Instruction manual

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