Fusion FBUL NP12-12, Инструкция по установке и наладке

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Fusion Installation & Commissioning Manual Approved document No UI-FBU-01 issue 3.0
11
INSTALLATION (Continued)
Cable types and limitations
To comply with EMC (Electro Magnetic Compatibility) regulations and to reduce the risk of electrical
interference in the system wiring, we recommend the use of screened cables throughout the
installation.
Acceptable, commonly available, screened cables, which can be used on both the sounder and
detector circuits include FP200™, Firetuff™, Firecel™, MICC (Pyro™) or any other cable complying
with BS 6387 categories C, W, Z.. Refer to BS 5839 pt1 clause 26 for detailed information on cables
wiring and interconnections.
Cabling
Suitable cables should be brought into the cabinet using the knockouts provided via a suitable cable
gland recommended for use with that cable. The screen or drain wire of loop circuits should be
bonded to earth at one location only, and should be continuous throughout the circuit. Drain wires
should be terminated in the cabinet using the 4 way brass earthing terminal block provided.
Integrity of transmission paths
To satisfy the requirements of EN45 -2. and to ensure a reliable system, it should be designed and
maintained to local design and installation regulations.
The Fusion has loop isolators included in the panel, and external loop isolators must be included in
the loop wiring. A single short circuit fault will only disable devices in the section of wiring between
isolators. In the case of a single open circuit no devices will be lost, since monitoring will be from both
ends of the loop, a fault will be indicated in this circumstance.
A design issue with any analogue fire system is the combined effect of loop resistance, loop
capacitance and the current demand of items connected to the loop. Factors that influence this
include loop length, cable diameter, cable type, the number of isolators used and the number and
type of devices between isolators. We recommend the use of the Apollo loop calculator program
which can be used to check the integrity of a proposed installation. The following guidelines can be
used as a rule of thumb.

Maximum addressable loop length = 1km, with either 1mm2 or 1.5mm2 cables.

Maximum conventional Radial length = 500 metres, either 1mm2 or 1.5mm2 cables.

Approx 20 addressable devices between loop isolators of which no more than 6 should
be loop sounders.

Maximum 32 conventional detectors per radial circuit. Note a radial circuit must not
cover more than one physical zone area.

If loop sounders are used, use 1.5mm2 cable and do not fit more that 32 loop sounders
per loop in total.

Where conventional sounders are used, use 1.5mm2 cable and do not fit more than 22
sounders per radial circuit in total.