AT&T Network Adapter 25 Installation And Maintenance Manual page 44

INSTALLATION
A single-point ground (SPG) system in which the green wire ground
(system ground) and the telephone company ground are connected
to approved building ground.
The coupled bonding conductor must be connected between the
telephone company ground at the building entrance and System 25's
SPG.
Surge protection on the ac power to System 25.
For greater than 99 percent of all lightning strikes, the protection outlined
above will do the job.
described protection may not be sufficient. External secondary protection,
located at the trunk access area of the System 25 cross-connect field, can be
employed.
Several commercial units are available.
used, a very convenient device is the LP5-230-220 Fused Lightning Protector.
This unit plugs into the 66-block (in place of the shorting bars) and includes
the sneak current fuse. One unit is required per protected pair. A ground
bar is provided with the lightning protection units or can be ordered
separately (Comcode 901-007-120). All lightning protectors located in the
System 25 cross-connect area must be grounded to System 25's SPG via a
#6AWG copper wire.
In addition, an AC Surge Suppressor (Tll Model 428) may be required. Local
practice should be followed. The unit plugs directly into one of the quad
outlets and provides a dual outlet to protected equipment. Sufficient units
should be provided to protect all at-powered equipment. Each cabinet in the
system requires a protected outlet, and in addition, a protected outlet is
required for each auxiliary unit, such as the SAT, a tape unit, or a printer.
When a Surge Suppressor is used, all peripheral equipment directly
connected to System 25 must be connected to alternating current via the
Surge Suppressor.
2-20
However, there are a few locations where the
If 66-type block terminations are