5.2 Appendix 2 – Recommended Fire Rated Cables
The following table provides a list of suitable fire rated cables with standard (30 minute) and enhanced (120
minute) classification. Refer to Document No. 680-088 for an up to date list.
Firetec Multicore Ref. F1C
Firetec Armoured Ref. F1C
Irish Driver-Harris Co Ltd
Irish Driver-Harris Co Ltd
Mineral Insulated Twin Twisted PYRO-E CCM2T
Pyrotenax Served Mineral Insulated Cable (light
and heavy duty)
Mineral Insulated Cable (light and heavy duty)
5.2.1 Detector Loop Lengths – Apollo, Hochiki and AV
With the above cables, loops can be up to 2Km in length. However, care must be taken when designing the
system to take into account the maximum loop loading. The voltage drop (load current x cable resistance) over
the cable always needs to be taken into account to ensure the devices receive an adequate supply voltage. The
following table gives recommendations for a loop. (It may be possible to extend the lengths where the devices
are distributed evenly – refer to the device data sheets and Loop Calculators for further information on
calculating loop loading, cable cross sectional area and loop distance).
Maximum Circuit
Impedance
Maximum Capacitance
(Core-Core)
Maximum Capacitance
(Core-Screen)
Insulation Resistance
(Core-Core and Core-
Screen)
NB: Maximum Circuit Impedence is the sum
of the resistance of both cable conductors.
See Nittan addendum for maximum line lengths with the Nittan protocol
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