INSTALLATION-WIRING DIAGRAMS
SECTION 200-096-209
FEBRUARY1991
BUILDING #l
BUILDING #2
TELEPHONE
&I Secondary protectors
PEMU PEMU
PCOU PCOU
1 I
E&M TIE LINE
CO LINE
HtiUHt Y-A-StWNDARY
PROTECTOR DIAGRAM
IMPORTANT!
To protect against transient voltages and currents, secondary protectors must be installed if
there is outside wiring (Figure 9-A). These protectors, which contain fast semiconductors in
addtion to fuses, shall comply with the requirements forsecondarypro tectors for communica tion
circuits, UL 497A. As of October I, 1990, the following manufacturers offer secondary
protectors that are UL listed.
9-2c