2017 Code changes NEC

Generally, these terms were revised to eliminate Building Code provisions and to clarify that a structure is something other than equipment. Building. A structure that stands alone or that is cutoff separated from adjoining structures by fire walls with all openings therein protected by approved fire doors. 

A general term, including fittings, devices, and appliances, luminaires, apparatus, machinery, and the like used as part of, or in connection with, an electrical installation.

• …to climb over or under, to remove obstacles, or to resort portable ladders, and so forth.
• PP. 19 Analysis of Changes, NEC. 2017

• Chapters 5-7 may supplement or modify the general requirements in Chapters 1 through 7 (not just Chapters 1-4)
• PP 16. Analysis of Changes, NEC. 2017

• Chapter 8.  This is not a change.
• PP 16. Analysis of Changes, NEC. 2017

fixed Resistance and Electrode Industrial process Heating Equipment. article applies to such things as boilers, electrode boilers, duct heaters strip heaters, immersion heaters, process air heaters, or other approved [ electric equipment used for industrial process heating. Article 425.

691 Large-Scale photovoltaic (PV) Electric Power Production facility. PP 12. Analysis of Changes, NEC. 2017

Large scale PV systems connect to the grid on the metering side of the system rather than on the customer side and typically they are connected at medium voltages (4.16 kV to 34.5 kV) or higher.

Article 706 Energy Storage Systems. Added to Chapter 7 was an article addressing permanently installed energy storage systems (ESS) that may be stand-alone or interactive with other electric power production sources. ESS is defined as a device, or more than one device together: capable of storing energy for use at a future time.

Article 710 Stand-Alone systems.  This was created in 2017 to address article 705 and differentiate between interconnected, which 705 addresses, and non-interconnected, which art. 710 addresses.

A DC microgrid is defined as a power distribution system consisting of more than one interconnected dc power source, supplying dc-dc converters(s), dc loads(s), and dc loads(s) powered by dc-ac inverters.  A dc microgram is typically not directly connected to an AC primary source of electricity, but some dc rather dc-ac bidirectional converters or dc-ac inverters.

Apparatus in which the circuits are not necessarily intrinsically safe themselves but that affects the energy in the intrinsically safe circuits and is relied on to maintain intrinsic safety. Art 100, 2017

the .2 section. PP 22. Analysis of Changes, NEC. 2017

The term “Field Evaluation Body” is new in Article 100 for the 2017 NEC and is governed by NFPA 790 and 791 that covers how it should be evaluated.

• 1200 amps or more on service equipment, other than dwellings.
• All equipment in 110.16A non-dwelling unit electrical equipment that is likely to require examination, adjustment, servicing, or maintenace while energized.

No.  All equipment in 110.16A non-dwelling unit electrical equipment that is likely to require examination, adjustment, servicing, or maintenace while energized.

• It states in the 2017 NEC 110.26 that now a
• ⇨working space in lay-in ceilings will have a 22x22in access
• ⇨crawl space not less than 22x30in.
• ⇨Now instead of 600 volts, any equipment likely to be adjusted, serviced, maintained while energized, it is any under 1000 volts.
• ⇨The height of the working space will be the height necessary to install the equipment.
• This requirement regarding duct heaters was moved from ART. 424.66(B).

At all terminations, connection, and splice joints.

New to 2017 the “existing installations where a voltage system already exists and a different voltage system is being added, it shalll be permissible to mark only the new system voltage....however, the new system voltage shall be labeled OTHER UNIDENTIFIED SYSTEMS EXIST ON THE PREMISES.”

Art 210.8 NEC says now that the distance measurement is now the shortest route of the cord without piercing a wall.  And now measures from the INSIDE edge of the sink and not the outside.

NEC 625.40 now requires an individual (not separate) branch circuit for an EV charger.

• As near as practicable
• in the same area
• And the grounding conductor should be the nearest of one of the following;

load management control conductors, and also new is the supply side bonding jumper shall be permitted under an exception NEC 230.7

outdoor installations are now covered for dedicated electrical space and is new for 2017.

NEC 210.8B All 3 phase receptacles at 150V/50A and single phase 150V/100A or less, and applies to bathrooms, kitchens, rooftops, outdoors, sinks, indoor wet locations, locker rooms and service bays.

less than 7/8" from the roof for raceways and cables shall have 60F added. NEC 310.14A4d

• electrical service equipment rated 1200 amps or more and shall have a label marking for
• 1.date it was applied
• 2.clearing time,
• 3.available fault current
• 4. system voltage,

310.15B7 and added 208Y/120 volt systems, is where the 83% rule for service entrance conductors is located.

250.68C

The water pipe further than 5' from the point of entrance, and also the bolts to a column footing can be used only with a concrete encased electrode.  The column can be bonded, but is no longer considered an electrode without 10ft or more in contact with the soil.