BT Firepro-Tec® – Fire Resistant Cables
Four core BT Firepro-Tec PH120
BT Cables Part No: BTC1858– BTC1859 – BTC1860 – C1876
Screened four core Fire Resistant
cable for Building and Industrial
Standard Fire Alarm Cables
3 x Plain Annealed Copper wire
Silicon Rubber blend
Core 1: Blue
Core 2: Brown
Core 3: Black
Core 4: Grey
3. Cable Core lay-up
Two twisted wires 10 twists per
4. Drain Wire
Tinned Copper wire
6. Sheath Material
Halogen Free Flame-Retardant
Standard Put Up Length
100 and 500 metres
BT Security-Tec® – Coaxial Cables
Application and Construction of Coax Cables for 75 Ohm Video Systems
CCTV: Closed Circuit Television is the use of video cameras to transmit a
signal to a specific place, on a limited set of monitors
SMATV: Satellite Master Antenna Television used to deliver signals to
multiple dwelling units (e.g., apartment buildings and trailer parks).
CATV: Central Antenna Television = Cable television is a system of
providing television to consumers via radio frequency signals transmitted
to televisions. Nowadays also used for internet and telephone.
HDTV: High-definition television refers to video having resolution
substantially higher than traditional television systems.
Telecom and networking: a number of special cable constructions.
To prevent the outer conductor, or shield, from radiating, it is connected
to electrical ground, keeping it at a constant potential.
The dimensions and spacing of the conductors must be uniform
throughout the length of the cable. Any abrupt change in the spacing
of the two conductors along the cable tends to reflect radio frequency
power back toward the source. This acts as a bottleneck, reducing the
amount of power reaching the destination end of the cable.
Choosing the correct 75 ohm coax cable
Most coaxial cables for video applications have a nominal impedance of
75 ohms. Their differing electrical and physical characteristics make it
important to select the correct type of cable to suit the application.