CTX28 Installation
AC Power and Grounding Requirements
1-4 Strata CTX28 I&M 3/05
AC Power and Grounding Requirements
The CTX28 requires a earth ground connection for proper operation. The two-wire AC power cord
connects to a standard AC power outlet, and does not provide a ground connection. The ground for
the CTX28 must originate at the building’s main power distribution panel and have a solid
connection to earth ground. Use a an insulated, stranded copper wire to connect the TB3 terminal
on the GMAU to earth ground. This wire should be 10 AWG or larger. The total resistance from
TB3 to the ground point must not exceed one ohm. Connect the ground wire to the common
ground point or ground rod, usually located at the utility entrance of the building. (See Figure 1-2.)
Check local codes.
Figure 1-2 Ground and AC Power Cord
&$87,21 Lack of proper ground may cause improper operation and, in extreme cases,
system failure.
:$51,1* Failure to provide a proper ground may be a safety hazard to service
personnel or lead to confusing trouble symptoms, such as noise on the talk
path including GVMU greetings and messages. In extreme cases, system
failure may result because the system is not properly protected from
lightning or power transients.
AC Adapter Cord
plugs into GMAS
TB3 on GMAU
Dealer-supplied wire
(#10 AWG gauge or
larger to pass ground
specification test)
CTX28 Cabinet
AC Voltage
100 VAC to 240 VAC (50 or 60 Hertz)
7126
AC Current
1.5 amps max.
TB2
TB1 to HPFB6 FG
(#10 AWG Wire)
P10 Wire Connector
to HPFBG Battery Connector
Required
connection
Grounding Rod
or
Electrical Building
Ground (Main
Power
Distribution Box)
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