Rev B Doc. 6001072 Page 13 of 28
B. Line Interface Board Cabling
The following cables must be run for a multiple entrance installation:
a. 2 conductor shielded cable from the LIB to the 120 VAC outlets for the 12 VAC, 20 VA
transformesr supplied by Sentex (or a 12 VDC power supplies that you provide). Up to 10 LIB's
may be powered by each transformer. See Table 4 for the required wire sizes.
b. 4 twisted pair cable between the connector boards of each LIB housing in the stack, as shown
in Figure 8. Refer to the figure for which pairs that need to be twisted for a multiple unit
installation with multiple LIB housings (diagram applies only to installations with multiple LIB
housings).
NOTE: Belden 8757 for unshielded installations and Belden 9504 for shielded installations (or
equivalent) is recommended.
Figure 8. Multiple Entrance LIB Cabling.
DC POWER
WIRE SIZE
DISTANCE AC POWER
WIRE SIZE
18 AWG 30' and under 16 AWG
18 AWG 30'-75' 12 AWG
14 AWG 75'-150' 10 AWG
12 AWG 150'-250' -----
10 AWG 250'-500' -----
Table 4. Multiple Entrance LIB Cabling Power Wire Distance.
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