BT BMS-Tec® – Paired Cables
PVC, PE or HFFR sheathed cables for BUS and Interface Systems
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.
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.
|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.