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This room air conditioner has been installed where it is capable of being reached for operation, renewal, and inspection.

#1) Article 100 Accessible as Applied to Equipment.

New Figure 100.1 in the NEC.

#2) Article 100 Fault Current & Available Fault Curren...

“Free air” means an open or ventilated environment that allows for heat dissipation and air flow around an installed conductor. Conductors in cablebus are considered to be in free air.

#3) Article 100 Free Air (as applied to conductors).

Cables and conductors installed exposed on the surfaces of ceilings and sidewalls shall be supported by the building structure in such a manner that the cables and conductors will not be damaged by normal building use.

#4) 110.12(C) Mechanical Execution of Work. Cables and...

Examples of approved means of achieving the indicated torque values include torque tools or devices such as shear bolts or breakaway-style devices with visual indicators that demonstrate that the proper torque has been applied.

#5) 110.14(D) Terminal Connection Torque.

Reconditioned equipment shall be marked with the name, trademark, or other descriptive marking by which the organization responsible for reconditioning the electrical equipment can be identified, along with the date of the reconditioning.

#6) 110.21(A)(2) Reconditioned Equipment.

The 2020 NEC requires a disconnecting means to be marked to identify the source of supply.

#7) 110.22(A) Identification of Disconnecting Means. G...

Service equipment at other than dwelling units shall be legibly marked in the field with the available fault current.

#8) 110.24(A) Field Marking.

Electrical equipment doors, in the open position, shall not impede the entry to or egress from the working space.

#9) 110.26(C)(2) Large Equipment.

Does the hallway receptacle require GFCI protection?

#10) 210.8 Ground-Fault Circuit-Interrupter Protection ...

Which receptacles in the laundry room require GFCI protection?

#11) 210.8(A) GFCI Protection. Dwelling Units.

This 125-volt receptacle is within 6 feet of a shower stall in a nondwelling locker room and requires GFCI protection according to the 2020 NEC.

#12) 210.8(B) GFCI Protection. Other Than Dwelling Unit...

Aside from the blatant code violation of installing the outlet box hood sideways and cutting notches in the side of it, this vending machine has GFCI protection at the receptacle and in the supply cord.

#13) 210.8(D) GFCI Protection for Specific Appliances.

Section 210.63 requires a service receptacle to be located on the same level as the heating, air-conditioning, and refrigeration equipment and no further than 25 feet. This dwelling unit attic is considered a dry location.

#14) 210.8(E) Equipment Requiring Servicing.

An “<strong>Outlet</strong>”, according to the NEC Article 100 definition, is <strong><em>a point on the wiring system at which current is taken to supply utilization equipment</em></strong>.

#15) 210.8(F) GFCI Protection. Outdoor Outlets.

As long as at least one 20-amp branch circuit supplies the bathroom receptacle(s) required by 210.52(D) and any countertop and similar work surface receptacle outlets, any other installed branch circuit supplying receptacles not serving the countertop can be 15 or 20-amp rated.

#16) 210.11(C)(3) Bathroom Branch Circuits.

At least one 120-volt, 20-ampere branch circuit shall be installed to supply receptacle outlets required by 210.52(G)(1) for attached garages and in detached garages with electric power.

#17) 210.11(C)(4) Garage Branch Circuits.

AFCI protection is now required for all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in sleeping rooms of nursing homes and limited care facilities.

#18) 210.12(C) AFCI Protection in Guest Rooms, Guest Su...

Th 6-foot measurement does not include the conductors inside an enclosure, cabinet, or junction box.

#19) 210.12(D) AFCI Protection. Branch Circuit Extensio...

Installing 90°C rated power distribution blocks and a gutter at each end of a long run of branch circuit conductors just before terminating them in the panelboard or load equipment at each end can create an allowance where smaller size 90°C rated wire can be run between gutter boxes.

#20) 210.19(A)(1) Branch Circuits.

Common area branch circuits can include exterior building lighting in multi-occupancy buildings like this strip mall.

#21) 210.25(B) Common Area Branch Circuits.

The intent of the public input (code change proposal) was to find out if the receptacle in the circle can be supplied from a 15-amp branch circuit.

#22) 210.52(B)(1) Receptacle Outlets Served.

Each 12 inches of multioutlet assembly containing two or more receptacles installed in individual or continuous lengths shall be considered to be one receptacle outlet.

#23) 210.52(C) Countertops and Work Surfaces.

Review the image for a summary of the rules in 210.52(C)(2).

#24) 210.52(C)(2) Island and Peninsular Countertops and...

Garage spaces not attached to an individual dwelling unit of a multifamily dwelling shall not require a receptacle outlet in each vehicle bay.

#25) 210.52(G) Basements, Garages, and Accessory Buildi...

Section 210.63 requires a service receptacle to be located within the same room or area as the service equipment and no further than 25 feet.

#26) 210.63 Equipment Requiring Servicing.

The new requirements only require the control device to be listed, and wall-mounted near the room entrance but do not require it to be wired.

#27) 210.70(A)(1) Lighting Outlets Required. Habitable ...

Lighting outlets over interior stairways in accordance with 210.70(A)(2)(3) shall not be controlled by listed wall-mounted control devices unless they provide the full range of dimming control at each location.

#28) 210.70(A)(2) Lighting Outlets Required. Additional...

Hotels shall have at least one lighting outlet controlled by a listed wall-mounted control device installed in every habitable room and bathroom.

#29) 210.70(B) Lighting Outlets Required. Guest Rooms o...

Light control requirements for attics, underfloor spaces, utility rooms, or basements used for storage or containing equipment requiring servicing.

#30) 210.70(C) Lighting Outlets Required. All Occupanci...

A feeder with GFCI protection can satisfy the GFCI protection requirements for the branch circuit, receptacle or outlet in 210.8 and 590.6(A).

#31) 215.9 Ground-Fault Circuit-Interrupter Protection ...

Temporary feeders without ground-fault protection shall be permitted for the time period necessary but shall not exceed 90 days.

#32) 215.10 Ground-Fault Protection of Equipment.

Example of a fastened in place appliance.

#33) 220.53 Appliance Load. Dwelling Unit(s).

Type TC-ER cable installed outdoors in a wet location and exposed to sunlight.

#34) 225.10 Wiring on Buildings (or Other Structures).

Whether in a wireway or any other enclosure, power distribution blocks installed on the line side of the service equipment shall be listed and marked “suitable for use on the line side of service equipment” or equivalent.

#35) 230.46 Spliced and Tapped Conductors.

Many manufacturers make barriers to guard terminals from inadvertent contact.

#36) 230.62 Service Equipment Barriers.

Meter sockets shall be listed and rated for the voltage and current rating of the service unless supplied by and under the exclusive control of an electric utility.

#37) 230.66 Marking.

This SPD is in a subpanel downstream of the service. The SPD is not required to be in the service equipment as permitted in (B) if located at each next level distribution equipment downstream toward the load.

#38) 230.67 Surge Protection.

Three different service configurations. One is a code violation.

#39) 230.71 Maximum Number of Disconnects.

This neutral disconnect link has not yet been rotated into position or torqued in place and yet the electrician was requesting to energize from the inspector.

#40) 230.75 Disconnection of Grounded Conductor.

The 2020 NEC requires an exterior emergency disconnect for one- and two-family dwelling units.

#41) 230.85 Emergency Disconnects.

On the left, a password is required to access the device settings. On the right is a sealable cover over the breaker adjustments.

#42) 240.6 Restricted Access Adjustable-Trip Circuit Br...

On the left, a bottom fed panel (supplied by 3/0 AWG copper feeders) has a 10 AWG tap connection above the circuit breakers. The panel on the right has a tap connection at the bottom.

#43) 240.21 Feeder Taps.

For this enclosed switch, a tool is needed in order to access the overcurrent fuses inside. The actual switch must be <em>readily accessible</em>, and the fuses are code compliant even though a tool is needed to get to them.

#44) 240.24(A) Accessibility.

Aside from the installation instructions not allowing it, now NEC 240.33 does not allow enclosures for overcurrent devices to be mounted other than vertical.

#45) 240.33 Vertical Position.

Low-voltage nonrenewable fuses shall not be permitted to be reconditioned. Is there anything wrong with this picture?

#46) 240.62 Reconditioned Equipment.

GE markets the High-Pressure Contact (HPC) switches as an arc flash hazard mitigation solution.

#47) 240.67 Arc Energy Reduction.

In order to use a series combination here, since the motor is connected between the devices that are part of the series combination, the motor full load current would not be able to exceed 1% of the AIC rating of the 10k breakers.

#48) 240.86 Series Ratings and Motor Contribution.

An instantaneous trip setting must be less than the available arcing current. A documented analysis can determine the arcing current.

#49) 240.87(A) & (B) Arc Energy Reduction. Documentatio...

The arc energy reduction protection system shall be performance tested by primary current injection testing or another approved method when first installed on site.

#50) 240.87(C) Performance Testing.

Molded-case circuit breakers shall not be permitted to be reconditioned.

#51) 240.88 Reconditioned Equipment.

Article 242 is new in the 2020 NEC and was made from combining previous Article 280 <em>Surge Arresters, Over 1000 Volts,</em> and Article 285 <em>Surge-Protective Devices (SPDs), 1000 Volts or Less</em>.

#52) Article 242 Overvoltage Protection.

Many line side connections terminate in an enclosure that is not considered a service disconnect.

#53) 250.25 Grounding Systems Permitted to Be Connected...

Bare aluminum or copper-clad aluminum grounding electrode conductors without an extruded polymeric covering shall not be installed where subject to corrosive conditions or be installed in direct contact with concrete.

#54) 250.64(A) Aluminum or Copper-Clad Aluminum Conduct...

What type of PVC should be used to protect these grounding electrode conductors? Schedule 40 or schedule 80?

#55) 250.64(B) Exposed to Physical Damage.

NEC Table 250.102(C)(1).

#56) 250.104(A) Metal Water Piping.

An equipment grounding conductor passing through the box without a splice is not required to be joined inside the box to others that are spliced in the box.

#57) 250.148 Continuity of Equipment Grounding Conducto...

There are many listed transition fittings that serve as an extension of a raceway or other wiring method.

#58) 300.15(F) Fitting.

New Table 310.12.

#59) 310.12 Single-Phase Dwelling Services and Feeders.

This raceway is several inches above the rooftop therefore no temperature adder is required.

#60) 310.15(B) Ambient Temperature Correction Factors.

Ampacity Table 310.16 (formerly Table 310.15(B)(16).

#61) 310.16 Ampacity Table.

It is important to remember that equipment grounding conductors that do not leave the box (such as pigtails) are not counted.

#62) 314.16(B)(5) Equipment Grounding Conductor Fill.

A listed outlet box suitable for the sole support of ceiling-suspended (paddle) fan is one option permitted in NEC 314.27(C).

#63) 314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan ...

A hazardous location rated MC cable.

#64) 330.130 Hazardous (Classified) Locations.

NM-PCS cable incorporates Power, Control and Signal circuits.

#65) 334.104 Conductors.

Service-Entrance cable examples.

#66) 338.2 Definitions.

This 2 AWG aluminum Type SE cable has XHHW-2 (90°C) conductor insulation and is installed in an exterior wall that will be insulated after rough inspection is passed. The cable is fed from a breaker with 75°C rated terminals and supplies an apartment unit subpanel that has 75°C rated main lug terminals.

#67) 338.10(B)(4) Installation Methods for Branch Circu...

Correction factors for the number of current carrying conductors must be applied only to the conductors in cross section B.

#68) 366.23 Ampacity of Conductors.

Cables entering equipment from bushed conduit and flanged connections.

#69) 392.46 Bushed Conduit and Tubing.

There are many different types of tamper-resistant receptacles currently available.

#70) 406.12 Tamper-Resistant Receptacles.

According to 406.14(D), the use of single-pole separable connectors shall be performed by a qualified person.

#71) 406.13 Single-Pole Separable-Connector Type.

Notice the available fault current marking on the service panel.

#72) 408.6 Short-Circuit Current Rating.

Several manufacturers sell panelboard retrofit kits for replacement in existing cabinets or enclosures. They usually come with a new dead front and cover but are not meant for installations where the available fault current at the line terminals of the equipment is greater than 10,000 amps.

#73) 408.8 Reconditioning of Equipment.

This mistake was caught at the final inspection. The electrician went to great expense to provide proper work space for the rear terminals before the job was finally approved.

#74) 408.18(C) Connections.

Panelboards are not permitted face-up.

#75) 408.43 Panelboard Orientation.

A properly installed luminaire retrofit kit is not considered reconditioning.

#76) 410.7 Reconditioned Equipment.

In the years to come, ballasts and drivers will have integral lead wires that do not use a grey wire for dimming or control features.

#77) 410.69 Identification of Control Conductor Insulat...

If the box can only be accessed by removing the luminaire below it, then it’s a code violation.

#78) 410.118 Access to Other Boxes.

Horticultural lighting is becoming a popular topic with the cannabis industry.

#79) 410 Part XVI. Special Provisions for Horticultural...

Lighting equipment identified for horticultural use shall not be installed as lighting for general illumination unless such use is indicated in the manufacturer’s instructions.

#80) 410.176 Locations Not Permitted.

Section 422.5 requires Class A GFCI protection for many types of appliances.

#81) 422.5 Ground-Fault Circuit-Interrupter (GFCI) Prot...

Microwave/range hood combination units are permitted to be cord-and-plug-connected.

#82) 422.16(B)(4) Range Hoods and Microwave Oven/Range ...

Part II of Article 517 does not apply to Optometry.

#83) 517.10(B) Not Covered.

Illumination is required for all working spaces about fixed service equipment, switchboards, switchgear, panelboards, or motor control centers installed outdoors that serve assembly occupancies.

#84) 518.6 Illumination.

Several items need to align to use the new exception in 590.4(G) and go without a cover plate.

#85) 590.4(G) Splices.

This temporary construction power will be subjected to harsh conditions before the job is over, then it will be moved to the next job site.

#86) 590.8 Overcurrent Protective Devices.

With the help of a little gravity, the listing labels on this sign should be visible pretty soon after this sign hits the ground.

#87) 600.4(D) Visibility.

First responders need to be able to easily find the sign disconnect.

#88) 600.6(A)(4) Disconnect. Remote Location.

Equipment enclosures containing selectively coordinated overcurrent devices shall be legibly marked in the field to indicate that the overcurrent devices are selectively coordinated.

#89) 620.65 Signage.

#90) 625.1 Scope.

An interactive system may incorporate a power export function allowing the EV to supply power to external loads on the premises.

#91) 625.48 Interactive Systems.

Aging swimming pool equipment can create a safety hazard if not properly maintained.

#92) 680.4 Inspections After Installation.

Where a pool pump motor in 680.21(C) is replaced for maintenance or repair, the replacement pump motor shall be provided with ground-fault circuit-interrupter protection.

#93) 680.21(C) & 680.21(D) GFCI Protection.

Electronic devices such as diodes are now permitted to satisfy the requirements in 690.9(B).

#94) 690.9(B) Device Ratings.

Rapid shutdown is critical to ensure that live DC conductors are reduced to a low enough voltage level that a firefighter cutting into a roof and contacting a PV system circuit is not exposed to a substantial shock hazard.

#95) 690.12(B)(2) Rapid Shutdown. Inside the Array Boun...

Where inside buildings, PV system dc circuits that exceed 30 volts or 8 amperes shall be contained in metal raceways, in Type MC metal-clad cable that complies with 250.118(10), or in metal enclosures.

#96) 690.31(D) Direct-Current Circuits on or in Buildin...

700.12(I)(2)(3)(b) was used for this example.

#97) 700.12(I)(2) Installation of Unit Equipment.

LED emergency light above an exit door. Is it compliant with 700.16(B)?

#98) 700.16 Emergency Illumination.

Not enough room in the panelboard to add another breaker might create the need for tapping the feeder directly.

#99) 705.12 Load-Side Source Connections.

Power Over Ethernet (POE) is an increasingly popular way to take a data cable such as a Cat 5 or Cat 6 cable and use it to power LED lighting or other low energy consuming equipment that can operate at limited voltage levels.

#100) 725.144(B) Use of Class 2-LP or Class 3-LP Cables ...

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