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Questions and Answers
What is the minimum diameter of the rebar required for grounding metal lighting standards?
What is the minimum diameter of the rebar required for grounding metal lighting standards?
- Five-eighth inch
- Three-fourth inch
- One inch
- One-half inch (correct)
What is the maximum length of copperweld ground rod specified for metal lighting standards?
What is the maximum length of copperweld ground rod specified for metal lighting standards?
- Fifteen feet
- Five feet
- Ten feet (correct)
- Twenty feet
Which code editions must the bonding jumper comply with after December 31, 2020?
Which code editions must the bonding jumper comply with after December 31, 2020?
- 2023 edition, National Electrical Code
- 2017 edition, National Electrical Code
- 2020 edition, National Electrical Code (correct)
- 2014 edition, National Electrical Code
What size must the bonding jumper be at a minimum if copper is used?
What size must the bonding jumper be at a minimum if copper is used?
How must the ground rod be positioned relative to the metal standard base?
How must the ground rod be positioned relative to the metal standard base?
To which conductor must the grounding electrode conductor connect?
To which conductor must the grounding electrode conductor connect?
What height is defined for a pole to be classified as a lighting standard?
What height is defined for a pole to be classified as a lighting standard?
What defines health care occupancies?
What defines health care occupancies?
Which of the following is NOT classified as a health care occupancy?
Which of the following is NOT classified as a health care occupancy?
What characterizes ambulatory health care occupancies?
What characterizes ambulatory health care occupancies?
Which of these is a key feature of detention and correctional occupancies?
Which of these is a key feature of detention and correctional occupancies?
Residential occupancies differ from health care occupancies in that they:
Residential occupancies differ from health care occupancies in that they:
Why are individuals in ambulatory health care considered incapable of self-preservation?
Why are individuals in ambulatory health care considered incapable of self-preservation?
Which of the following facilities specifically caters to individuals in correctional settings?
Which of the following facilities specifically caters to individuals in correctional settings?
What is the maximum length of flexible appliance cord permitted for fuel-fired furnaces in residential dwellings?
What is the maximum length of flexible appliance cord permitted for fuel-fired furnaces in residential dwellings?
Which version of the National Electrical Code permits the use of flexible appliance cord on fuel-fired furnaces through December 31, 2020?
Which version of the National Electrical Code permits the use of flexible appliance cord on fuel-fired furnaces through December 31, 2020?
What is excluded from residential occupancies according to the classifications mentioned?
What is excluded from residential occupancies according to the classifications mentioned?
What type of protection must the receptacle for the appliance cord have?
What type of protection must the receptacle for the appliance cord have?
What is the requirement for boxes or conduit bodies during installation?
What is the requirement for boxes or conduit bodies during installation?
For areas separated by a fire barrier, what is true about wiring methods?
For areas separated by a fire barrier, what is true about wiring methods?
What is the definition of a fire barrier as per the provided content?
What is the definition of a fire barrier as per the provided content?
What must be obtained to use more than one extension ring on outlet boxes?
What must be obtained to use more than one extension ring on outlet boxes?
What does the 2020 edition of the National Electrical Code state regarding wiring methods in adjacent areas with fire barriers?
What does the 2020 edition of the National Electrical Code state regarding wiring methods in adjacent areas with fire barriers?
What is the minimum rating of overcurrent protection for electric vehicle charging equipment?
What is the minimum rating of overcurrent protection for electric vehicle charging equipment?
Who is responsible for labeling the adjustment device set to a value less than the maximum nameplate rating?
Who is responsible for labeling the adjustment device set to a value less than the maximum nameplate rating?
In the context of voltage drop, what does 'L' represent in the formulas provided?
In the context of voltage drop, what does 'L' represent in the formulas provided?
What is the K-factor value used as a multiplying factor for copper at 75°C?
What is the K-factor value used as a multiplying factor for copper at 75°C?
What does CMA stand for in the voltage drop formulas?
What does CMA stand for in the voltage drop formulas?
Which component's load is used to determine the maximum load of electric vehicle charging equipment?
Which component's load is used to determine the maximum load of electric vehicle charging equipment?
What is the K-factor value used as a multiplying factor for aluminum at 75°C?
What is the K-factor value used as a multiplying factor for aluminum at 75°C?
What is the formula for calculating voltage drop?
What is the formula for calculating voltage drop?
What is the required installation guideline for electrical equipment after December 31, 2020?
What is the required installation guideline for electrical equipment after December 31, 2020?
Which installation condition is prohibited for electric metallic tubing?
Which installation condition is prohibited for electric metallic tubing?
What is required for rigid nonmetallic conduits to accommodate thermal changes?
What is required for rigid nonmetallic conduits to accommodate thermal changes?
At what temperature must conditions outdoors be considered for nonmetallic conduit installations?
At what temperature must conditions outdoors be considered for nonmetallic conduit installations?
Which type of conduit must not be installed in contact with earth?
Which type of conduit must not be installed in contact with earth?
Which buildings are categorized as having severe corrosive conditions present?
Which buildings are categorized as having severe corrosive conditions present?
What specific article governs the installation of electrical panel boards and wiring devices?
What specific article governs the installation of electrical panel boards and wiring devices?
What is the effect of a vapor barrier on the requirements for electric metallic tubing?
What is the effect of a vapor barrier on the requirements for electric metallic tubing?
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Study Notes
Bonding and Grounding Requirements
- A bonding jumper is unnecessary if a separate grounding conductor is present.
- Metal outdoor lighting standards are defined as poles over twelve feet (3.66 meters) high.
- Metal lighting standards must connect to a ten-foot (3.05 meters) copperweld ground rod or twenty feet (6.10 meters) of conductive rebar, minimum diameter of one-half inch (1.27 centimeters), using a bonding jumper.
- Ground rod should be installed at the metal standard base center, extending slightly above the base.
- Both the ground rod and equipment grounding conductor must connect to the metal standards.
- Bonding jumper requirements adhere to the National Electrical Code (NEC) from 2017 until December 31, 2020, with updates in the 2020 NEC, and wire sizes must be at least no. 8 copper or no. 6 aluminum.
Grounding Electrode Conductor
- Grounding electrode conductor connects to the grounded service conductor at the service disconnect enclosure.
Wiring Methods in Agricultural Buildings
- Covers electrical installations in buildings housing livestock, poultry, and similar areas.
- All electrical setups must follow NEC article 547, with 2017 NEC provisions applicable until December 31, 2020, and 2020 NEC afterwards.
- Site-isolating devices may be installed at distribution points for multiple agricultural structures.
- Electric metallic tubing cannot be used in concrete below grade or in contact with earth.
- Aluminum conduit is prohibited from earth contact or being embedded in concrete.
- Rigid nonmetallic conduit installations must comply with NEC article 352.
Conditional Locations
- Facilities such as fertilizer rooms and meatpacking plants face corrosive conditions, demanding special wiring methods.
- Fire-rated cables are allowable in certain applications under NEC guidelines.
Outlet Boxes and Fittings Requirements
- Use of more than one extension ring on outlet boxes requires special electrical inspector permission.
- Outlet boxes or conduit bodies must be installed at every opening, splice, or connection.
Appliance Wiring Regulations
- For fuel-fired furnaces (120V, 20A or less) in residences, six feet of flexible appliance cord is allowed, with GFCI protection required for receptacles.
Electric Vehicle Charging System Specifications
- Overcurrent protection for electric vehicle charging equipment must accommodate continuous duty ratings of at least 125% of the maximum load.
Voltage Drop Calculations
- Voltage drop can be calculated using the formula: Voltage drop = (K x L x I) / CMA, with specific K factors for copper and aluminum.
- Important parameters include length (L), load in amps (I), and circular-mil area (CMA).
Occupancy Classifications
- Health care occupancies provide care for individuals incapable of self-preservation, including hospitals, nursing homes, and limited care facilities.
- Ambulatory health care facilities serve four or more outpatients simultaneously.
- Detention and correctional facilities house individuals under restraint, encompassing various types of correctional institutions.
Residential Occupancies
- Defined as accommodations for normal residential purposes, excluding health care or detention-related facilities.
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