Section 408.30869. Grounding conductors.

Section 250.118 of the code is amended to read as follows:

250.118. Types of equipment grounding conductors. The equipment grounding conductor run with or enclosing the circuit conductors shall be 1 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 busbar of any shape.

(2)     Rigid metal conduit.

(3)     Intermediate metal conduit.

(4)     Electrical metallic tubing.

(5)       Flexible metallic tubing where the tubing is terminated in listed fittings and meeting both of the following conditions:

(a)        The circuit conductors contained in the tubing are protected by overcurrent devices rated at 20 amperes or less.

(b)     The length of flexible metallic tubing in the ground return path does not exceed 1.8m (6 feet).

(6)     Armor of type AC cable as provided in section 320.108 of the code.

(7)     The copper sheath of mineral-insulated, metal-sheathed cable type MI.

(8)     Type MC cable that provides an effective ground-fault current path pursuant to 1 or more of the following:

(a)         It  contains  an  insulated  or   uninsulated  equipment   grounding  conductor  in compliance with 250.118(1).

(b)     The combined metallic sheath and uninsulated equipment grounding or bonding conductor of interlocked metal tape-type MC cable that is listed and identified as an equipment grounding conductor.

(c)      The metallic sheath or the combined metallic sheath and equipment grounding conductors of the smooth or corrugated tube-type MC cable that is listed and identified as an equipment grounding conductor.

(9)     Cable trays as permitted by sections 392.10 and 392.60of the code.

(10)     Cablebus framework as permitted by section 370.60(1) of the code.

(11)     Other listed electrically continuous metal raceways and listed auxiliary gutters.

(12)     Surface metal raceways listed for grounding.

History:  1988 AACS; 1991 AACS; 1998-2000 AACS; 2004 AACS; 2007 AACS; 2009 AACS; 2013