Contents - AP Technology

Technical Guidelines
Index, Determination of fire load
Definition Meaning/Reference
WAN Wide Area Network; extremely large or even global network. Various LANs are
generally connected to one another via WANs.
Wall thickness Thickness of a cable or sheath insulation system.
Watt Unit of power.
Wavelength Interval between two identical and consecutive oscillations in a periodic wave motion.
Waveguide Coaxial cable; conductor consisting of one conductive and one dielectric material
for low-loss transmission of high-frequency signals.
ZVEI Zentralverband Elektrotechnik- und Elektronikindustrie e.V.
(Central Association of Electrotechnology and Electronic Industries)
Determination of fire load
e.g. KAWEFLEX ® 4220-SK-C-PUR 4 G 10
Formula:
(cable weight - Cu weight) x Heating Value of most unfavourable material
Example:
Total weight: 656,0 kg/km
- Cu weight: - 464,0 kg/km
Plastic = 212,0 kg/km
Heating Value Hu for PELON ® = 25 kJ/g
Heating Value Hu for PU = 25 - 29 kJ/g (normal to flame resistant)
PUR average is assumed at 27 kJ/g equating to 27.000 kJ/kg
Calculation:
27.000 kJ/kg x 212,0 kg/km = 5.724.000,0 kJ/km = 5.724,0 MJ/km
there results from this the value:
5.724 MJ/km = 1.591,27 kWh/km (old units)
Fire load is = 1,59 kWh/m
Heating Values in kJ/kg: PVC 15,3 kJ/g
PE 46,5 kJ/g
PP 46,0 kJ/g
PELON ® 25,0 kJ/g
PUR 25,0 - 29,0 kJ/g
Conversion: 1 MJ/m2 equating to 0,278 kWh/m2 1 kWh/m2 equating to 3,6 MJ/m2 1 Wh/m2 equating to 3,6 kJ/m2 16.092