GAI-Tronics 476-002 Centra-Page Flush-Mount Station - Manual (Page 4)

Pub. 42004-216B
Model 476-002 Centra-Page Flush-Mount Station Page: 4 of 7
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08/05
Wiring
The configuration of the cable coming into the Model 476-002 depends on the chosen wiring method. For
additional information, refer to Pub. 42004-356, Centra-Page Control Drawing 72979, and Pub 42004-
222, Model 10468-002 Centra-Page Central Cabinet. Figure 3 below illustrates the wiring terminations
inside the Model 476-002 Station.
Terminations L1, L2, P, and A correspond to identical terminations at the card rack assembly. These four
connections must be complete as two pair. The first pair, L1 and L2, serves as both the communications
path and the power supply. The second (control) pair provides party line selection or page line activation.
Terminations M1 and M2 are not used in typical installation.
The speaker conductors are connected directly to the associated speaker or driver.
Installing a Model 476-002 in a Division 1 area requires that the four station conductors terminate in a
safety barrier (10439-102) prior to entering the Division 1 area. This configuration creates intrinsically
safe wiring to the station. Speaker wiring may not pass through the station. Refer to Pub. 42004-356
Control Drawing 72979 for proper installation.
The wiring distance limitation for a handset station is specified as 10,000 feet without a hazardous area
safety barrier, and 3,000 feet with a barrier. This distance is determined by degradation from cable
capacitance more than cable resistance: the use of heavier wire will not fully compensate for a greater
distance.
Figure 3. Station Wiring Details