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Be careful to look for the shaded letter "<strong><span style="background-color: #999999;"><em>N</em></span></strong>" which identifies new code sections and chapters.

#1) NEC Style Manual.

Electric signs are not always illuminated.

#2) Article 100 Definitions. Electric sign.

Plug and play ceiling fan. Push up and twist lock it in place.

#3) Article 100 Definitions. Receptacle.

Conductors normally used to carry current shall be of copper or aluminum unless otherwise provided in this Code.

#4) 110.5 Conductors.

The new marking requirements apply when a 1200 amp or larger electric service is installed at other than dwelling units.

#5) 110.16 Arc-Flash Hazard Warning. Service Equipment...

There are many programs to determine the available fault current at a given location but most just provide the final AFC value, not the math to back it up. What would be the available fault current at the service if the service entrance conductors are only 80 feet?

#6) 110.24 Available Fault Current.

This equipment above the suspended ceiling is likely to be examined while energized and therefore requires proper working space. Are there any other issues to be concerned about in the image?

#7) 110.26(A)(4) Limited Access.

If the red dashed line measures 6 ft. or less, the receptacle will need GFCI protection.

#8) 210.8 Ground-Fault Circuit-Interrupter Protection ...

AFCI protection is now required for all 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in guest rooms and guest suites of hotels and motels.

#9) 210.12(C) AFCI Protection. Guest Rooms and Guest S...

In the 2014 NEC, the peninsula was measured from the connecting edge. In the 2017 NEC, the peninsula is measured from the wall. Each undivided peninsula requires at least 1 receptacle.

#10) 210.52(C)(3) Peninsular Countertop Spaces.

This two-car garage has two vehicle bays and requires a receptacle in each bay.

#11) 210.52(G)(1) Garages.

The pull-chain type luminaire is ok for this installation but since the switch control is not at the point of entry, there must also be a “wall switch” installed at the usual point of entry to the attic storage space.

#12) 210.70(C) Lighting Outlets Required. All Occupanci...

Questions the inspector may have: Are the parallel raceways above the transformer feeding or supplied by the exterior panelboard? If the exterior panelboard is on the secondary side of the transformer, does it have a main OCPD that provides secondary overcurrent protection for the transformer? If the exterior panelboard supplies the transformer, where is the required secondary overcurrent protection for the transformer and is it located close enough to comply with the rules in NEC 240.21(C)? Securing of the liquidtight flexible metal conduit? Are pipe bollards needed for protection?

#13) 225.27 Raceway Seal.

The High Pressure Contact (HPC) switch from GE provides an Arc Flash hazard mitigation solution for large frame fuses.

#14) 240.67 Arc Energy Reduction. Fuses.

A similar code change occurred in 250.86 for other than service raceways.

#15) 250.80 Service Raceways and Enclosures.

New footnotes (a & b) are special allowances for listed low-voltage lighting systems.

#16) Table 300.5 Minimum Cover Requirements.

Once the final ambient temperature has been determined, use NEC Table 310.15(B)(2)(a) or Table 310.15(B)(2)(b) as applicable.

#17) Table 310.15(B)(3)(c) Raceways and Cables Exposed ...

Each space separated by the barrier is calculated separately.

#18) 314.16(B) Box Fill Calculations.

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

#19) 334.3 Securing and Supporting.

Circled in red is a Type TC-ER, sunlight resistant cable that is suitable for direct burial. Circled in yellow is a new type UF cable that is specifically designed for wiring ductless mini-split HVAC units.

#20) 336.10 Uses permitted.

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.

#21) 338.10(B)(4) SE Cable. Installation Methods for Br...

Although not that commonly done, EMT is permitted for use in concrete and in direct contact with the earth.

#22) 358.10 Uses Permitted.

In the 2017 NEC, parallel conductors inside an auxiliary gutter must be grouped together to prevent current imbalance in the paralleled conductors due to inductive reactance.

#23) 366.20 Conductors Connected in Parallel.

Many ceiling mounted projectors are installed incorrectly with the flexible projector cord penetrating the ceiling tile to plug into an above grid receptacle. This recessed box is plenum rated and creates a code compliant way to plug in the projector without the flexible cord being exposed in the space above the suspended ceiling.

#24) 400.12 Uses Not Permitted.

The date of January 1, 2020 in the new exception will give switch manufacturers plenty of time to begin making occupancy sensor type switches that are equipped with a neutral.

#25) 404.2(C) Switches Controlling Lighting Loads.

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