1. Suppose you have a 480V-208Y/120V transformer mounted on building steel 20 ft from the column-width panel (with main) it supplies. The panel sits in the webbing of a vertical I beam, and the supply feeder runs in rigid nonmetallic conduit. The Xo terminal and the transformer enclosure are bonded. Where could you bring the grounding electrode conductor?

a. The transformer

b. The panel

c. The panel if it has an insulated neutral bar

d. More than one of the above

2. Suppose you install a 13.8kV-480Y/277V transformer and secondary panel with a main disconnect on the top floor of a 5-story office building. Assume no effectively grounded building steel, but there’s an adjacent 2-in. copper water line running exposed through utility closets and firestopped floors to its basement entrance. Where could you connect the grounding electrode conductor? The building owner pays for janitorial service, but provides no other ongoing oversight.

a. The basement water entrance

d. More than one of the above

3. Your neighbor decides to build a detached wood-frame workshop on reinforced concrete footings. There isn’t much load, so you go out with a 60A 120/240V feeder from his basement panel. How many wires (minimum) do you need to pull into the feeder raceway?

a. RNC=4/GRC=3

b. RNC=4/GRC=4

c. RNC=3/GRC=3

d. RNC=3/GRC=4

4. In the prior question, if you plan to use the reinforcing as the electrode, what do you need to do before the concrete truck first arrives? Your neighbor’s using 8-ft re-bars.

a. Arrange for 20-ft re-bars instead

b. Bond the bars together using listed fittings.

c. Make sure the usual tie wires are tight.

d. Add 20 ft of No. 4 copper to the footing.

5. Suppose you wire a new house on a slab, with the service disconnect and panel let into a stud cavity on the inside of a bedroom. If you feed the panel with an exposed 3-ft run of flexible metal conduit from the meter socket, what arrangements do you have to make for the telephone installer coming the next day? You’re using rigid nonmetallic conduit for the service riser.

a. Add an approved lug to the meter socket

b. Route the grounding electrode conductor on the outside of the building.

c. Either of the above

d. Nothing