Grounding versus bonding pdf

Grounding and bonding as electrical installation protocols overlap to a certain extent, but they are not identical. Bonding is the process of connecting to conductive objects together. Bonding is the lasting joining of metallic pieces to form a conducting path which ensures safe electrical continuity. In 1974, mike realized there was a need for quality electrical training and opened mike holt. Typical ground resistance requirements which one to follow. Grounded or ungrounded you must bond enclosures and equipment together. The purpose of this article is to clarify the difference and to discuss important aspects of both grounding and bonding systems. He was a journeyman electrician, master electrician, and electrical contractor.

Bonding and grounding in institutional, commercial, and industrial buildings is very important. Keep in mind that equipment grounding conductors and bonding. The grounded circuits of machines need to have an effective return path from the machines to the power source in order to function properly. Article 250 grounding and bonding mike holt enterprises. A groundedneutral conductor is a system or circuit wire that is intentionally grounded. Pay careful attention to the definitions that apply to grounding and bonding both here and in article 100 as you begin the study of this important article. Earthing and grounding are actually different terms for expressing the same concept. Bonding is more clear word compare to grounding and earthing, but there is a micro difference between grounding and earhing.

Grounding electrode system and grounding electrode conductor part iii znec 250. What is the difference between bonding, grounding and earthing. The terms grounding and bonding are found throughout the nec text, and while they are seemingly interchangeable, they are actually two distinct procedures when it comes to the national electrical code and installing electrical equipment the act of grounding versus bonding is so important, in fact, that the nec codemakingpanel cmp had actually proposed to replace the term. They each have different functions, but they work together to make the buildings electrical wiring safe. Grounding and bonding are important elements of a buildings electrical wiring system. What is the difference between bonding, grounding and. One of the most misunderstood and confused concept is difference between bonding, grounding and earthing. Understanding the differences between bonding, grounding. The code defines bonded or bonding as connected connecting to establish electrical continuity and conductivity. The machines circuits should be provided with a return path starting from the machines to the source of power to work properly. Any intentional or accidental connection between an electrical circuit or instrument and the earth is known as grounding. Understanding the differences between bonding, grounding, and earthing. Making sure that all of the metallic components of a traffic signal system are wellgrounded. The grounding device shall be removed from the normally energized conductor, line or equipment first.

Grounding and bonding grounding is the process of connecting a system, equipment, or both to the earth. All code references are based on the 2005 national electrical code. Grounding and bonding means that conductive parts are connected together and to the earth. The importance of bonding and grounding in commercial, industrial, and institutional buildings cannot be overstated. In bonding, the emphasis is on creating lowimpedance electrical connections between two or more conductive metallic bodies that are not normally currentcarrying. The difference in ungrounded systems you are bonding the equipment together. Bonding is generally done as protection from electrical shocks. Groundingandbonding nationalelectricalcode article250 by. The connection between the grounded circuit conductor and the supplyside bonding jumper, or the equipment grounding conductor, or both, at a separately. Grounding versus bonding many individuals confuse grounding and bonding of a traffic signal system. Mike holt worked his way up through the electrical trade from apprentice electrician through electrical contractor, to become one of the most recognized experts in the world as it relates to electrical power installations.