I.A.E.I. International Association of Electrical Inspectors

1. I.A.E.I. � International Association of Electrical Inspectors Resource for electrical code issues Meets the 1st Monday of the month at the Con Edison Building, 4 Irving Place, NYC Representatives include: NYC Buildings Dept., Underwriters Laboratory & Electrical Industry (212) 460-6784

2. NEC 2008 Definitions Grounding Electrode Conductor. A conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system. Table 250.66. Grounding Conductor, Equipment (EGC). The conductive path installed to connect normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both. Table 250.122. Grounded Conductor. A system or circuit conductor that is intentionally grounded. (Neutral Conductor) Ungrounded Conductor. Not connected to ground or to a conductive body that extends the ground connection. (Phase Conductor) Bonded. The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed. Grounded. Connected to earth or to some conducting body that serves in place of the earth.

3. 250.118. Types of Equipment Grounding Conductors The equipment grounding conductor run with or enclosing the circuit conductors shall be one or more or a combination of the following: � 1. A copper, aluminum, or copper-clad aluminum conductor. This conductor shall be solid or stranded; insulated, covered, or bare; and in the form of a wire or a bus bar of any shape. 2. Rigid metal conduit. 3. Intermediate metal conduit. 4. Electrical metallic tubing. 5. Flexible metal conduit where both the conduit and fittings are listed for grounding. 6. Listed flexible metal conduit that is not listed for grounding, meeting all the following conditions: a. The conduit is terminated in fittings listed for grounding. b. The circuit conductors contained in the conduit are protected by over current devices rated at 20 amperes or less. c. The combined length of flexible metal conduit and flexible metallic tubing and liquid tight flexible metal conduit in the same ground return path does not exceed 1.8m (6ft). d. The conduit is not installed for flexibility.

4. 250.118. Types of Equipment Grounding Conductors Continued 7. Listed liquid tight flexible metal conduit meeting all the following conduits: a. The conduit is terminated in fittings listed for grounding. b. For metric designators 12 through 16 (trade sizes 3/8 through 1/2), the circuit conductors contained in the conduit are protected by over current devices rated at 20 amperes or less. c. For metric designators 21 through 35 (trade sizes � through 1 �), the circuit conductors contained in the conduit are protected by over current devices rated not more than 60 amperes and there is not flexible metal conduit, flexible metallic tubing, or liquid tight flexible metal conduit in trade sizes metric designators 12 through 16 (trade sizes 3/8 through 1/2) in the grounding path. d. The combined length of flexible metal conduit and flexible metallic tubing and liquid tight flexible metal conduit in the same ground return path does not exceed 1.8m (6ft). e. The conduit is not installed for flexibility.

5. 250.118. Types of Equipment Grounding Conductors Continued 8. Flexible metallic tubing where the tubing is terminated in fittings listed for grounding and meeting the following conditions: a. The circuit conductors contained in the tubing are protected by over current devices rated at 20 amperes or less. b. The combined length of flexible metal conduit and flexible metallic tubing and liquid tight flexible metal conduit in the same ground return patch does not exceed 1.8m (6ft). 9. Armor type AC cable as provided in 320.108. 10. The copper sheath of mineral-insulated, metal-sheathed cable. 11. Type MC cable where listed and identified for grounding in accordance with the following: a. The combined metallic sheath and grounding conductor of interlocked metal tape-type MC cable. b. The metallic sheath or the combined metallic sheath and grounding conductors of the smooth or corrugated tube type MC cable. 12. Cable trays as permitted in 392.3 (C) and 392.7. 13. Cable bus framework as permitted in 370.3. 14. Other electrically continuous metal raceways and auxiliary gutters listed for grounding.

6. 250.119 Identification of Equipment Grounding Conductors Unless required elsewhere in this Code, equipment grounding conductors shall be permitted to be bare, covered, or insulated. Individually covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green or green with one or more yellow stripes except as permitted in this section. Conductors with insulation or individual covering that is green, green with one or more yellow stripes, or otherwise identified as permitted by this section shall not be used for ungrounded or grounded circuit conductors. (A) Conductors larger than 6 AWG equipment grounding conductors larger than 6 AWG shall comply with 250.119(A)(1) and (A)(2). (1) An insulated or covered conductor larger than 6 AWG shall be permitted, at the time of installation, to be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible. Exception: Conductors larger than 6 AWG shall not be required to be marked in conduit bodies that contain no splices or usual hubs.� (2) Identification shall encircle the conductor and shall be accomplished by one of the following: a. Stripping the insulation or covering from the entire exposed length. b. Coloring the exposed insulation or covering green. c. Marking the exposed insulation or covering with green tape or green adhesive labels.