CHAPTER 4-11
NATIONAL ELECTRICAL CODE
Sections:
4-11-001-0001 AMENDMENTS, ADDITIONS, AND DELETIONS
4-11-001-0001 AMENDMENTS, ADDITIONS, AND DELETIONS
The following provisions shall have the effect of either amending, adding to, or deleting from the National Electrical Code (NEC), 2017 Edition, adopted in Flagstaff City Code, Title 4, Building Regulations, Chapter 4-01, Administrative Enactments, Section 4-01-001-0002, Adoption of Model Codes.
CHAPTER 1, GENERAL
Article 110, Requirements for Electrical Installations, Part I, General
Amend 2017 NEC Article 110.5, Conductors, to read:
Conductors used to carry current shall be of copper only. Where the conductor material is not specified, the material and the sizes given in this Code shall apply to copper conductors. The use of aluminum wire shall be approved for feeders and service entrance conductors only and shall not be used for branch circuit wiring.
Amend 2017 NEC Article 110.7, Wiring integrity, by adding:
All equipment rated at 1000 amperes or more shall be tested for insulation breakdown, mechanical integrity, and workmanship prior to the equipment being energized. A certified high potential voltage test (hi-pot) shall be performed and a certificate issued to the Building Official. This test shall be performed in the presence of a Building Inspector and conducted by a testing firm approved by the Building Official.
Said test shall be performed for a period of one (1) minute, the application of a 60 hertz alternating potential of 1000 volts plus twice the rated phase to phase voltage of the equipment.
This test shall be performed between all phases to ground, phase to phase, and neutral if isolated.
CHAPTER 2, WIRING AND PROTECTION
Article 210, Branch Circuits, Part I, General Provisions
Amend 2017 NEC Article 210.5, Identification for Branch Circuits, by adding:
(D) Color Code. Where 15, 20, or 30 ampere branch circuits requiring a neutral are installed in raceways or cable assemblies, the conductor of branch circuits connected to the same system shall conform to the following color code:
|
Volts |
Phase |
System |
Phase A |
Phase B |
Phase C |
Neutral |
|---|---|---|---|---|---|---|
|
120/208 |
3 |
Wye |
Black |
Red |
Blue |
White |
|
120/240 |
3 |
Delta |
Black |
Orange |
Blue |
White |
|
277/480 |
3 |
Wye |
Brown |
Orange |
Yellow |
Gray |
Article 250, Grounding and Bonding, Part II, System Grounding
Amend 2017 NEC Article 250.30, Grounding Separately Derived Alternating-Current Systems, (A) Grounded Systems, (2) Supply-Side Bonding Jumper, by adding:
(c) All new building construction shall have a one-piece concrete-encased electrode and electrode conductor (Ufer ground), a minimum twenty (20) feet length in the footing, sized from the following table:
0-200 ampere service: 1 piece #4 copper (electrode and electrode conductor)
201-400 ampere service: 1 piece 1/0 copper (electrode and electrode conductor)
401-800 ampere service: 1 piece 2/0 copper (electrode and electrode conductor)
Larger than 800 ampere service: 1 piece 3/0 copper (electrode and electrode conductor)
Where the Ufer has been lost, damaged, or cannot be located, a ground ring or modification of the same consisting of thirty (30) feet of #2 bare copper wire, buried a minimum of thirty (30) inches deep in a trench, or a plate electrode per Article 250.53 (H) shall be required in lieu of a concreteencased electrode.
(Ord. 2019-16, Amended, 06/18/2019)