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Prof. D. Wilton ECE Dept.

ECE 2317 Applied Electricity and Magnetism. Prof. D. Wilton ECE Dept. Notes 5. Notes prepared by the EM group, University of Houston. Grounding. Grounding: connecting a conductor to the physical earth. Safety reasons Noise reasons. equipment. water pipe. equipment. +. V AB = 0.

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Prof. D. Wilton ECE Dept.

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  1. ECE 2317 Applied Electricity and Magnetism Prof. D. Wilton ECE Dept. Notes 5 Notes prepared by the EM group, University of Houston.

  2. Grounding Grounding: connecting a conductor to the physical earth • Safety reasons • Noise reasons equipment water pipe

  3. equipment + VAB = 0 - water pipe Grounding (cont.) • Ensures that there is no voltage drop between equipment and ground • Ensures that there is no electric field outside of equipment • Ensures that there is no charge build up on equipment

  4. equipment ground Grounding (cont.) Ground symbol: Note: grounding is NOT is the same thing as a reference point. (However, when a circuit is grounded, the ground is OFTEN chosen as a reference point of zero volts.)

  5. A + 12 [V] 100  - B ground Example reference point (choose 0 [V]) Find: voltage at the ground VG

  6. Grounding (cont.) hot neutral (grounded back at junction box) ground

  7. Grounding (cont.) wall I hot + junction box V - neutral ground The neutral wire is grounded back at the junction box. Note: The voltage of the neutral wire at the device is not the same as ground, because the neutral wire has a resistance.

  8. Ground Protection The metal casing of an electrical device is normally connected to ground. hot neutral ground

  9. GFCI (Ground Fault Circuit Interrupter) Ih Ig = Ih - In hot neutral In GFCI Circuit trips when Ig > 5 [mA]

  10. Double Insulated Tool Ih plastic case hot neutral In The device is surrounded by an insulating plastic case. It does not require a ground.

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