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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...

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.

#5) 110.21(A)(2) Reconditioned Equipment.

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

#6) 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.

#7) 110.24(A) Field Marking.

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

#8) 110.26(C)(2) Large Equipment.

Does the hallway receptacle require GFCI protection?

#9) 210.8 Ground-Fault Circuit-Interrupter Protection ...

Which receptacles in the laundry room require GFCI protection?

#10) 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.

#11) 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.

#12) 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.

#13) 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>.

#14) 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.

#15) 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.

#16) 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.

#17) 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.

#18) 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.

#19) 210.19(A)(1) 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.

#20) 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.

#21) 210.52(C) Countertops and Work Surfaces.

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

#22) 210.52(C)(2) Island and Peninsular Countertops and...

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.

#23) 210.63 Equipment Requiring Servicing.

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

#24) 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).

#25) 215.9 Ground-Fault Circuit-Interrupter Protection ...

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

#26) 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.

#27) 230.46 Spliced and Tapped Conductors.

Many manufacturers make barriers to guard terminals from inadvertent contact.

#28) 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.

#29) 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.

#30) 230.67 Surge Protection.

Three different service configurations. One is a code violation.

#31) 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.

#32) 230.75 Disconnection of Grounded Conductor.

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

#33) 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.

#34) 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.

#35) 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.

#36) 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.

#37) 240.33 Vertical Position.

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

#38) 240.62 Reconditioned Equipment.

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

#39) 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.

#40) 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.

#41) 240.87(A) & (B) Arc Energy Reduction. Documentatio...

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

#42) 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.

#43) 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?

#44) 250.64(B) Exposed to Physical Damage.

NEC Table 250.102(C)(1).

#45) 250.104(A) Metal Water Piping.

New Table 310.12.

#46) 310.12 Single-Phase Dwelling Services and Feeders.

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

#47) 310.15(B) Ambient Temperature Correction Factors.

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

#48) 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.

#49) 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).

#50) 314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan ...

A hazardous location rated MC cable.

#51) 330.130 Hazardous (Classified) Locations.

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

#52) 334.104 Conductors.

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.

#53) 338.10(B)(4) Installation Methods for Branch Circu...

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

#54) 406.12 Tamper-Resistant Receptacles.

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

#55) 406.13 Single-Pole Separable-Connector Type.

Notice the available fault current marking on the service panel.

#56) 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.

#57) 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.

#58) 408.18(C) Connections.

Panelboards are not permitted face-up.

#59) 408.43 Panelboard Orientation.

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.

#60) 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.

#61) 410.118 Access to Other Boxes.

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

#62) 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.

#63) 410.176 Locations Not Permitted.

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

#64) 422.5 Ground-Fault Circuit-Interrupter (GFCI) Prot...

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

#65) 518.6 Illumination.

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

#66) 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.

#67) 590.8 Overcurrent Protective Devices.

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

#68) 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.

#69) 680.21(C) & 680.21(D) GFCI Protection.

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.

#70) 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.

#71) 690.31(D) Direct-Current Circuits on or in Buildin...

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

#72) 700.12(I)(2) Installation of Unit Equipment.

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

#73) 700.16 Emergency Illumination.

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

#74) 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.

#75) 725.144(B) Use of Class 2-LP or Class 3-LP Cables ...

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