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Module 1

Definitions of Terms
• Bonded (Bonding) : Connected to establish electrical continuity and conductivity
• “Bonding Jumper”
• “Equipment Bonding Jumper”
• “Main Bonding Jumper”
• “System Bonding Jumper”
• “Supply-side Bonding Jumper”
Article 100 & 250.2
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Definitions of Terms
• Bonding Conductor or Jumper : A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected
• Equipment Bonding Jumper : The connection between two or more portions of the equipment grounding conductor
Article 100
4

Equipment Bonding Jumper
Article 100
5

Definitions of Terms
• Main Bonding Jumper : The connection between the grounded circuit conductor and the equipment grounding conductor at the service
• System Bonding Jumper : The connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system
• Note that both complete the ground fault return path to the source
Article 100
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Main Bonding Jumper
Article 100
7

Definitions of Terms
• Supply-side Bonding Jumper
• A conductor installed on the supply side of a service or within a service equipment enclosure(s), or for a separately derived system, that ensures the required electrical conductivity between metal parts required to be electrically connected.
250.2
8

Supply-side
Bonding jumper
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Definitions of Terms
• Ground : The earth
• Grounded (Grounding): Connected
(connecting) to ground or a conductive body that extends the ground connection
• Equipment grounding conductors and bonding jumpers extend the ground connection
Article 100
10

Definitions of Terms
• Grounding : Describes elements that directly or indirectly make connections to earth
• “Equipment Grounding Conductor”
• “Grounding Electrode”
• “Grounding Electrode Conductor”
Article 100
11

Definitions of Terms
• Equipment Grounding Conductor (EGC) : The conductive path(s) that provides a groundfault current path and connects normally non– current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.
• Informational Note No 1: It is recognized that the equipment grounding conductor also performs bonding.
Article 100
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Equipment Grounding Conductor
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Definitions of Terms
• Grounding Electrode : A conducting object through which a direct connection to earth is established
• Grounding Electrode Conductor : A conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on a grounding electrode system
Article 100
14

Grounding Electrode and Conductors

Definitions of Terms
• Grounded Conductor : A system or circuit conductor that is intentionally grounded
• Ungrounded (Conductor) : Not connected to ground or to a conductive body that extends the ground connection
Article 100
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Definitions of Terms
• Neutral Point : The common point on a wye connection in a polyphase system or midpoint on a single-phase portion of a single-phase, 3wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system.
• Informational Note - this is where the vectorial sum of voltages of all other phases using the neutral with respect to neutral is zero
Article 100
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Neutral Point
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Definitions of Terms
• Neutral Conductor : The conductor connected to the neutral point of a system that is intended to carry current under normal conditions
Article 100
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Neutral Conductor and Neutral Point
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Neutral Conductor Definition
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