3Com RELEASE 2 installation manual Appendix C Grounding Requirements

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:

●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