47
SLC ADDRESSABLE DEVICE CIRCUIT WIRING / OPERATION COMPARABLE TO NFPA CLASS A
(or ULC DCLA)
Class A (DCLA) provides redundant communication paths.
- S_AN
+ S_AP
- S_BN
+ S_BP
ISOLATOR
MODULE
SEE NOTE
SEE
NOTE
SEE
NOTE
ISOLATOR
MODULE
SEE NOTE
ISOLATOR
MODULE
SEE NOTE
SEE
NOTE
SEE NOTE
SUPERVISED
POWER LIMITED
PORT-A PORT-B
Notes:
• Siemens SLC Devices: Detectors, Monitor Modules, or Control Modules up to a maximum of 50
devices. A maximum of 20 devices recommended between Isolator Modules. A Maximum of 15
Isolator Modules per addressable device circuit.
• If more than one HCP is used on a SLC device loop, the loop must be wired Class A (DCLA) or the
riser conductors must be installed in accordance with the Survivability From Attack By Fire
requirements in the National Fire Alarm Code, NFPA 72. If wired Class A (DCLA), at least one HLIM
loop isolator must be installed between each HCP and between the panel and the first and last
HCP. See the HLIM installation instructions for the maximum number of isolators allowed per loop
and other wiring instructions.
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