Installation; Cable Type And Cable Size Guide - Videx VR120DK-1 Technical Manual

Initial Installation Checks
T
he wiring diagrams towards the back of this manual should be followed carefully. Heavy duty
conductors on wiring diagrams are shown heavily outlined in some instances where voltage drop is
experienced then these wires should be doubled up.
• Check that all components are free from damage before installing (Do not proceed with the instal-
lation in the event of damage).
• Keep all packaging away from children.
• Do not obstruct the ventilation openings or slots on any of the devices.
• All connections to mains voltages must be made to the current national standards (IEE Wiring regu-
lations)
• Install an appropriate fused spur or isolation switch to isolate the mains.
• Isolate the mains before carrying out any maintenance work on the system.
• All intercom and access control cables must be routed separately from the mains.
Lock Release Wiring and Back EMF Protection
W
hen fitting an electric lock release back EMF protection will be required. If fitting an AC lock release
then a 100nF ceramic disc capacitor must be fitted across the terminals on the lock. If fitting a DC
lock release (fail secure or fail safe) then a 1N4002 diode must be fitted across the terminals on the lock.

CABLE TYPE AND CABLE SIZE GUIDE

Cable Types
T
he following cable types described below are measured in mm² for the cross sectional area (CSA) for
each conductor (core) within the cable bundle. The tables show the distances in metres between
system components. All cable types are catagorised using the AWG (American Wire Gauge).
Suitable cables for this system are a BT type telephone cable CW1308 and a YY cable (other similar or
equivalent cables are also suitable). When selecting a particular cable type care must be taken to ensure
that excessive voltage drop is avoided and the lowest possible resistance is achieved. Use the following
cable types and the tables as a guide to ensure that the best possible performance is achieved.
VR120DK-1 TECHNICAL MANUAL EDITION 1.1

INSTALLATION

THE POWER TO SECURE
Page 9