1. Determine the tension in the cable, and sidewall pressure where applicable for four 300 kcmil XHHW-2 single conductor copper cables installed in 3" rigid steel conduit under the following conditions. Assume a tension equal to 100 lb at the input to the conduit section, and a weight correction factor of 1.4 for all calculations. (CH 8)

a) 300 ft straight pull

b) 25 ft pull up 45 inclune

c) pull around 90 sweep, 24" radius

2. Determine the minimum trade size rigid steel conduit required to accommodate four 300 kcmil THW copper conductors and one #2/0 AWG (0.1379 in²) bare copper ground conductor. (CH 8)

3. A residence supplied by a 120/240V, single phase, three wire service has a total estimated demand load of 25,000 VA. The total estimated neutral loading is 17,000 VA. Determine the service over-current protection HHW aluminum conductor, 75° C device terminal ratings, and allow 25% load growth. (CH 9)

4. Determine the percent imbalance for a 120/240V, 3-phase, 4-wire panel having 135 A, 105 A, and 75 A phase currents, respectively. Is this acceptable? What is the solution? (CH 11)

5. What is the required rating of a standard disconnect used for a 50 HP, 460 V, design E motor having a nameplate current of 72 A? (CH 13)

6. A 225 kVA, 12.47 kV - 480Y/277 V 3-phase transformers has an impedance of 2.7% and an X/R ratio of 1.8. Determine the ohmic resistance and reactance of the transformer referred to the low voltage side. (CH 14)

7. An industrial plant is supplied service at 480Y/277 V, 3-phase, 4-wire. The plant has an active power demand of 1200 kW @ PF= 0.80 lagging. Determine: (CH 15)

a) apparent power demand

b) reactive power demand

c) line current magnitude

d) rating of the capacitor bank required to improve power factor at 0.95 lagging

e) active, reactive and apparent power after addition of the capacitors

f) line current magnitude after addition of the capacitors