National Electrical Code grounding and bonding requirements tested on electrician licensing exams, beyond the general exam basics deck.
36 cards · basic cards · AI-written, checked twice. Edit anything.
- What is the purpose of equipment grounding?
- To provide a low-impedance path for fault current back to the source to safely clear overcurrent protective devices.
- What conductor must be used for equipment grounding in most circuits?
- Copper or aluminum equipment grounding conductor, which can be bare, insulated, or covered.
- For a 20-amp circuit, what is the minimum size equipment grounding conductor?
- 12 AWG copper or 10 AWG aluminum.
- For a 60-amp circuit, what is the minimum size equipment grounding conductor?
- 10 AWG copper or 8 AWG aluminum.
- For a 200-amp service, what is the minimum size equipment grounding conductor?
- 2 AWG copper or 1 AWG aluminum.
- What is bonding?
- Connecting conductive parts to ensure electrical continuity and low impedance for fault current.
- What must be bonded together in a kitchen sink area with a dishwasher?
- The sink and any accessible conductive parts, including the dishwasher frame and water lines.
- What is the maximum distance from a ground rod to a water meter or shutoff?
- The ground rod must be bonded to the water pipe within 5 feet of the meter or main shutoff.
- When a main water shutoff or meter is installed, what must be bonded across it?
- A bonding conductor to maintain electrical continuity in the grounding path.
- What size bonding conductor is required to bond a water pipe serving as a grounding electrode?
- The same size as the equipment grounding conductor but not larger than 1/0 AWG copper or 3/0 AWG aluminum.
- For a gas pipe entering a building, when must it be bonded?
- It must be bonded to the service equipment grounding conductor or the grounding electrode conductor within 6 feet of the point where it enters.
- What is the primary difference between a main grounding electrode and a bonding conductor?
- Grounding electrodes establish the reference to earth; bonding conductors connect conductive parts to maintain continuity.
- What is an effective grounding path?
- A permanent, continuous, low-impedance conductive path that can safely carry fault current.
- May copper and aluminum be in direct contact in a grounding conductor installation?
- No, they must be separated by an insulating material or protected in a corrosion-resistant environment to prevent galvanic corrosion.
- What is the purpose of a ground-fault circuit interrupter (GFCI)?
- To disconnect power when it detects a ground fault current to prevent electrical shock.