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MERLIN LEGEND Communications System Release 6.1
Installation
555-661-140
Issue 1
August 1998
Installing the Control Unit
Page 2-15
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 Table 2–3 for
various configurations and Figure 2-4 on page 2-16
for a typical
147A protector installation.
NOTE:
When you use the second 147A, you can connect the 146As in any
combination, up to a maximum of three 146As per 147A.
For detailed installation instructions, see the documentation
packaged with the protectors.
Table 2-3. Heavy Lightning Protection
Number of CO Trunks Required Protectors
1–4 147A
5–8 147A and one 146A
9–12 147A and two 146As
13–16 147A and three 146As
17–20 Second 147A
21–24 Second 147A and one 146A