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BT 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.

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