Clad series SB-RS 485
Shielded Pair and Multipairs
Steel wire armour (SWA)
Suitable for Fieldbus distribution circuits in RS 485 systems. Through this system a multiple-node net can be interconnected by means of a paired cable, which allows bi-directional communication, significant length of the interconnection cable and high speed data transmission. Installed in conduits, trays, cable ladders, in direct open air or indoors, buried in a trench or in ducts. It has additional mechanical protection.
Features
Temperature rating: 75°C
Voltage rating:: 300 Volt
Construction requirements: As per UL13
Conductor requirements: As per ASTM B8 Clase B
Conductor: Tinned annealed electrolytic copper, 7-wire stranding
Insulation: Thermoplastic compound
Lay length: 50mm (20 twists/m)
Shield: Aluminium-polyester tape wrap (100% coverage) plus tinned-copper braid (90% coverage)
Armour: Galvanized steel wire armour
Sheath: Flame retardant PVC; sunlight and hydrocarbon-resistant
Fire requirements: As per UL 1685
Hydrocarbons standard: As per NFC 32-200 – ASTM D 1239
Oils requirements: As per ICEA S 73-532
Outdoors requirements: As per UL 2556 (UV rays)
NEC code (NFPA 70): Art. 725 PLTC – Art. 727 ITC – Art. 800 CM – Art. 501 classified areas CL1 Div.2 y Cl2 Div.2
Connection: The maximum length for the RS 485 cable is 1200 meters , without the use of amplifiers. For longer distances, a signal re-generation and amplification device must be used. The RS485 is a bus series cable, therefore, the installation of equipment in star or ring is not allowed . It is recommended to avoid the passage of these cables near cables and power equipment, which produce electromagnetic induction which may cause the system malfunction.
Electromagnetic interference protection
Double shielding
Fire-retardant
Hydrocarbon resistant
Mineral oil resistant
UV resistant
Identification
| Standard | ||
|---|---|---|
| Sheath | Conductors | |
| 1 Pair |  |   |
| 2 Pairs | |  |
| 3 Pairs | |  |
| 4 Pairs | |  |
Instalation
Constructive variants
The information provided corresponds to the standard version, and different alternatives of insulation and / or covering can be used upon request.
ELECTRICAL CHARACTERISTICS, DIMENSIONS & WEIGHT
| Number of pairs | Gauge | Electrical resistance in D.C. at 20°C | Velocity of propagation | Impedancia característica | Mutual capacitance | Diameter under armour | External diameter | Weight | Code | |
|---|---|---|---|---|---|---|---|---|---|---|
| AWG | ohm/km | VP (%) | Ohm | pF/m | pF/ft | mm | mm | kg/km | ||
| 1 | 24 | 92.7 | 66 | 120 | 44 | 13.4 | 6.6 | 10.7 | 231 | SB 9701 H |
| 2 | 8.7 | 12.9 | 304 | SB 9702 H | ||||||
| 3 | 9.4 | 13.5 | 335 | SB 9703 H | ||||||
| 4 | 10.7 | 14.8 | 389 | SB 9704 H | ||||||
pF/m: Mutual Capacitance between conductors of the same pair, expressed in picofarad per meter. pF/ft: Mutual Capacitance between conductors of the same pair, expressed in picofarad per feet.