AT&T SPIRIT 371 Protector Assembly Installation Instructions Manual page 6

5. Selection of an Approved Ground
The first choice for approved ground uis some part of the power grounding system
(Figure 3). The National Electrical Code requires that the telephone and power
gorunds be bonded with No. 6 AWG copper wire or equivalent and that an
accessible means be provided at the electrical service for bonding other systems,
such as telephone systems, to the power. The bonding point means may consist
of an accessible metallic service entrance conduit, a power grounding conductor
(see the note below), or a connector located on the exterior of the power service
raceway or power service equipment (circuit breaker panel).
NOTE: In some cases this may be a ground conductor from the interior of the circuit
breaker panel which has been left accessible.
The approved ground should be installed according to NEC 800-2 and AT&T Practice
#462-005-100.
Grounding System
Figure 3
6. References
National Electrical Code Handbook, 1984, published by the National Fire Protection
Association.
AT&T Standard Practices. These are available from:
Support Services
AT&T
99 Jefferson Road
Room 2E09
Parsippany, New Jersey 07054
Telephone Number: 201-581-5685
Fax Number: 201-428-1878
AT&T Standard Practices include the following:
462-005-100, "Station Protection and Grounds"
676-300-100, "Electrical Protection — Stations and Customer Equipment"
518-010-105, "Key Telephone System, Ground and Special Protection
Requirements"
462-262-2xx (entire section of Practices), "Wiring at Terminals"
462-xxx-xxx (entire division), "Drop and Block Wiring"