Notifier SLC Wiring Manual — P/N 51253:U9 12/3/2021 71
Appendix B: SLC Surge Suppression
B.1 Introduction
Primary and secondary UL-listed surge protectors used with fire alarm control panels must have the following characteristics:
• Primary Surge Protector: Must be listed against UL 497, standard for surge protective devices with a marked rating of 330V or less
• Secondary Surge Protectors: Must be listed against UL 497B the Standard for Protectors for Data Communications and Fire Alarm
Circuits with a marked rating of 50V or less
One primary surge protector must be used with each SLC wiring pair whenever SLC wiring runs outside the building.
• Install primary protection only as shown in this document.
• Refer to NEC Article 800 and local building code requirements.
Additional primary surge suppressors may be added as required by the NEC. Add these additional suppressors in series with the SLC
wiring at the building entry/exit.
Wiring connected to the surge suppressor output must remain within the building while wiring connected to the surge suppressor input
may be routed outside the building as shown below.
B.2 Installation
Mounting of the secondary surge suppressor must be inside a separate UL-listed enclosure.
• Locate on an available stud and secure with nut.
• Unit is connected in series with the SLC Loop to protect the Control Panel.
• Provide a common ground to eliminate the possibility of a differential in ground potentials.
NOTE: For detailed information refer to the installation documentation supplied with the unit.
S
L
C
-
s
s
b
u
i
l
d
2
0
2
1
.
w
m
f
Building #2
Building #1
P = Primary
S = Secondary
Surge Suppressor
FACP
P
P
P
P
S
S
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