Technical data

6
Envoy Installation, Commissioning & Operating Manual
ESD PRECAUTION
Electronic components are vulnerable to damage by Electrostatic Discharges (ESD). An ESD wrist
strap, suitably grounded, should be worn at all times when handling pcbs. These wrist straps are
designed to prevent the build up of static charges, not only within a persons body, but on many other
materials. ESD damage is not always evident immediately, faults can manifest themselves at anytime in
the future.
All pcbs should be stored in static shielded bags (silvered) for safe keeping, when not mounted in the
control panel. Do not use “black” or “pink” bags and never
allow pcbs to come in contact with bubble
wrap or expanded polystyrene (packing chips).
Static shielded bags and disposable wrist straps are available from the manufacturer.
Warning, Control Panel Access Keys
The keys to the control panel must be kept, safely, by a responsible person. Hazardous voltages may
be present. Access to the inside of the panel is not normally required. Disconnect mains supply prior to
opening cabinet.
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 NoBurn™, FP200™, Firetuff™, Firecel™, or any other cable complying with BS 6387
categories C, W, Z.
Mains Wiring
The mains supply to the fire alarm panel should be hard wired, using suitable three core cable (no less
than 1.0mm
2
and no more than 2.5mm
2
) or a suitable three conductor system that meets the
appropriate national wiring regulations. The panel should be fed from a double pole, isolating, switched,
fused, spur, fused at 3A. This should be secure from unauthorised operation and be marked ‘FIRE
ALARM: DO NOT SWITCH OFF’. The mains supply must be exclusive to the fire panel.
As an alternative to a switched fused spur, a double pole isolating device may be used (see diagram)
providing it meets the appropriate national wiring regulations.
NOTE: Any isolating device used, must have a minimum 3mm contact gap.
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