NCTCOG Electrical Advisory Board 2017 National Electrical Code

NCTCOG Electrical Advisory Board 2017 National Electrical Code Amendments Chapter 5 & 6 review 1

Recommended Amendments to the 2017 NEC • • Standard type is text from the NEC. Highlighted with gray shading is text inserted. Lined through type is deleted text from NEC. A double asterisk (**) at the beginning of an article identifies an amendment carried over from the 2014 • A triple asterisk (***) identifies a new or revised amendment with the 2017 code. 2

**Article 500. 8 (A)(3) • 500. 8 Equipment. Articles 500 through 504 require equipment construction and installation that ensure safe performance under conditions of proper use and maintenance. – Informational Note No. 1: It is important that inspection authorities and users exercise more than ordinary care with regard to installation and maintenance. – Informational Note No. 2: Since there is no consistent relationship between explosion properties and ignition temperature, the two are independent requirements. 3

**Article 500. 8 (A)(3) cont. – Informational Note No. 3: Low ambient conditions require special consideration. Explosionproof or dustignitionproof equipment may not be suitable for use at temperatures lower than -25°C (-13°F) unless they are identified for low-temperature service. However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified as Class I, Division 1 at normal ambient temperature. 4

**Article 500. 8 (A)(3) changed to read as follows: • 500. 8 Equipment. – (A) Suitability of identified equipment shall be determined by one of the following: – (1) Equipment listing or labeling – (2) Evidence of equipment evaluation from a qualified testing laboratory or inspection agency concerned with product evaluation – (3) Evidence acceptable to the authority having jurisdiction such as a manufacturer's self evaluation or an owner's engineering judgment. an engineering judgment signed and sealed by a qualified Registered licensed Professional Engineer in the State of Texas. 5

**Article 500. 8 (A)(3) cont. • Informational Note: Additional documentation for equipment may include certificates demonstrating compliance with applicable equipment standards, indicating special conditions of use, and other pertinent information. • (REASON FOR CHANGE: Carry over from previous amendment with change to better define the qualifications for an engineering judgment. ) – No Code change this cycle. – Amendment is still applicable? – Amendment should carry forward? 6

**Article 505. 7 (A) • 505. 7 Special Precaution. Article 505 requires equipment construction and installation that ensures safe performance under conditions of proper use and maintenance. – Informational Note No. 1: It is important that inspection authorities and users exercise more than ordinary care with regard to the installation and maintenance of electrical equipment in hazardous (classified) locations. – Informational Note No. 2: Low ambient conditions require special consideration. Electrical equipment depending on the protection techniques described by 505. 8(A) may not be suitable for use at temperatures lower than -20°C (-4°F) unless they are identified for use at lower temperatures. However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified Class I, Zones 0, 1, or 2 at normal ambient temperature. 7

**Article 505. 7 (A) changed to read as follows: • (A) Implementation of Zone Classification System. Classification of areas, engineering and design, selection of equipment and wiring methods, installation, and inspection shall be performed by a qualified persons Registered licensed Professional Engineer in the State of Texas. • (REASON FOR CHANGE: Carry over from previous amendment with change to better define the qualifications for an engineering judgment. ) – No Code change this cycle. – Amendment is still applicable? – Amendment should carry forward? 8

***Article 517. 30 Requirements for the Essential Electrical System; create a new (H) and add the following language: • (G) Coordination. Overcurrent protective devices serving the equipment branch of the essential electrical system shall be coordinated for the period of time that a fault’s duration extends beyond 0. 1 second. 9

**Article 517. 31 continued • Exception No. 1: Between transformer primary and secondary overcurrent protective devices, where only one overcurrent protective device or set of overcurrent protective devices exists on the transformer secondary. • Exception No. 2: Between overcurrent protective devices of the same size (ampere rating) in series. • Informational Note: The terms coordination and coordinated as used in this section do not cover the full range of overcurrent conditions. 10

**Article 517. 31 continued • (H) Selective Coordination. Overcurrent protective devices serving the life safety, and critical branches of the essential electrical system shall be selectively coordinated with all supply-side overcurrent protective devices. • Exception No. 1: Between transformer primary and secondary overcurrent protective devices, where only one overcurrent protective device or set of overcurrent protective devices exists on the transformer secondary. 11

**Article 517. 31 continued • Exception No. 2: Between overcurrent protective devices of the same size (ampere rating) in series. • Informational Note: The terms coordination and coordinated as used in this section do not cover the full range of overcurrent conditions. 12

***Article 517. 31 continued • (REASON FOR CHANGE: Changes made by deleting the definition of emergency systems in Article 517 Health Care Facilities and removing emergency systems as “Essential Electrical Systems for Hospitals in 517. 30(B)(2), plus the new addition of section 517. 30(G) for “Coordination” instead of using selective coordination, has diminished the reliability of the “Life Safety and Critical Branches of the Essential Electrical System” to deliver power to vital loads. By providing only “coordination, ” the instantaneous portion of the timecurrent curve has been eliminated from the overcurrent device settings. ) – No Code language change this cycle. – Amendment is still applicable? Yes. – Amendment should carry forward? Yes. 13

***Article 517. 301 Requirements for the Essential Electrical System; create a new (H) and add the following language: • ***Article 517. 301 is the new article heading due to being renumbered this Code cycle. 14

***Article 517. 301 continued • (REASON FOR CHANGE: Carry over from previous amendments. Changes made by deleting the continued deletion of the definition of emergency systems in Article 517 Health Care Facilities and removing emergency systems as “Essential Electrical Systems for Hospitals in 517. 30(B)(2), (2014 Code), plus the new addition of section 517. 301(G) for “Coordination” instead of using selective coordination, has diminished the reliability of the “Life Safety and Critical Branches of the Essential Electrical System” to deliver power to vital loads. By providing only “coordination, ” the instantaneous portion of the time-current curve has been eliminated from the overcurrent device settings. ) 15

Article 600. 6(A)(1) 2014 revisions 16

Article 600. 6(A)(1) 2014 revisions continued 17

Article 600. 6(A)(1) 2014 revisions continued 18

Article 600. 6(A)(1) 2014 revisions continued 19

Article 600. 6(A)(1) 2014 revisions continued 20

Article 600. 6(A)(1) 2014 revisions continued 21

Article 600. 6(A)(1) 2014 revisions continued 22

Article 600. 6(A)(1) 2014 revisions continued • Detached signs have been included in the definition of structures in most jurisdictions • Attached signs share similar wiring methods as detached signs • Are attached signs therefore included in the same requirements for disconnecting means? • Yes! 23

Article 600. 6(A)(1) cont. • Typical construction of a fluorescent attached or detached sign cabinet. All wiring is required to be enclosed because of Plexiglas faces 24

Article 600. 6(A)(1) cont. 25

Article 600. 6(A)(1) cont. 26

Article 600. 6(A)(1) cont. 27

Article 600. 6(A)(1) cont. 28

Article 600. 6(A)(1) cont. 29

Article 600. 6(A)(1) cont. 30

Article 600. 6(A)(1) 2017 revisions Language has been revised to clarify ungrounded conductors are to be disconnected and not all wiring. 31

Article 600. 6(A)(1) 2017 revisions 32

***Article 600. 6(A)(1) At Point of Entry to a Sign; create a new Exception No. 3 and add the following language: • Exception No. 3: A disconnect shall not be required at the point of entry to a sign or sign enclosure for branch circuit(s) or feeder conductor(s) passing through the sign where enclosed in a Chapter 3 listed raceway or metal-jacketed cable identified for the location. The conductors shall be routed to a device box which contains the sign disconnect. A field-applied permanent warning label that is visible during servicing shall be applied to the raceway at or near the point of entry into the sign enclosure or sign body. The warning label shall comply with 110. 21(B) and state the following: “Danger. This raceway contains energized conductors. ” The marking shall include the location of the disconnecting means for the energized conductor(s). The disconnecting means shall be capable of being locked in the open position in 33 accordance with 110. 25.

***Article 600. 6(A)(1) continued • (REASON FOR CHANGE: Changes made by requiring a disconnect at the point of entry for conductors to a sign has created confusion for compliance. It has required changing the process of manufacturing signs that had kept up with new methods and materials. The intention of having local control of the sign for service personnel has not been served by the conflicting language in this article. There are 3 exceptions for compliance, with one for conductors in a Chapter 3 raceway but the interpretation has been that they are routed to a panelboard in a sign. The majority of signs do not fall in this category as they are self-contained individual letters or self-contained cabinets. ) – Confusion requires an exception for clarification? – Amendment is applicable? – Amendment should be proposed? 34

***Article 680. 25(A) changed to read as follows: • 680. 25 Feeders. • These provisions shall apply to any feeder on the supply side of panelboards supplying branch circuits for pool equipment covered in Part II of this article and on the load side of the service equipment or the source of a separately derived system. • (A) Wiring Methods. • (1) Feeders shall be installed in rigid metal conduit, intermediate metal conduit. The following wiring methods shall be permitted if not subject to physical damage: 35

***Article 680. 25(A) cont. • • • (1) Liquidtight flexible nonmetallic conduit (2) Rigid polyvinyl chloride conduit (3) Reinforced thermosetting resin conduit (4) Electrical metallic tubing where installed on or in a building (5) Electrical nonmetallic tubing where installed within a building (6) Type MC Cable where installed within a building and if not subject to corrosive environment • (7) Nonmetallic-sheathed cable • (8) Type SE cable 36

***Article 680. 25(A) cont. • Exception: A feeder within a one-family dwelling or two-family dwelling unit between remote panelboard and service equipment shall be permitted to run in flexible metal conduit or an approved cable assembly that includes an insulated equipment grounding conductor within its outer sheath. The equipment grounding conductor shall comply with 250. 24(A) (5). • (REASON FOR CHANGE: Carry over from previous amendments. Text changed to reflect 2014 National Electrical Code. Exception deleted per Errata No. 70 -14 -2) • 2011 COG Amendments, first appearance • (REASON FOR CHANGE: To allow for more flexibility of wiring methods associated with this type of installation. ) 37

Article 680. 25(A) 2017 revision • First Draft Revision rewrote article in consideration of harsh environments and wiring methods required • Second Draft Revision continued with revised language • New language referenced new article 680. 14 for corrosive environments requiring specific wiring methods • New language referenced noncorrosive environments could use any Chapter 3 wiring method allowed 38

Article 680. 25(A) 2017 revisions cont. 39

Article 680. 25(A) 2017 revisions cont. 40

Article 680. 25 cont. 41

Article 680. 14 2017 revisions 42

Article 680. 14 2017 revisions • Committee Statement: The topic of suitability to physical damage should be separate text. The reference to specific wiring methods should be deleted from the article. Wiring methods that have been specifically evaluated for the type of corrosive environment around swimming pool pumps and sanitation chemicals are not yet readily available. A new section 680. 14 should be created to detail the corrosion resistance necessary of wiring methods needed in swimming pool installations. 43

***Article 680. 25(A) changed to read as follows: • Article 680. 14 is for indoor areas? Code indicates, yes. • Limited outdoor areas where vapors may be present? May apply if vapors present without dissipation or spills. • Any amendment necessary? • Should not affect legacy wiring methods allowed in other areas? – Amendment is still applicable? – Amendment should carry forward? – Language included referencing 680. 14 wiring methods? 44

***Article 680. 25(A) changed to read as follows: • 680. 25 Feeders. • These provisions shall apply to any feeder on the supply side of panelboards supplying branch circuits for pool equipment covered in Part II of this article and on the load side of the service equipment or the source of a separately derived system. • (A) Feeders. Where feeders are installed in corrosive environments as described in 680. 14, the wring method of that portion of the feeder shall be as required in 680. 14(B) or shall be liquidtight flexible nonmetallic conduit. Wiring methods installed in corrosive environments as described in 680. 14 shall contain an insulated copper equipment grounding conductor sized in accordance with Table 250. 122, but not smaller than 12 AWG. • Where installed in noncorrosive environments, feeders shall comply with the general requirements in Chapter 3. 45

***Article 680. 25(A) changed to read as follows: cont. • The following wiring methods shall be permitted if not subject to physical damage: • (1) Liquidtight flexible nonmetallic conduit • (2) Rigid polyvinyl chloride conduit • (3) Reinforced thermosetting resin conduit • (4) Electrical metallic tubing where installed on or in a building • (5) Electrical nonmetallic tubing where installed within a building • (6) Type MC Cable where installed within a building and if not subject to corrosive environment • (7) Nonmetallic-sheathed cable • (8) Type SE cable 46

***Article 680. 25(A) changed to read as follows: cont. – (REASON FOR CHANGE: Carry over from previous amendments. Text changed to reflect 2017 National Electrical Code. ) – Amendment is applicable? Yes. – Amendment should carry forward as written? 47

NCTCOG Electrical Advisory Board Questions? 48