Wiring specifications for many public buildings now call for LFH cables to be used in certain areas, notably in corridors, risers etc. Under combustion circumstances LFH cables have a significantly reduced smoke emission and the gaseous products contain no toxic halogens.
VTS-LFH is technically identical to standard VTS, except that insulation and jacket materials are replaced by LFH (low fire hazard) materials. This makes no difference to the electrical properties, but the cable is very slightly stiffer.
Technical Specification:
| BBC specification: |
PSF1/9M (PUR jacket versions only) |
| Inner conductor: |
1/1.4mm silver plated copper (1.53mm²) |
| Dielectric: |
Cellular polyethylene, 6.3mm diameter |
| Outer conductor: |
95% cover braid 0.15mm silver plated copper |
| Intersheath: |
Solid polyethylene, 8.5mm diameter |
| Screen: |
95% cover braid 0.15mm plain copper |
| Jacket: |
LFH compound,11.0mm OD, red |
| Impedance: |
75 ohms ±3 ohms |
| Capacitance (nom): |
54pF/m |
| Attenuation at 1MHz: |
0.5dB/100m |
| Attenuation at 10MHz: |
1.60dB/100m |
| Attenuation at 100MHz: |
5.4dB/100m |
| Velocity ratio: |
0.8 (200MHz) |
| Max. voltage (peak): |
3.5kV RF |
| Weight: |
14.2kg/100m |
| Reel length: |
1000m |
| Cut lengths: |
Available in any multiple of 1 metre |
| Jacket marking: |
Printed with the words "DRAKA TRIAX 11 - Y - HDTV" |
'LFH' is a registered trademark of Canford Audio Limited.