Zeta Alarm Systems.
Classic 2000 Mk II Operation Manual
Revision 1.0
Part # MAN-Z3K-01
Page 11
To determine your loop length measure from the farthest device on the loop back to the Classic
2000 Mk II or Remote Addressable Communication Module. When measuring a “T” tap, go from
the farthest device on the “T” tap section back to the main SLC loop and from that junction back to
the panel.
1.4.8.3 Network Wiring
Network communication wiring requires a shielded, twisted pair of wires between each device. In
addition, all network devices require battery backed 24VDC power. Twisted, shielded pair may be
required for some installations. Following are examples of acceptable net wire.
Network Communication
14-18 AWG min
Twisted Pair–
14 AWG
Belden 9580
16 AWG
Belden 9572
18 AWG
Belden 9571
Twisted, Shielded Pair
14 AWG
Belden 9581
16 AWG
Belden 9575
18 AWG
Belden 9574
Network Power
18 AWG
1.4.9 CalculatingMaximum Current Draw and Battery Backup Requirements
This section will assist you in determining the maximum system current draw and standby battery
needs for your installation. Follow the steps below to determine the current draw and standby bat-
tery requirements. Appendix B-- Classic 2000 Mk II Current Draw/Battery Backup lists the alarm
current draw for the panel, ZACM Loop Cards, and serial device expansion modules.
Alarm Current is determined by multiplying the quantity of items by its alarm current draw. To
quickly determine maximum system current draw, perform the following computations:
1. Enter Quantity of ZACMs in the system.
2. Fill in the quantities of addressable devices and multiply by their alarm current requirements.
Record the total in the Maximum Alarm Current columns. Fill in the quantity of SLCs in the
system (number of ZACMs times 2). Multiply the number of loops by the maximum alarm cur-
rent per loop, then sum the columns.
3. Fill
in
the
quantities
and current draw of the Notification Appliances or auxiliary-powered
devices for each output from the manual for each specific device, and compute the total cur-
rent required. Record in the NAC Alarm Current column Line D.
4. Total the current required for Alarm conditions in Amps and multiply by 1.2 for safety factor.
5. Make sure the total alarm current you calculated (including current for the panel itself) does
not exceed 5.75 Amps (7.5 Amps part # Z3000-6008). This is the maximum alarm current
allowable. The ZIPB-3 or other independent, listed, regulated 24VDC supply with battery back-
up that is listed for fire alarm system use may be used to add additional power to the system.
