Page 19 - Electrical Safety of Low Voltage Systems

CHAPTER1

Basic Definitions

and Nomenclature

Defendit numerous.
In numbers safety.
iuvenalis (circa 60–120 bc)

1.1 Introduction
Any discipline has its own language, basic definitions, and nomen-
clature. These elements are crucial for a deep understanding of the
core of the discipline itself. With this in mind, the following text de-
scribesbothfundamentaltermsandschematicsthatwillbeintensively
used throughout this book. They constitute a very effective tool for
comprehending the influence of the state of the neutral (i.e., system
grounding) on electrical safety of low-voltage systems.

1.2 Basic Definitions and Nomenclature

1.2.1 Basic Insulation
The insulation applied to live parts and necessary to provide basic
protection against electric shock.

1.2.2 Class 0 Equipment
Equipment outfitted only with the basic insulation and no bonding
terminals.

1