BCC BMS-Tec® – Paired Cables
PVC, PE or HFFR sheathed cables for BUS and Interface Systems
Applications
RS-232, RS-422, RS-485, KNX (EIB or Instabus), LonWorks, ModBus,
M-Bus, CAN-bus, BACnet, BMS (Building Management
Systems) or general interface systems.
Construction
Wire = conductor without or with insulation. With insulation sometimes also indicated as core.
Conductor: may be solid = one single rod or flexible = twisted bare or tinned copper strands, ranging from 12 to 24AWG.
Insulation: Polyethylene (PE) or Foam PE (FPE) for PVC (Polyvinyl Chloride) or Halogen-Free (HFFR) sheathed cables. And
Halogen-Free (HFFR) for HFFR sheathed cables. All insulations are in accordance with BS EN 50290-2, good strippable and coloured.
The colours are not interchangeable.
Pair = two twisted – colour coded – wires.
Individually screened pair (if applicable): one pair wrapped with an Aluminium/Polyester foil under which a drain wire.
Cable core: two or more (individually screened) pairs stranded.
Good twisting (lay-length < 30 ~ 40D) is necessary otherwise the cable can hardly be bending and will break after a few bends.
| Conductor (AWG) |
Configuration (AWG) |
Configuration (mm) |
DC Resistance (Ohm/km) |
|
|---|---|---|---|---|
| 24 | 7 x 32 | 7 x 0.20 | ≤ 88 | |
| 22 | 7 x 30 | 7 x 0.25 | ≤ 57.4 | |
| 20 | 7 x 28 | 7 x 0.32 | ≤ 32.16 | |
| 18 | 7 x 26 | 7 x 0.40 | ≤ 22.7 | |
| 16 | 19 x 29 | 19 x 0.28 | ≤ 15.47 | |
| 14 | 19 x 27 | 19 x 0.36 | ≤ 9.36 | |
| 12 | 19 x 25 | 19 x 0.45 | ≤ 5.61 |
Drain wire: (only in combination with a screen): stranded tinned copper wires. In order to avoid corrosion, it is recommended that drain wires are tinned.
Screen: (if applicable): Helically applied (= as a spiral) Aluminium/Polyester (Alpet) foil. For the flexibility of a cable a helically applied foil is to be preferred. A longitudinally applied foil act more as a stiff tube = more difficult to bend.
Braiding: (if applicable): tinned copper wires.
Sheath: grey PVC , black PE or purple HFFR, all in accordance with BS EN 50290-2.
