Auxiliary devices – GAI-Tronics DEX-101 Hazardous Area Driller's Intercom Station User Manual

Page 9

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Pub. 42004-679L2G

M

ODEL

DEX-10

X AND

DEX-20

X

D

RILLER

S

I

NTERCOM

S

TATIONS

Page 8 of 13

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Auxiliary Devices

Terminal block TB1 is provided for connection of the speaker, system cable, footswitch, and beacon.
This terminal block accepts a #12–22 AWG wire. Refer to Table 2 for the recommended conductor sizes.
Conductor ends can be stripped and terminated with or without a wire ferrule.

Table 2. Recommended Cable Sizes

Cable Use

Size

System

Digital: Two-conductor twisted pair, No. 22 AWG is typical
Analog: Four-conductor twisted pair (A/B twist; C/D twist), No. 22 AWG is
typical

Power

Three-conductor, No. 12 AWG is typical

Beacon

Two-conductor, No. 18 AWG is typical (for digital models only)

Footswitch

Two-conductor, No. 22 AWG is typical

Speaker Cable Two-conductor twisted pair, No. 18 AWG is typical

1. Install the system cable on TB1 system terminals A–D. Each system cable must be home run to the

Central. Digital stations require termination of a 2-conductor twisted pair cable on system terminals
A and B only. Analog stations require termination of a 4-conductor twisted pair cable (A/B twist &
C/D twist) on system terminals A–D. Refer to Table 3 for the maximum system cable lengths.

Table 3. Maximum System Cable Lengths

Digital Models

Analog Models

Cable Capacitance

No. 22 AWG

No. 20 AWG

No. 22 AWG No. 20 AWG

30.5 nf/1000 feet

6562 feet

6562 feet

4921 feet

6562 feet

13.7 nf/1000 feet

9843 feet

9843 feet

2. Install the speaker cable on TB1 Speaker terminals LS1 and LS2. Refer to Table 2 for recommended

conductor sizes.

3. Install the beacon control cable on TB1 terminals C1 and C2. This control output is available on

digital stations only. Refer to Table 2 for recommended conductor sizes.

4. Install the footswitch cable on TB1 terminals N.O. and C. Refer to Table 2 for recommended

conductor sizes.

After all connections are made, inspect and clean the machined and threaded surfaces of both the
termination cover and box. Clean the surfaces by wiping with a clean, lint-free cloth. Apply a light coat
of Killark LUBG lubricant to the cover threads. Install and hand-tighten the cover to the box.

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