Notifier ID50 SERIES, Installation, Commissioning & Configuration Manual

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ID50 Series Panel - Installation, Commissioning & Configuration Manual
Inst
allation Guide - Cabling
21 997-263, Issue 4
September 2002
3.2 Cabling Installation Notes
3.2.1 Introduction
The following notes are intended to assist installers of
analogue addressable control systems. They have been
produced from information derived from the supplier’s
technical resource and from information fed back
concerning existing systems.
3.3.2 Quality of Cable and of Cable Installation
It is vitally important that good quality cable is used, and
that correct installation techniques are followed. In general,
the following cable installation requirements must be met:
a. All cable sections must be circular to allow effective
cable clamping using the cable glands.
b. The cable must be screened (sheathed) to provide
protection against Radio Frequency Interference (RFI)
and the screen must be connected to earth at the
control panel.
c. Multiple earthing of the screen should be avoided.
NOTIFIER’s field products use insulated mounting
bases and back boxes to achieve this. We recommend
that this practice be continued if other connections are
made. To achieve this with MICC cable may require
the use of insulated cable glands at one end of the
cable.
d. The screen must be continuous throughout the loop.
e. The maximum resistance of the loop should not
exceed 40 ohms. You may check this by joining the
return legs IN+ and IN- together and measuring across
the start legs OUT+ to OUT-. Also the cable
capacitance should be less than 0.5µF. Typically this
will allow a maximum loop length of 2000m of screened
1.5mm
2
cable. Cable recommended for use is MICC
with a LSF PVC overcovering, a fire-resilient cable to
BS7629 or PVC/SWA/PVC to BS6387.
Recommended Cables:
Cable Type Manufacturer Cable Name Type Number Application
Foil Screen Pirelli FP200 - All
Foil Screen Pirelli FP200 Gold - All
Foil Screen Draka Firetuf FTZ 2E1.5 All
Copper Clad BICC MICC CCM2L1.5RG All
Foil Screen H & S Radox FR Comms All
Foil Screen Draka - FDZ 1000 Data Comms
Foil Screen AEI Firetech F2C1.5E Data Comms
7/0.2 mm Arrow - 7-2-4S External RS232
4-core, screened (e.g. Printer)
f. We recommend that the system should be wired in
2-core cables and each 2-core cable should be specific
to one function.
g. The RS485 communication cable used should be rated
as suitable for up to 200mA in a short circuit condition.