Specifications

1 Connect the test set between the protector ground lug and the
ring side of the CO line.
2 If the dial tone is present, the protector is grounded.
3 If there is no dial tone, the protector is not grounded; notify the
COG as stated in step 7, above.
4 One of the following methods is recommended for additional
protection for those sites that are frequently exposed to lightning
activity and have a history of damage to electronic equipment:
l Install an AT&T model 147A (ac and CO line) protector. The
147A protector has a capacity of four lines. If you have five to
eight telephone lines, use a model 146A CO line protector
add-on unit.
l Install a Coupled Bonding Conductor (CBC) according to
Figure 8-3.
FIGURE 8-3 Typical MERLIN Plus system grounding plan.
Attach bonding
conductor to the
control unit
R
To
co T
(
AC
Conduit
Q
Outlet
Ground
,,’ B
wire bond
Closely coupled bonding
0 (\
w
Power
conductor. Use cable shield
1 1 GND kveen) Service
or No. 10 AWG tie-wrapped
to cable.
Cold water pipe
or other approved
ground
Bond wire
Power
ground rod
-
MERLIN Plus System Installation 8-5