Determine the wiring and conduit needed for the drill presses in Figure 18.5. The conduit is to be run along the ceiling. The ceiling height is 20 feet.

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Place a single j-box between the two drill presses. Allow five feet of flexible conduit for each drill press. Mount the j-box at 4 feet. The length of conduit needed is 59 feet (15 + 28 + 16). Order the following conduit:

6 each 3/4" EMT conduit × 10'
5 each 3/4" couplings
2 each 3/4" connectors
1 each J-boxes
1 each J-box covers
10 feet 1/2" flexible conduit
4 each 1/2" connectors (flexible)
5 each hangers

Because the drill presses are single-phase, the neutral wires cannot be combined, but the grounds can. Five wires (2 hots, 2 neutrals, and 1 ground) are needed. The length of wiring needed for each drill press is 68 feet (3 + 59 + 5 + 1) for each wire. 340 feet (5 × 68') is needed.

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According to John Dewey, a teacher's primary goal is to

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