Lecture 8 Grounding and Bonding Part 1

Shop Practice with Electrical Code: Grounding and Bonding part 1 Jayson Bryan E. Mutuc, REE, RME BSEE-PUP MSEE, Major in Power Systems -MIT (candidate)

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Article 2.50 Grounding and Bonding This Article contains requirements for grounding and bonding. These entail providing a path(s) to divert high voltage to the earth, requirements for the low-impedance fault current path to facilitate the operation of overcurrent protection devices, and how to remove dangerous voltage potentials between conductive parts of building components and electrical systems.

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Bonding (p.7) Bonding (Art 1.1) – permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely imposed

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Bonding Jumper (p.7) Bonding Jumper (Art 1.1) – A reliable conductor to ensure the required conductivity between metal parts required to be electrically connected.

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2.50.1.2 Ground-Fault (p.190) Ground Fault – An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally noncurrent carrying conductors, metallic enclosures, metallic raceways, metallic equipment or earth

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2.50.1.2 Ground-Current Path (p.191) Ground Fault Current Path– An electrically conductive path from the point of the ground fault on a wiring system through normally non-current carrying conductors, equipment, or the earth to the electrical supply source

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2.50.1.2 Effective Ground-Fault Current Path (p.190) Effective Ground Fault Current Path – An intentionally constructed, permanent, lowimpedance electrically conductive path designed and intended to carry current under ground-fault conditions from the point of a ground fault on a wiring system to the electrical supply source and that facilities the operation of the overcurrent protective device or ground fault detectors on high impedance grounded system 7

Effective Ground-Fault Current Path The effective ground-fault current path is intended to help remove dangerous voltage from a ground fault by opening the circuit overcurrent protective device.

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Grounding Conductor, Equipment (p.14) Grounding Conductor, Equipment (Art 1.1) – The conductor used to connect non-current carrying metal parts of equipment, raceways, or other enclosures to the system grounded conductor, the grounding electrode conductor or both, at the service equipment or at the source of a separately derived system. 9

Ground (p.13) Ground (Art 1.1) – A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth or to some conducting body that serves place of the earth Grounded (Art 1.1) – connected to earth or to some conducting body that serves in place of the earth 10

Grounding (Earthing) Conductor (p.13) Grounding Conductor (Art 1.1) – A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes.

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Grounding Electrode (p.14) Grounding Electrode (Art 1.1) – A device establishes an electrical connection to the earth

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Grounding Electrode Conductor (p.14) Grounding Electrode (Art 1.1) – The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded, or to both at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at the source of separately derived system.

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Bonding Jumper, Main (p.7) Bonding Jumper, Main (Art 1.1) – The connection between the grounded circuit conductor and the equipment grounding conductor at the service

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Grounded, Solidly (p.13) Grounded, Solidly (Art 1.1) – Connected to ground without any inserting any resistor or impedance

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