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 significantly reduced smoke emission, and the gaseous products contain no toxic halogens.
DKM-LFH is of similar construction to standard DKM, except that the PVC jacket is replaced by LFH materials. The performance is unchanged, although the bending radius is slightly greater as LFH materials are not as flexible as PVC.
Technical Specification:
| Conductors: |
1/0.4mm (0.126mm²) plain copper |
| Insulation: |
High density polyethylene, OD 0.88mm, according to BT CW1308 Cable Colour Codes |
| Lay-up: |
Two insulated conductors twisted together, pairs laid up together, and wrapped with polyethylene tape |
| Screen 1: |
Aluminium/polyester tape (aluminium side out) |
| Screen 2: |
Aluminium/polyester tape (aluminium side in), wound opposite direction to screen 1 |
| Drain wire: |
1/0.4mm tinned copper wire, between screens |
| Overall jacket: |
LFH material, turquoise |
| Overall diameter: |
DKM-LFH5 6.0mm, DKM-LFH10 7.7mm, DKM-LFH25 11.5mm |
| CPR Euroclass: |
Eca |
| Minimum bending radius: |
75mm |
| Impedance: |
110 ±10 ohms |
| Conductor resistance: |
15 ohms/100m |
| Velocity ratio: |
66% |
| Propagation delay: |
Any pair in the cable 243ns/50m (min.), 253ns/50m (max.) |
|
Max. difference between any two pairs in the same cable 5.0ns |
| Step response: |
10-50% transition time 4.5ns/50m (min.), 6.5ns/50m (max.) |
|
10-90% transition time 50ns/50m (min.), 110ns/50m (max.) |
| Crosstalk: |
25dB minimum |
| Weight (kg/100m): |
DKM-LFH5 4.3, DKM-LFH10 7.0, DKM-LFH25 15.0 |
| Reel length: |
500 metres |
| Cut lengths: |
Available in any multiple of 1 metre |
'LFH' is a registered trademark of Canford Audio Limited.