Siemens Cerberus PYROTRONICS MXL Operation, Installation, And Maintenance Manual page 251

PSR-1, NET-4, NET-7, NET-7M Connections and Ratings
4 - 84
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Class B wiring can be used to obtain
the maximum of 40 CZM-1B6s. Each
Class B wire run can support a maxi-
mum of 20 CZM-1B6s, 4 ohms max.
Multiple Class B power connections
can be used if you do not exceed the
ratings above (40 CZM-1B6s max and 4
ohms per run max). For example, you
could have four individual Class B
power runs, for a total of 40 devices
(for example, 12, 8, 6, and 14 CZM-1B6s)
with each of the four runs not exceed-
ing 4 ohms resistance.
T-tapping is allowed, provided the total
resistance of all wires does not exceed
4 ohms.
The following figures show wiring
instructions for the PS-5A:
PS-5A Power, Class A Wiring
firealarmresources.com
1
2
3
CLASS B WIRING
+
4
_
CZM-1B6
5
6 CZM-1B6
TB3
T-TAPPING ALLOWED
CZM-1B6 Power, Class B Wiring
PS-5A Power, Class B Wiring
18-31 VDC
2A MAX
POWER LIMITED TO
NFPA 70 PER NEC 760
4 OHMS MAX PER
PAIR (TOTAL)
18 AWG MIN