ADEMCO VISTA 10, Engineer'S Manual

Page: 6 / 28

6
Cabling
The product has high voltage barriers between the mains supply (excessive voltage),
the alarm wiring terminals (safe extra low voltage), and the telephone line terminals
(Telecom network voltage). Each control is individually tested before it leaves the
factory to ensure the integrity of these barriers. It is essential that these barriers are
maintained in the way the cables enter the cabinet, are routed inside the cabinet, and
routed externally. The routing of the cables as shown in the diagram must be fol-
lowed precisely.
Knockouts, rear entry points and a trunking entry point is provided for cable entries.
Additional holes must not be cut in the enclosure. Where necessary, the cable must
be protected at the entry point by the use of grommets. The cables external to the
cabinet must be either firmly affixed to the fabric of the building using suitable clips
or saddles, or mechanically protected in conduit or trunking. Alarm system cables
must not be allowed to loop inside the cabinet – they must be trimmed as shown.
It must not be possible to put strain on the wiring within the control cabinet by
pulling on cable external to the cabinet.
Knockouts or the trunking entry point must only be removed if cables are to enter the
cabinet at that point. The hole must be covered by the trunking or conduit or by
means of a blanking grommet.
It must not be possible to push a finger or similar size object or instrument into any
hole or cable entry point.
Mains Supply Connections
WARNING: THIS APPARATUS MUST BE EARTHED
Connection to the mains supply must be made by a competent, qualified person
(e.g., NICEIC-approved) in accordance with the current IEE and local supply regu-
lations. The earth impedance of the mains input earth must be verified.
A means of isolation from the mains supply must be provided within 2 metres of the
control. This is normally a switched fused spur fitted with a 3 amp fuse.
Where a flexible cable is connected to the control having cores coloured green-and-
yellow, brown, and blue, it is important to connect the wires according to the follow-
ing code:
Green-and-yellow: Earth – connect to terminal marked E.
Blue: Neutral – connect to terminal N.
Brown: Live – connect to terminal L.
Where a non-flexible cable is connected to the control having cores coloured red,
black, and a green-and-yellow sleeve covering the earthing conductor, it is impor-
tant to connect the wires according to the following code:
Green-and-yellow: Earth – connect to terminal marked E.
Black: Neutral: – connect to terminal N.
Red: Live: – connect to terminal L.
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