Design Guidelines for Cabling Systems

Bonding and Grounding

Outline

- Introduction

Bonding and its purpose

Grounding and its purpose

Surge current and its source

Ground Loops

Examples of Grounding and Bonding

Introduction

Definition: A surge is an increase of at least ten percent in current

and voltage that typically lasts only a few microseconds.

Although the duration of a surge is very short, voltage can

rise to as much as a few thousand volts.

Primary Cause of Surge

Lighting - can result in immediate, catastrophic failure

of electronic equipment.

Secondary Cause of Surge

Electrical transients - occur when reactive loads, such as

motors and compressors in Air

Conditioning Units are switched

on and off.

These transients are the silent killers of electronic

equipment for they often occur with no outward

indication.

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