![Norstar DR5 Installer'S Manual Download Page 36](http://html1.mh-extra.com/html/norstar/dr5/dr5_installers-manual_1705695036.webp)
30 installation
Internal wiring requirements
All new or existing wiring for
telephones must meet the
following specifications:
one twisted pair per telephone
a dc loop resistance less than 59
cable length (0.5 mm or 24 AWG) not to exceed 305 m
(1000 ft)
use of a
Station Auxiliary Power Supply (SAPS) to
extend the loop up to 790 m if the cable is longer than 305 m
(1000 ft)
no bridge taps
WARNING
Installers should also check the lightning protectors at
the cable entry point to the building with special attention
to the grounding. Any problems should be reported to
the telephone company in writing.
telephone
wiring should not leave the buildings as it is not
lightning-protected.
Mounting requirements
If a smooth surface is not available, cut a backboard large
enough to accommodate the system modules and the distribution
block. The system module physical dimensions are listed in this
chapter.
Equipment ‘for mounting the modules
screwdriver, diagonal cutters, pliers, connecting tool, pencil,
level (optional)
four 1
long wood screws for the KSU and four for
each of the expansion modules
(1 %-in) long screws for the cable troughs
thick wooden backboard (if necessary)
Modular DR5 Installer Guide
Summary of Contents for DR5
Page 2: ......
Page 45: ...Module installation 39 Installing the cable troughs Modular DR5 Installer Guide ...
Page 76: ...70 Telephone relocation and replacement Modular DR5 Installer Guide ...
Page 164: ...158 Set Copy ...
Page 244: ...238 Problems with optional equipment Modular DR5 Installer Guide ...
Page 266: ...260 Glossary Modular DR5 Installer Guide ...
Page 294: ...12 Call Display services Modular DR5 System Coordinator Guide ...
Page 516: ...234 Glossary Modular DR5 System Coordinator Guide ...
Page 526: ...244 Index Modular DR5 System Coordinator Guide ...
Page 529: ... I J I I I I I I ...