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1910.306(h)(5)(i)(A)
AC systems supplying fixed and portable electric equipment within the cell line working zone; and
1910.306(h)(5)(i)(B)
Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone.

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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 ...