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CTX28 Installation
CTX28 Secondary Protection
Strata CTX I&M 06/04 1-23
CTX28 Installation
CTX28 Secondary Protection
The following diagram (see Figure 1-18) shows where secondary protectors must be installed for
outside wiring.
Figure 1-18 CTX28 Secondary Protector Diagram
Important! To protect against transient voltages and currents, solid state secondary protectors
must be installed if there is outside wiring. These protectors, which contain fast
semiconductors in addition to fuses, shall comply with the requirements for
secondary protectors for communication circuits, UL 497A. Care must be taken to
ensure that they are very well grounded to a reliable earth ground. Recommended
protectors are available in the fast Series 6 line from ONEAC Corp., Libertyville,
Illinois 60048, (800) 327-8801. Install and test the secondary protectors precisely to
the installation instructions of these manufacturer.
Standard
Telephone
Building #1
Building #2
Digital Telephone
Digital Telephone
or Cordless Base
MDFB
Loop CO Line
Secondary protectors – standard voltage
Secondary protectors – low voltage
GMAU
GCDU
GMAU
GDCU
DDSS
Console
HESB
DDCB
MDFB
GMAU
GSTU
7255
(Earth Ground)