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AC systems supplying fixed and portable electric equipment within the cell line working zone; and
Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone.

Related Code Sections

1910.304(g)(6) Electrical, Supports, Enclosures, and Equipment to Be Grounded
for conductors added to existing installations of open wire, knob-and-tube wiring, and nonmetallic-sheathed cable need not be grounded if all of the following ...