Tennessee Electrical Inspector License and Exam Prep

The 2021 IRC® contains many important changes such as:

• Braced wall lines must be placed on a physical wall or placed between multiple walls.
• The rated separation for two-family dwellings is 1 hour whether or not a lot line exists between units.
• Emergency escape and rescue openings require a clear 36-inch-wide path to a public way.
• An engineered design is required for storm shelters.
• A habitable attic is limited to one-half the area of the story below and the dwelling requires sprinklers.
• Updated Wind Speed maps match IBC and ASCE 7 maps.
• Deck design now considers snow load, tributary area for footing and post height, and guard details.
• Specific requirements for deck guardrails were added.
• Component and cladding wind pressures in Table R301.2(2) are updated for new design wind speeds and hip or gable roof profiles.
• Minimum footing size tables are revised to more accurately reflect current practice.
• Cripple wall requirements apply only to exterior cripple walls.
• New appendices for cob construction and 3D printed construction are added.
• A 30 percent reduction of airflow is permitted for balanced ventilation systems.
• Commercial gas cooking appliances are prohibited.
• The head pressure for a water test of DWV systems increased to 10 feet.
• Air vacuum testing is now permitted for plastic piping DWV systems.
• Section P2904 for dwelling sprinklers is expanded to more closely align with NFPA 13D.
• An emergency service disconnect is required in a readily accessible outdoor location.
• A surge-protective device (SPD) is now required at the service panel.
• The number of receptacle outlets required for peninsular and island countertops in kitchens is determined by the area of the countertop surface.
• GFCI protection is now required for damp and wet locations not included in the other 10 areas requiring GFCI protection.

Prepare for the electrical challenges of tomorrow, today, with NFPA 70, National Electrical Code (NEC), 2020 edition.

The world never stops changing, so it's crucial to keep learning how to keep it safe. Incorporated by reference in all 50 states and used across the globe, NFPA 70®, National Electrical Code® (NEC®), is the benchmark standard for electrical safety in residential, commercial, and industrial settings.

NFPA 70, NEC, was first published in 1897 and is continually put through a rigorous review process to keep it up to date with the most current industry practices, emerging trends, and the development and introduction of new technologies. The new NEC provides the latest requirements for safer and more effective electrical design, installation, and inspection, including provisions for wiring, overcurrent protection, grounding, and equipment.

Get up-to-code and prepared for the safety challenges of new sources of electrical power with the NEC, 2020 edition.

The revised and expanded NFPA 70, National Electrical Code, features state-of-the-art information for safe electrical practices for public and private buildings, homes and structures, outdoor yards and lots, utility equipment, installations that connect to the power grid, and consumer-owned power generation systems and equipment.

Content has been added, edited, and reorganized to address safety for workers, energy systems and electric vehicles, limited energy, and communication systems.

Impactful changes include:

• New requirements for exterior emergency disconnects of one- and two-family dwellings for improved electrical safety for emergency responders
• Revisions to service disconnect rules to help protect electrical workers from arc flash hazards
• Adapted and adjusted requirements for installation practices of new technologies to meet the evolving demand of power over Ethernet
• Updates to modernize tables currently in use for calculations to reflect improvements in energy efficiency and align with evolving codes
• Revised requirements for ground-fault protection within marinas and boatyards
• Introduction of guidelines for the safe use of electric vehicles (electric vehicle power export equipment) as a backup or emergency power source for a building or a home
• Reorganization of Article 310, including new user-friendly numbering for important ampacity tables, and new definition for cable bundle in Article 725
• Relocation of surge protection device requirements to new Article 242
• Revisions to alternative energy systems and electric vehicle requirements to clarify what portions of the PV system are covered by the requirements of Article 690 and the line side and load side connections of interconnected power supply sources, and to clearly distinguish energy storage systems from storage battery systems
• Reorganization of Article 800 to provide a general set of requirements to apply throughout the Chapter 8 articles
• Revisions to requirements for communications cables that are also carrying power to communication devices and revisions to the current limit for cables carrying power and data

The NEC, 2020 edition, introduces significant new requirements for:

• The residential installation of receptacle outlets serving island and peninsular countertops and for surge protection of services supplying dwelling units
• Working space for “housekeeping pads” for electrical equipment, the installation of wiring methods in exit enclosures, sizing supply and load conductors used with adjustable-speed drive systems, and AFCI protection of branch circuits in patient sleeping areas in care facilities
• Calculating the load of electric vehicle supply equipment with variable current settings
• Worker safety in identifying the source of power for disconnecting means and for egress from spaces containing large electrical equipment
• Grounding of disconnecting means installed on the supply-side of service disconnecting means
• Cables installed exposed on ceiling surfaces and sidewalls
• Special occupancies, special equipment, and special conditions, including installation of splash pads, the use of “Type P” cables in hazardous classified locations, and the reinspection of swimming pools and other bodies of water

Help protect life and property with the most relevant electrical requirements.

Get the cutting edge information you need to identify and overcome the latest hazards and complexities in electrical work. Order your copy of NFPA 70®, National Electrical Code, 2020 edition, today.

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