Magnum Inspections Inc. Serving South Florida Since 1994 Martin County: (772) 214-9929 Broward/Palm Beach Counties: (954) 340-6615 Email me at: ev@magnuminspections.com |
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What is Bonding? Bonding [100]. The permanent joining of metal parts together to form an electrically conductive path that has the capacity to conduct safely any fault current likely to be imposed on it. See Image Above ! Mike's Comment: Bonding is accomplished by the use of conductors, metallic raceways, connectors, couplings, metallic-sheathed cables with fittings, and other devices recognized for this purpose [250.11]. Bonding Jumper [100].
A conductor properly sized in accordance with Article 250 that ensures
electrical conductivity between metal parts of the electrical installation. Author’s Comments: Wire Type. A bare or insulated conductor [250.11(1)] Rigid Metal Conduit [250.11(2)] Intermediate Metal Conduit [250.11(3)] Electrical Metallic Tubing [250.11(4)] Listed Flexible Metal Conduit as limited by 250.11(5) Listed Liquidtight Flexible Metal Conduit as limited by 250.11(6) Armor of Type AC cable [250.11(] Armor of Type MC cable as limited by 250.11(10) Metallic Cable Trays as limited by 250.11(11) and 392.8 Electrically continuous metal raceways listed for grounding [250.11(13)] Surface Metal Raceways listed for grounding [250.11(14)]
(4) Bonding Conductive Materials to an Effective Ground-Fault Current Path. To remove dangerous voltage from ground faults, electrically conductive metal water piping systems, metal sprinkler piping, metal gas piping, and other metal-piping systems, as well as exposed structural steel members that are likely to become energized, must be bonded to an effective ground-fault current path. Figure Above Author’s Comment: The phrase "likely to become energized" is subject to interpretation by the authority having jurisdiction. (5) Effective Ground-Fault Current Path. Metal raceways, cables, enclosures, and equipment, as well as other electrically conductive materials that are likely to become energized, must be installed in a manner that creates a permanent, low-impedance fault-current path that facilitates the operation of the circuit overcurrent device. Figure 250–22 Author’s Comment: To assure a low-impedance ground-fault current path, all circuit conductors must be grouped together in the same raceway, cable, or trench [300.3(B), 300.5(I), and 300.20(A)]. Figure 250–23 The earth is not considered an effective ground-fault
current path. Special thanks to Mike Holt! Please click the link above to visit his site!
Martin County: (772) 214-9929 Broward/Palm Beach Counties: (954) 340-6615 Email me at: ev@magnuminspections.com |
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