Introduction; Definitions; Battery Return (Br); Battery Return Reference (Brr) - Nortel DMS-100 Series Maintenance Manual

1 Introduction

The following definitions conform as closely as possible to those of the
National Electrical Code (NEC) and the Canadian Electrical Code (CEC).

1.1 Definitions

battery return (BR):

A conductor that carries the –48 V return current. Although BR conductors
are not grounding conductors, they are referenced to ground by the battery
return reference (BRR) conductor of the serving dc power plant.

battery return reference (BRR):

A grounding conductor used to connect battery return to ground.

bonding:

The permanent joining of non-current carrying metallic parts to form an
electrically conductive path, which ensures electrical continuity and the
capacity to safely conduct any current likely to be imposed upon the path.

bonding network (BN):

A set of interconnected conductive structures that provides an
electromagnetic shield for electronic systems and personnel at frequencies
from dc to low rf. The term electromagnetic shield denotes any structure
used to divert, block, or impede the passage of electromagnetic energy. In
general, a BN need not be connected to earth, but all BNs considered in this
document require an earth connection.

building principal ground (BPG):

The main point within a building at which the ground reference potential is
established. The BPG is directly referenced to earth by such means as water
pipes and/or electrodes driven into the earth.

common bonding network (CBN):

The principal means used for bonding and grounding inside a
telecommunications building. It is the set of metallic components that are
intentionally or incidentally interconnected to form the principal bonding
network in a building. These components include: structural steel or
DMS-100 Family Power and Grounding Routine Maintenance Manual Applies to all BCS/PCL levels
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