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Maximum Number of SLC Devices
A total of 127 addressable devices can be used with the system.
Wiring SLC devices in Style 4 (Class B)
No special wire is required for addressable loops. The wire can be untwisted, unshielded, solid or stranded as long as it meets the National Electric Code 760-51 requirements for power limited fire protective signaling cables.
Maximum wiring resistance is 50 ohms.
Maximum loop length depends on the wire gauge.
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Wire
Gauge
|
Max.
Distance
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22
AWG
|
1500
feet
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18
AWG
|
3900
feet
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16
AWG
|
6200
feet
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14
AWG
|
10,000
feet
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The figures below show how wire length is determined for out-and-back tap and T-tap style wiring.
When using T-taps, the total length of all taps and the main bus must not exceed 40,000 feet. This requirement must be met in addition to the maximum distance requirements for the various gauges.
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