Lucent Technologies MERLIN LEGEND Release 5.0 Installation Manual page 64

MERLIN LEGEND Communications System Release 5.0
Installation 555-650-140
Installing the Control Unit
AC Power and Grounding
Heavy Lightning Protection
For most surges, adequate protection is provided by meeting the previously
listed requirements. Additional protection is required when the customer is
located in a heavy lightning area.
Connect a 147A protector to the system to limit surges from the AC lines and up
to four CO trunks.
For systems with more than four CO trunks, do the following:
Connect a 146A protector to the 147A protector, providing protection for
an additional four trunks.
Connect up to three (maximum) 146A protectors to a 147A protector,
allowing a maximum of 16 trunks on one 147A protector.
For more than 16 trunks, add another 147A protector and continue
adding 146A protectors as needed. See
configurations and
Table 2-3. Heavy Lightning Protection
Number of CO Trunks
1–4
5–8
9–12
13–16
17–20
21–24
Figure 2-4 for a typical 147A protector installation.
Required Protectors
147A
147A and one 146A
147A and two 146As
147A and three 146As
Second 147A
Second 147A and one 146A
Table 2-3 for various
Issue 1
June 1997
Page 2-15