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EXTERNAL GROUNDING
If the CO line protector is properly grounded and bonded to ac power, most
lightning damage will be prevented.
NOTE: In areas of the country with frequent lightning activity or
severe ac transient voltage, additional protection is strongly
recommended.
Either of the following methods are acceptable:
●
●
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Install an AT&T model 147A Protector for ac and CO lines. The
147A Protector has a capacity of four CO lines. If you have five to
eight telephone lines, also use a model 146A Protector, an add-on
unit for CO lines.
Install a Coupled Bonding Conductor (CBC) according to Figure
46.
As shown in Figure 46, the CBC runs from the primary protector
ground wire along the route of the inside wire, around the
network interface, and to the ground of the MERLIN Plus system.
The CBC can be implemented using the shield of a shielded cable
or a No. 14 or heavier gauge solid conductor tie-wrapped to the
communications wire.
In some states the Local Exchange Carrier (LCE), the serving
telephone company will provide upon request, a CBC connection at
the network interface. The equipment ground is then connected to the
LEC-supplied ground at the network interface.
Appendix C: Grounding Requirements
63