INSTALLATION
37
6.3.2
RECOMMENDED CABLE TYPE
6.3.2.1
CONVENTIONAL CIRCUITS
The cable selected for interconnection to the control equipment should meet the requirements of
any national codes (eg, BS5839) or relevant approval bodies. Cables should not normally have a
cross sectional area of less than 1mm
2
for solid conductors or 0.5mm
2
for stranded conductors.
Cable temperature rating must allow for an increase in the enclosure temperature of 25° above
ambient.
The following cables are generally recommended for use:
a) Shipwiring Cable to BS6883.
b) PVC insulated cable to BS6004, run in screwed steel conduit to BS4568 Part 1.
c) 16/0.2mm twin or multi-core cable to DEF Standard 61-12 (Part 5), run in
screwed steel conduit to BS4568 Part 1.
d) PVC insulated cable to BS6231, Type BK, run in screwed steel conduit to
BS4568 Part 1, or plastic conduit to BS4607, or trunking. (Conductors having a
cross-section of less than 1mm2 should not be drawn into conduit but can be run
in trunking).
e) Mineral insulated cable, twin or multi-core, to BS6207 Part 1, with all cable
terminations and fittings supplied by the manufacturer of the cable.
f)
PVC insulated, PVC inner sheathed, steel wire armoured and PVC oversheathed
cable to BS6346.
g) Cabling and conduit for flameproof circuits must comply with BS EN60079-
14:2003.
h) For the FV312 series, the EExe junction box must be mounted within 0.6m of the
detector.
6.3.2.2
CABLE ROUTING
All interconnecting cables should be run in conduit or trunking which is reserved exclusively for
fire alarm circuits. Where such separation is not possible MICC cable should be used.
Particular care must be taken to ensure that detector wiring is not run close to a.c. power circuits.
6.3.3
CABLE ENTRY SEALING
CAUTION:
CABLE GLANDS AND STOPPING PLUGS MUST BE SUITABLY SEALED TO
PREVENT THE INGRESS OF MOISTURE.
Only cable glands incorporating an inner cable seal should be used. In exposed outdoor areas, it
is recommended that a shroud be fitted over the cable glands. Cable glands should also be sealed
to the detector housing by fitting a nylon washer between their flange and the housing.
In applications where the ambient temperature is expected to be 40
o
C or higher, cable glands with
a silicon inner seal must be used and, when fitted, the shroud must be made of CR rubber.
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