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Appendix C:
Users should make sure, for their own protection, that the electrical ground connections of the power utility,
telephone lines, and internal metallic water pipe system, if present, are connected together. This precaution may
be particularly important in rural areas.
The Ringer Equivalence Number (REN) assigned to each terminal device provides an indication of the
maximum number of terminals allowed to be connected to a telephone interface. The termination on an
interface may consist of any combination of devices subject only to the requirement that the sum of the Ringer
Equivalence Numbers of all the devices does not exceed 5.
Warning
To avoid electrical shock or equipment malfunction do not attempt to
make electrical ground connections by yourself. Contact the
appropriate inspection authority or an electrician, as appropriate.