISTANCES AMONG CABLES
- When the cables are laid next to each other, these must be at the distances in the table below
- These distances are valid if in the air; these are reduced if the raceways are separated by grounded metallic shields.
- Different category cables can cross each other (90°)
Category I Category II Category III Category IV
≥ 100 mm
≥ 200 mm
≥ 500 mm
≥ 100 mm
≥ 500 mm
≥ 500 mm
1.1.3 MAXIMUM CABLE LENGTH
LOAD CELL CABLE
The maximum reachable length from the line using the appropriate load cell cable is:
- 50 m with cable 6 x 0,25 mm
2
- 100 m with cable 6 x 0,5 mm
2
Over 100 metres is necessary to use a 6x1 mm
2
cable
RS232 CABLE
The maximum reachable length from the line using the RS232 cable with a maximum baud rate of 19200, is about 15 m.
RS485 CABLE
The maximum reachable length from the line with the use of the appropriate cable for RS 485 connections (see section
5.1), is about 1200 meters.
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