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Installing the Control Unit
Table 2-3. Heavy Lightning Protection
If you have
this number of
central office trunks . .
.
Connect these protectors
1-4
147A
5-8
147A and a 146A
9-12
147A and two 146As
13-16
147A and three 146As
17-20
Two 147As and three 146As
See the note below.
21-24
Two 147As and four 146As
See the note below.
NOTE:
When you use the additional 147A, you can connect the 146As in any
combination, up to a maximum of three 146As per 147A. For example, if
you have only enough wall space for two 146As and a 147A, put two
146As with the first 147A, and then put the third 146A with the additional
147A.
2-16
Power and Grounding