Myalarm V-LCD1 Manuale delle Istruzioni Scaricare il pdf (Pagina 31)

INSTALLATION

5-25

System 2 Installation / Programming Manual

Wiring Surge Protection

The wire between the transformer and the System 2 should be two conductor, stranded or solid, low voltage

wire of at least 18 AWG. Using a one nanosecond surge protection device installed at the 120VAC outlet, the

wire between the 16.5VAC transformer and the System must be at least ten feet long. The reason is: high

voltage transients travel about one foot per nanosecond. A one nanosecond device will require at least one

nanosecond for it to "start" clamping the surge and in one nanosecond, the destructive voltage has already

traveled one foot towards the System. A ten foot long connection will provide a safe margin. The idea is to

have the clamping action in place before the high voltage gets into the equipment.

Wire

We recommend eight conductor, non-twisted pair with shield, 22 AWG because it's common and generally

available. Plenum cable is available from Corby also. Do not use four pairs of twisted type cable.

Typical wire specifications for Keypads, Card Readers, and Data Chips* is an eight conductor, 22 AWG

stranded multiconductor with overall foil shield and non twisted pair; .032 in. (.81mm) PVC jacket, insulation

thickness .010 in. (.25mm), mutual capacitance per ft. 25-30 pf/ft. 300v, 80 degrees (C), UL style No. 2464,

CSA type SR-PVC. This wire must be multiconductor and not twisted pair. It should be noted that all

multiconductor wire has some overall twist, which is OK to use. The use of any other wire is experimental and

not supported by Corby. Any unused conductors may not be connected to ground or doubled up with active

wires. In some applications where not all features are used a cable with less conductors can be used.

Door Locks and Transformer connections require a two-conductor, 18 gauge wire (most popular is jacketed

multiconductor or twisted pair is also acceptable).

The optional Printer requires a three conductor, shielded cable, and the optional Video Display Terminal or PC

a minimum five conductor, shielded cable. Refer to the Installation Section or Wiring Diagrams for exact wire

connections.

Data Chip wire length can be extended by using a twisted pair for the data and negative wires of the

reader only. This optional method is the exception to the non-twisted rule. See the wiring diagram for

Data Chip readers for more information.

WARNING! Class II wiring practices must prevail as defined by the National Electrical Code. Wiring that

carries AC voltage may not be run in the same conduit or next to DC wiring of the System 2. Depending on

voltages and the actual type cable used, System operation may be a problem in areas with high electrical noise.

It is best to not run wires on or near fluorescent light fixtures.

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Myalarm V-LCD1 Manuale delle Istruzioni Pagina 31