Dk40I Secondary Protection - Toshiba DK14 Installation And Maintenance Manual

DK40i Secondary Protection

The following diagram (see
outside wiring.
Building #1
PSTU/KSTU2
RSTU/RSTU2
RDSU/RSTS
DK40i Base
KSU DKT
PEKU
PESU
PDKU
RDSU
RBSU or TBSU
REMU
TCOU, PCOU,
RCOU/RCOS
RGLU, RCIU/RCIS,
RBUU, RBUS, TBUU
RDDU
TDDU
5239
Figure 3-24 DK40i Secondary Protector Diagram
To protect against transient voltages and currents, solid state secondary protectors
Important!
must be installed if there is outside wiring, and on all DID and E&M Tie lines.
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 thee
manufacturer.
Strata DK I&M 5/00
Figure 3-23) shows where secondary protectors must be installed for
HDCB
or DDCB
NT-1
(Earth Ground)
Building #2
Standard
Telephone
HDSS or
Electronic or
DDSS
Digital Telephone
Console
Electronic or
Digital Telephone
or Cordless Base
MDFB
DDCB or
HDCB
BRI U
(Earth Ground)
E&M tie Line
Ground/Loop
CO Line
DID Line
DID Line
Secondary protectors – standard voltage
Secondary protectors – low voltage
DK40i Installation
DK40i Secondary Protection
HESB
MDFB
3-41