Dk40I Secondary Protection - Toshiba Strata DK14 Installation And Maintenance Manual

DK40i Installation

DK40i Secondary Protection

DK40i Secondary Protection
The following diagram (see
outside wiring.
RGLU, RCIU/RCIS
4240
Figure 3-24 DK40i Secondary Protector Diagram
Important!
3-40
Figure
Building #1
PSTU/KSTU2
RSTU/RSTU2
RDSU/RSTS
DK40i Base
KSU DKT
PEKU
PESU
PDKU
RDSU
HDCB
or DDCB
RBSU or TBSU
NT-1
REMU
TCOU, PCOU,
RCOU/RCOS
RDDU
TDDU
(Earth Ground)
To protect against transient voltages and currents, solid state secondary protectors
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.
3-24) shows where secondary protectors must be installed for
BRI U
(Earth Ground)
E&M tie Line
Ground/Loop
CO Line
DID Line
DID Line
Secondary protectors – standard voltage
Secondary protectors – low voltage
Building #2
HESB
Standard
Telephone
HDSS or
Electronic or
DDSS
Digital Telephone
Console
Electronic or
Digital Telephone
or Cordless Base
MDFB
DDCB or
HDCB
Strata DK I&M
MDFB
5/99