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Installing the Control Unit
CAUTION:
Check these requirements with a simple, visual inspection; if you
cannot verify that the central office grounding requirements are met,
contact the central office. Do not connect the centrai office trunks
until you are ceflain that these requirements are met.
Heavy Lightning Protection
For most surges, adequate protection is provided by meeting the
requirements listed in the previous section, “Grounding 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
central office trunks.
One 147A protector provides protection for four central office trunks.
■ Connect a 146A protector to the 147A to provide protection for another
four trunks.
You can connect as many as three 146A protectors to a 147A, which
allows a maximum of 16 central office trunks on one 147A protector.
■ For more than 16 trunks, add another 147A protector and continue
adding 146As as needed.
See Table 2-3 for various configurations.
See Figure 2-4 for a typical 147A protector installation.
Power and Grounding
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