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Article 310 provides general requirements for conductors rated up to and including 2000 volts.

#1) 310.1 Scope.

Article 310 provides general requirements for conductors rated up to and including 2000 volts.

#2) 310.1 Scope.

Insulated conductor types XHHN, XHWN, and XHWN-2 were added to 310.10.

#3) 310.10(B) Dry and Damp Locations.

Insulated conductor types XHHN, XHWN, and XHWN-2 were added to 310.10.

#4) 310.10(B) Dry and Damp Locations.

New Table 310.12.

#5) 310.12 Single-Phase Dwelling Services and Feeders.

New Table 310.12.

#6) 310.12 Single-Phase Dwelling Services and Feeders.

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

#7) 310.15(B) Ambient Temperature Correction Factors.

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

#8) 310.15(B) Ambient Temperature Correction Factors.

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

#9) 310.16 Ampacity Table.

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

#10) 310.16 Ampacity Table.

Medium Voltage cable is now covered in NEC Article 311.

#11) Article 311 Medium Voltage Conductors and Cable.

Medium Voltage cable is now covered in NEC Article 311.

#12) Article 311 Medium Voltage Conductors and Cable.

Conductors at terminals or conductors entering or leaving cabinets, cutout boxes, and meter socket enclosures shall comply with 312.6(A) through (C).

#13) 312.6 Deflection of Conductors.

Conductors at terminals or conductors entering or leaving cabinets, cutout boxes, and meter socket enclosures shall comply with 312.6(A) through (C).

#14) 312.6 Deflection of Conductors.

These current sensors were installed to monitor the performance of this panelboard. The panelboard contained 480-volt inverter output circuits from 12 different PV inverters.

#15) 312.8(B) Power Monitoring or Energy Management Equ...

These current sensors were installed to monitor the performance of this panelboard. The panelboard contained 480-volt inverter output circuits from 12 different PV inverters.

#16) 312.8(B) Power Monitoring or Energy Management Equ...

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

#17) 314.16(B)(5) Equipment Grounding Conductor Fill.

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

#18) 314.16(B)(5) Equipment Grounding Conductor Fill.

Where the raceway enclosing nonmetallic sheathed cable is complete between boxes, the cable shall not be required to be additionally secured.

#19) 314.17(B) Boxes and Conduit Bodies.

Where the raceway enclosing nonmetallic sheathed cable is complete between boxes, the cable shall not be required to be additionally secured.

#20) 314.17(B) Boxes and Conduit Bodies.

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

#21) 314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan ...

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

#22) 314.27(C) Boxes at Ceiling-Suspended (Paddle) Fan ...

These two boxes were installed facing the dead space behind the wall. After sheetrock is installed, they will not be accessible unless the building finish is removed. Oops.

#23) 314.29 Boxes, Conduit Bodies, and Handhole Enclosu...

These two boxes were installed facing the dead space behind the wall. After sheetrock is installed, they will not be accessible unless the building finish is removed. Oops.

#24) 314.29 Boxes, Conduit Bodies, and Handhole Enclosu...

Both AC and MC cable are considered supported where passing through studs spaced no more than 4 ½ foot for AC cable, and 6 foot for MC cable.

#25) 320.30(C) Supporting.

Both AC and MC cable are considered supported where passing through studs spaced no more than 4 ½ foot for AC cable, and 6 foot for MC cable.

#26) 320.30(C) Supporting.

This exterior wall will be insulated. Sometimes even an interior wall will be insulated after rough inspection to comply with sound transmission requirements.

#27) 330.80(C) Thermal Insulation.

This exterior wall will be insulated. Sometimes even an interior wall will be insulated after rough inspection to comply with sound transmission requirements.

#28) 330.80(C) Thermal Insulation.

A hazardous location rated MC cable.

#29) 330.130 Hazardous (Classified) Locations.

A hazardous location rated MC cable.

#30) 330.130 Hazardous (Classified) Locations.

A coil of cable at a box is not required by code but it might make things easier on future repair work.

#31) 334.30 Securing and Supporting.

A coil of cable at a box is not required by code but it might make things easier on future repair work.

#32) 334.30 Securing and Supporting.

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

#33) 334.104 Conductors.

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

#34) 334.104 Conductors.

Type P cable has been used for more than 40 years in harsh environments for offshore drilling operations where oil and mud are common.

#35) Article 337 Type P Cable.

Type P cable has been used for more than 40 years in harsh environments for offshore drilling operations where oil and mud are common.

#36) Article 337 Type P Cable.

Service-Entrance cable examples.

#37) 338.2 Definitions.

Service-Entrance cable examples.

#38) 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.

#39) 338.10(B)(4) Installation Methods for Branch Circu...

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.

#40) 338.10(B)(4) Installation Methods for Branch Circu...

Is the RMC conduit to the temporary construction trailer subject to “physical damage” or “severe physical damage”?

#41) 344.10(E) Severe Physical Damage.

Is the RMC conduit to the temporary construction trailer subject to “physical damage” or “severe physical damage”?

#42) 344.10(E) Severe Physical Damage.

The further the two dissimilar metals are to each other on the chart means more difference in galvanic potential. Platinum and magnesium joined together in an electrolyte would create the fastest possible galvanic corrosion. The magnesium would not last long.

#43) 344.14 Dissimilar Metals.

The further the two dissimilar metals are to each other on the chart means more difference in galvanic potential. Platinum and magnesium joined together in an electrolyte would create the fastest possible galvanic corrosion. The magnesium would not last long.

#44) 344.14 Dissimilar Metals.

Conductors inside LFMC are not permitted to operate higher than the temperature rating of the LFMC. Is this LFMC properly fastened in accordance with 350.30(A)?

#45) 350.10 Uses Permitted.

Conductors inside LFMC are not permitted to operate higher than the temperature rating of the LFMC. Is this LFMC properly fastened in accordance with 350.30(A)?

#46) 350.10 Uses Permitted.

Steel and stainless steel EMT is permitted to be in direct contact with the earth and in areas subject to <strong>physical damage</strong>. What code violations are present in this image?

#47) 358.10(E) Physical Damage.

Steel and stainless steel EMT is permitted to be in direct contact with the earth and in areas subject to <strong>physical damage</strong>. What code violations are present in this image?

#48) 358.10(E) Physical Damage.

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

#49) 366.23 Ampacity of Conductors.

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

#50) 366.23 Ampacity of Conductors.

It is quite common to see cable trays used to carry DC PV source circuits operating over 600 volts. These cable trays require the DANGER marking.

#51) 392.18(H) Marking.

It is quite common to see cable trays used to carry DC PV source circuits operating over 600 volts. These cable trays require the DANGER marking.

#52) 392.18(H) Marking.

Cable ties marked Type 2S and 21S have been evaluated for the support of cables.

#53) 392.30(B) Cables and Conductors.

Cable ties marked Type 2S and 21S have been evaluated for the support of cables.

#54) 392.30(B) Cables and Conductors.

An expansion splice plate may have slotted holes to allow for movement in the cable tray. A bonding jumper is required where cable tray systems are mechanically discontinuous.

#55) 392.44 Expansion Splice Plates.

An expansion splice plate may have slotted holes to allow for movement in the cable tray. A bonding jumper is required where cable tray systems are mechanically discontinuous.

#56) 392.44 Expansion Splice Plates.

Cables entering equipment from bushed conduit and flanged connections.

#57) 392.46 Bushed Conduit and Tubing.

Cables entering equipment from bushed conduit and flanged connections.

#58) 392.46 Bushed Conduit and Tubing.

Sections 404.9 and 404.10 now apply to control switches.

#59) 404.9 & 10 General-Use Snap Switches, Dimmers, and...

Sections 404.9 and 404.10 now apply to control switches.

#60) 404.9 & 10 General-Use Snap Switches, Dimmers, and...

Many manufacturers have been selling listed switches for years.

#61) 404.14 Rating and Use of Snap Switches.

Many manufacturers have been selling listed switches for years.

#62) 404.14 Rating and Use of Snap Switches.

Electronic control switches shall be marked by their manufacturer with their current and voltage ratings and used for loads that do not exceed their ampere rating at the voltage applied.

#63) 404.14(E) Dimmer and Electronic Control Switches.

Electronic control switches shall be marked by their manufacturer with their current and voltage ratings and used for loads that do not exceed their ampere rating at the voltage applied.

#64) 404.14(E) Dimmer and Electronic Control Switches.

Some electronic control switches are designed for other purposes besides only lighting.

#65) 404.22 Electronic Control Switches.

Some electronic control switches are designed for other purposes besides only lighting.

#66) 404.22 Electronic Control Switches.

Automatically controlled receptacles shall be replaced with equivalently controlled receptacles.

#67) 406.4(D)(7) Controlled Receptacles.

Automatically controlled receptacles shall be replaced with equivalently controlled receptacles.

#68) 406.4(D)(7) Controlled Receptacles.

Receptacles are permitted below a sink, but not face-up.

#69) 406.5(G) Receptacle Orientation.

Receptacles are permitted below a sink, but not face-up.

#70) 406.5(G) Receptacle Orientation.

Receptacles shall be installed no closer 3 feet horizontally from, and 8 feet vertically from the top of the bathtub rim or shower stall threshold.

#71) 406.9(C) Bathtub and Shower Space.

Receptacles shall be installed no closer 3 feet horizontally from, and 8 feet vertically from the top of the bathtub rim or shower stall threshold.

#72) 406.9(C) Bathtub and Shower Space.

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

#73) 406.12 Tamper-Resistant Receptacles.

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

#74) 406.12 Tamper-Resistant Receptacles.

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

#75) 406.13 Single-Pole Separable-Connector Type.

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

#76) 406.13 Single-Pole Separable-Connector Type.

The identification shall be included in a circuit directory that is located on the face, inside of, or in an approved location adjacent to the panel door.

#77) 408.4(A) Circuit Directory or Circuit Identificati...

The identification shall be included in a circuit directory that is located on the face, inside of, or in an approved location adjacent to the panel door.

#78) 408.4(A) Circuit Directory or Circuit Identificati...

Notice the available fault current marking on the service panel.

#79) 408.6 Short-Circuit Current Rating.

Notice the available fault current marking on the service panel.

#80) 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.

#81) 408.8 Reconditioning of Equipment.

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.

#82) 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.

#83) 408.18(C) Connections.

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.

#84) 408.18(C) Connections.

Panelboards are not permitted face-up.

#85) 408.43 Panelboard Orientation.

Panelboards are not permitted face-up.

#86) 408.43 Panelboard Orientation.

A properly installed luminaire retrofit kit is not considered reconditioning.

#87) 410.7 Reconditioned Equipment.

A properly installed luminaire retrofit kit is not considered reconditioning.

#88) 410.7 Reconditioned Equipment.

What type of luminaire is permitted in this zone?

#89) 410.10(D) Bathtub and Shower Areas.

What type of luminaire is permitted in this zone?

#90) 410.10(D) Bathtub and Shower Areas.

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.

#91) 410.69 Identification of Control Conductor Insulat...

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.

#92) 410.69 Identification of Control Conductor Insulat...

410.116(C) permits luminaires to be installed in or used with a luminaire enclosure that is listed for use in a fire resistance–rated construction.

#93) 410.116(C) Installation in Fire-Resistant Construc...

410.116(C) permits luminaires to be installed in or used with a luminaire enclosure that is listed for use in a fire resistance–rated construction.

#94) 410.116(C) Installation in Fire-Resistant Construc...

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

#95) 410.118 Access to Other Boxes.

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

#96) 410.118 Access to Other Boxes.

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

#97) 410 Part XVI. Special Provisions for Horticultural...

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

#98) 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.

#99) 410.176 Locations Not Permitted.

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.

#100) 410.176 Locations Not Permitted.

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

#101) 422.5 Ground-Fault Circuit-Interrupter (GFCI) Prot...

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

#102) 422.5 Ground-Fault Circuit-Interrupter (GFCI) Prot...

This is a code violation in the 2020 NEC without a bushing or grommet where the dishwasher cord passes through the cabinet.

#103) 422.16(B)(2) Built-in Dishwashers and Trash Compac...

This is a code violation in the 2020 NEC without a bushing or grommet where the dishwasher cord passes through the cabinet.

#104) 422.16(B)(2) Built-in Dishwashers and Trash Compac...

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

#105) 422.16(B)(4) Range Hoods and Microwave Oven/Range ...

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

#106) 422.16(B)(4) Range Hoods and Microwave Oven/Range ...

Even though EMT is recognized as an equipment grounding conductor in 250.118, if installed outdoors on a rooftop to serve HVAC equipment, it requires a wire type equipment grounding conductor in the raceway.

#107) 440.9 Grounding and Bonding.

Even though EMT is recognized as an equipment grounding conductor in 250.118, if installed outdoors on a rooftop to serve HVAC equipment, it requires a wire type equipment grounding conductor in the raceway.

#108) 440.9 Grounding and Bonding.

Stationary generators 600 volts and less shall be listed.

#109) 445.6 Listing.

Stationary generators 600 volts and less shall be listed.

#110) 445.6 Listing.

A summary of the code language in NEC 445.18(A), 445.18(B), 445.18(C), and 445.18(D).

#111) 445.18 Disconnecting Means and Emergency Shutdown.

A summary of the code language in NEC 445.18(A), 445.18(B), 445.18(C), and 445.18(D).

#112) 445.18 Disconnecting Means and Emergency Shutdown.

Transformers require ventilation to properly dispose of heat.

#113) 450.9 Ventilation.

Transformers require ventilation to properly dispose of heat.

#114) 450.9 Ventilation.

For one-family and two-family dwellings, a disconnecting means or its remote control for a stationary battery system shall be located at a readily accessible location outside the building for emergency use.

#115) 480.7(B) and 480.7(C) Battery System Disconnection...

For one-family and two-family dwellings, a disconnecting means or its remote control for a stationary battery system shall be located at a readily accessible location outside the building for emergency use.

#116) 480.7(B) and 480.7(C) Battery System Disconnection...

Plaques or directories shall be installed in accordance with 705.10 and 712.10.

#117) 480.7(G) Identification of Power Sources.

Plaques or directories shall be installed in accordance with 705.10 and 712.10.

#118) 480.7(G) Identification of Power Sources.

This equipment was damaged by soot (products of combustion) from a building fire several hundred feet away. Before it can be returned to service, it shall be specifically evaluated by its manufacturer or a qualified testing laboratory.

#119) 490.49 Reconditioned Switchgear.

This equipment was damaged by soot (products of combustion) from a building fire several hundred feet away. Before it can be returned to service, it shall be specifically evaluated by its manufacturer or a qualified testing laboratory.

#120) 490.49 Reconditioned Switchgear.

511.8 now applies to underground wiring below Class I locations.

#121) 511.8 Underground Wiring Below Class I Locations.

The emergency disconnect switch required by NEC 514.11(A) must be at least 20 feet away but no more than 100 feet. The emergency disconnect shall not disconnect equipment grounding conductors.

#122) 514.11(A) Emergency Electrical Disconnects.

Part II of Article 517 does not apply to Optometry.

#123) 517.10(B) Not Covered.

Tamper-resistant receptacles are not required in an infant nursery of a health care facility.

#124) 517.18(C) Designated Category 2 (General Care) Ped...

Battery systems shall be permitted to serve as the alternate source for all or part of an essential electrical system.

#125) 517.30(B)(3) Battery Systems.

When tornados, hurricanes, or other catastrophic disasters occur, a local hospital can quickly become the epicenter of care for the injured and can also become a community gathering point.

#126) 517.30(C) Location of Essential Electrical System ...

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

#127) 518.6 Illumination.

A construction office is a relocatable structure, not a mobile home.

#128) Article 545 Manufactured Buildings and Relocatable...

The requirements for floating buildings are now located in Article 555.

#129) 555.1 Scope.

A Marina Power Outlet is an enclosed assembly that can include equipment such as receptacles, circuit breakers, fused switches, fuses, a watt-hour meter(s), panelboards, and monitoring means identified for marina use.

#130) 551.2 Definitions.

Transformers and enclosures shall be identified for wet locations. The bottom of transformer enclosures shall not be located below the electrical datum plane. Is this installation code compliant?

#131) 555.7 Transformers.

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

#132) 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.

#133) 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.

#134) 600.4(D) Visibility.

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

#135) 600.6(A)(4) Disconnect. Remote Location.

Do you think these two sign retrofitters are following the installation instructions?

#136) 600.35 Retrofit Kits.

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

#137) 620.65 Signage.

#138) 625.1 Scope.

Some manufacturers have EV chargers that can be adjusted to a lower setting to accommodate limited remaining load capabilities of an electric service.

#139) 625.42 Rating.

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

#140) 625.48 Interactive Systems.

A splash pad is a fountain with a pool depth of 1 inch or less, intended for recreational use by pedestrians.

#141) 680.2 Definitions.

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

#142) 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.

#143) 680.21(C) & 680.21(D) GFCI Protection.

At least one GFCI-protected 125-volt, 15- or 20- ampere receptacle on a general-purpose circuit shall be located within a pool equipment room.

#144) 680.22(A)(5) Pool Equipment Room.

Revised code language now allows a copper grid for equipotential bonding of perimeter surfaces adjacent to a pool.

#145) 680.26(B)(2) Perimeter Surfaces.

The maximum voltage of PV system dc circuits shall be the highest voltage between any two conductors of a circuit or any conductor and ground.

#146) 690.7 Maximum Voltage.

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

#147) 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.

#148) 690.12(B)(2) Rapid Shutdown. Inside the Array Boun...

This UL Listed PV wire complies with the change in 690.31(C)(1). Be sure to use it within the array or plan on putting it in a raceway where it leaves the array.

#149) 690.31(C) Cables.

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.

#150) 690.31(D) Direct-Current Circuits on or in Buildin...

<em>Sources connected to a dc microgrid system shall be permitted where the system is capable of being isolated from all non-emergency sources.</em>

#151) 700.12(H) DC Microgrid Systems.

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

#152) 700.12(I)(2) Installation of Unit Equipment.

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

#153) 700.16 Emergency Illumination.

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

#154) 705.12 Load-Side Source Connections.

For this feeder option, an overcurrent protective device (OCPD)on the load side of the power source connection shall not be rated greater than the ampacity of the feeder.

#155) 705.12(B)(1) Feeders.

Where inverter output connections are made at feeders, all taps shall be sized based on 125% of the inverters output circuit current + the OCPD rating protecting the feeders as calculated in 240.21(B).

#156) 705.12(B)(2) Taps.

For option 1, the sum of 125% of the inverter output circuit current and the rating of the overcurrent device protecting the busbar shall not exceed the ampacity of the busbar.

#157) 705.12(B)(3) Busbars.

Paint, plaster, cleaners, abrasives, corrosive residues, or other contaminants can result in an undetermined alteration of Class 1, Class 2, Class 3, and PLTC cable properties.

#158) 725.24 Mechanical Execution of Work.

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.

#159) 725.144(B) Use of Class 2-LP or Class 3-LP Cables ...

Cables identified for future use with a tag are not considered abandoned cables.

#160) 800 Communications Systems.

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