Requirements of cables
The British Standard BS5839 Part 1 : 2002 Code of practice for
system design, installation, commissioning and maintenance
states the requirements for standard and fire resisting cables in
Clause 26.2 section d and e.
"d) Standard fire resisting cables should meet PH 30
classification when tested in accordance with EN50200 and
maintain circuit integrity if exposed to the following test:
- a sample of the cable is simultaneously exposed to flame at a
temperature of 830ºC- 0+40ºC and mechanical shock for 15min,
followed by simultaneous exposure to water spray and
mechanical shock for a further 15min.
e) Enhanced fire resisting cables should meet the PH120
classification when tested in accordance with EN 50200 and
maintain circuit integrity if exposed to the following test:
- a single sample of the cable is simultaneously exposed to flame
at a temperature of 930ºC - 0+40ºC and mechanical shock for a
period of 60min, followed by simultaneous exposure to water
spray and mechanical shock for a further 60min."
"
The cables listed in this manual are those that
have been tested for EMC compliance with the system
products.
Loop Cable usage
"
There is a maximum limit of 1Km loop cable
usage allowed per loop circuit. This maximum limit is the
sum of the cable used on main loop circuit, spurs off
main loop circuit, plus cable runs to all input / output
lines off loop powered interface units installed on the
loop.
There is a further maximum limit of 100m cable run
allowed per input/output line off loop powered interface
unit.
Mains Supply cable
The mains supply cable must be a standard fire resisting type
and should meet PH30 classification, such as any of the standard
and enhanced cables listed above.
Repeat indicator to Control panel cable
A maximum of 1Km cable distance is allowed between Control
Panel and Repeat indicator panel
¨
Belden No. 9842 EIA RS485 Applications, O/A
Beldfoil® Braid having two twisted pairs
Loop cable
A loop cable carries both data and power, therefore its selection
is important. Note the following:
¨
In countries where the European EMC directive is in
force, only EMC Compliant cables are to be used.
¨
The loop cable usage must not exceed 1Km. This
includes the cable used on main loop and spur circuits.
¨
Single pair cable must be used. It is NOT permissible
to run mixed loops or outgoing and return pairs in a
multi core cable, due to inadequate separation and
possible electrical interference problems.
¨
Each core of the loop cable must be 1.5mm
2
cross
section area.
¨
The cable screen must be capable of being earthed at
each system device.
¨
Red is the preferred cover sheath for fire applications.
¨
The specified loop circuit cables are also suitable for
wiring master alarm, auxiliary relay, input/output lines
and mains supply.
Enhanced cables
¨
Mineral insulated cable (MICC) to BS6207:Part 1
¨
Approved Enhanced cable:
Draka Firetuf Plus Enhanced FTPLUS2EH1.5RD
Standard cables
Approved EMC cables for loop wiring
¨ Draka Firetuf EMC Standard 1.5mm
2
FTEMC2EH1.5RDR
¨
Draka Firetuf FTZ2E1.5 FIRETUF OHLS *
fire resistant data cable
¨
Raydex CDT FG950 *
¨
Cavicel SpA FIRECEL SR 114H *
distributed by Cables Britain
¨
AEI Cables FIRETEC *
¨
BICC Pyrotenax FLAMESIL FRC *
¨
Datwyler LIFELINE *
¨
Alcatel cable PYROLON E * distributed by Winstonlead
¨
Huber & Suhner RADOX FR *
¨
Pirelli FP200 FLEX *
¨
Pirelli FP200 GOLD *
"
The cables marked * utilise laminated
aluminium tape with a tinned drain wire for electrostatic
screening. Under certain environmental conditions
galvanic action may take place between the aluminium
and the drain wire. This will severely degrade EMC
performance as the foil to drain wire impedance will
increase. Armoured variants of these can also be used
for wiring a loop circuit.
7
SenTRI ONE System
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