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INSTALLATION-WIRING DIAGRAMS
SECTION 100-816-208
MARCH1993
BUILDI NG #l
BUILDING #2
KCDU
: 7
r-l
m STANDARD
DDCB Y
TELEPHONE
OR OTHER
DEVICE
DSS
CONSOLE
(DK16 only)
HESB
DIGITAL OR
ELECTRONIC
TELEPHONE
- -
DIGITAL OR DIGITAL OR
ELECTRONIC ELECTRONIC
TELEPHONE TELEPHONE
, ,
q
Secondary protectors
q
Secondary protectors
DK8 KSU
DK16 KSU
BASE UNIT
KCDU
PCOU
QCDU
CO LINE
HtiURE 8-l
SECONDARYPROTECTORDIAGRAM
IMPORTANT!
To protect against transient voltages and currents, secondary protectors must be installed if
there is outside wiring (Figure 8-l). These protectors, which contain fast semiconductors in
addition to fuses, shallcomply with the requirements forsecondaryprotectors for communication
circuits, UL 497A. As of October I, 1990, the following manufacturers offer secondary
protectors that are UL listed.
8-5