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ZONE WIRING

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The CP manufacturer will dictate how their panel should be wired.
Parallel circuits are typically used for N.O. devices.
Series circuits are typically used for N.C. devices.

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Most panels today will allow either N.O. or N.C. devices on the same zone, its just a matter of wiring the zone in series or parallel.
You can also assign a zone as N.O. or N.C. zone using programming features through the keypad.

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Normally open and normally closed loops wired in series, two different switch symbols (devices) for representing the same thing.

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Normally open and normally closed loops wired in parallel, two different switch symbols (devices) for representing the same thing.

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Wiring diagrams for control panels will use either of the switch symbols shown on the previous slides.
The wiring diagrams may use two different abbreviations and symbols for the end of line resistor, EOL or EOLR.

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You will notice that each zone loop has an EOL (end of line resistor), these resistors monitor the line to detect tampering with the wiring.
End of line resistors for control panels range from 1000 ohms to 5600 ohms.
Most installers place the EOL in the panel, in order for the EOL to work properly it should be place in the last device in the loop.

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In an alarm system without resistors, a thief can bypass a sensor by cutting the wire on a normally open circuit, or by shorting the wires in a normally closed circuit.
Using normally closed circuits with properly placed resistors makes it harder to bypass the sensor.

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Because there is no EOL in this loop the CP can’t recognize the open, it see’s it as another N.O. device.

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The next two slides show a typical wiring diagram for a control panel and it can be found on the door of the CP and in the installation guide.
The screw terminals are assigned numbers which are printed on the circuit board and each device is wired to the appropriate terminal according to the wiring diagram.

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We’ll take a closer look at the ELK-M1EZ8 panel since its easier to read.
We’ll start with the various component hook ups like the battery, power transformer, keypad and siren.

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We will start with the side terminal and work our way down and then across the bottom terminal strip.

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The battery must be a minimum 12V- 5Amp hour (Ah), connected to the red/black terminals labeled battery.

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The transformer is a 16.5 volt AC, 45 volt amp, class 2 power limited device, notice that there is no (-) or (+) terminal, it doesn’t matter how the leads connect to these two terminals. This is where the 18 AWG lamp cord is installed.

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The color code must be maintained, if using quad POTS cable substitute the white lead with the yellow conductor of the POTS cable.

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When hooking up the siren the polarity must be maintained, notice that there is an additional note associated with the siren install.

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Output 3 is an auxiliary form C output.

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By moving the jumper over you can make zone 8 a 2 wire smoke detector zone, not moving the jumper keeps zone 8 as a normal detection zone.

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Here is the note that goes with the previous slide, notice that the max number of smokes is 20.

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+VAUX is a 12VDC power output used for PIRs and glass break detectors, +VSMK is the power output for 4 wire smoke detectors.

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The next set of terminals are the 8 detection zones, the “NEG” terminal is the common between two zones.

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These zones require a 2200 ohm EOL, each zone can be wired as a combination series parallel circuit.
Parallel wiring is for N.O. devices and series wiring is for N.C. devices.
Many devices will also provide the option of wiring them as either N.O. or N.C.

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The last set of terminals shows how the RJ-31X is wired into the panel.
There is an LED to indicate when the line is seized by the auto dialer.
The RJ-31X will be covered in detail later in another lecture.

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That covers all of the basic connections that incorporate all of the components of a burglar alarm system.
When making connections to the terminal strip it is a good practice to use electrical spade connectors for wiring installed in the panel, this should be done after the system is up and running correctly.

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During the installation process you can simply slide the conductors up into the screw terminals, do not make loops around the screw terminals.