Total Time: 4 hours
Only the Code Book May Be Used
for the Open-Book Portion
I. (Closed-Book) Test Time: 1 hour
True or False
| T | F |
1. No. 10 conductors may be connected by screws and nuts with upturned lugs. | [ ] | [ ] |
2. Medium-base lamps may be used on branch circuits of 30 amperes. | [ ] | [ ] |
3. EMT shall be supported at least every 15 feet. | [ ] | [ ] |
4. The wiring for a discontinued outlet in a cellular metal floor raceway shall be removed from the raceway. | [ ] | [ ] |
5. The minimum length for a pull box with 2-inch conduits for a straight pull is 16 inches. | [ ] | [ ] |
6. Wall-mounted ovens and counter-mounted cooking units are permitted to be cord- and plug-connected. | [ ] | [ ] |
7. Wiring beneath the dispenser in a gas station is considered Class II, Division 1 wiring. | [ ] | [ ] |
8. A motor disconnecting means located within 75 feet of the motor and visible is “in sight.” | [ ] | [ ] |
9. An emergency storage battery shall be capable of supplying 87½% of system voltage for at least 90 minutes. | [ ] | [ ] |
10. A lighting and appliance panelboard is allowed 42 overcurrent devices including the mains. | [ ] | [ ] |
11. A lighting and appliance panelboard has 10% of its overcurrent devices rated 30 amperes or less with neutral connections. | [ ] | [ ] |
12. The disconnecting means in a data-processing room shall disconnect: |
|
|
(a) Ventilation system | [ ] | [ ] |
(b) Receptacles for computer equipment | [ ] | [ ] |
(c) Lighting | [ ] | [ ] |
(d) Emergency system | [ ] | [ ] |
13. The recommended grounding method is to bond the neutral terminal to the service equipment at the service. | [ ] | [ ] |
14. The highest voltage-to-ground in an industrial establishment for electric discharge lighting circuits is 240 volts. | [ ] | [ ] |
15. The total equivalent bend in conduit between outlet and outlet, fitting and fitting, or outlet and fitting shall not exceed 360°. | [ ] | [ ] |
16. Conduit bound to a box by double locknuts is considered bonded in an acceptable manner. | [ ] | [ ] |
Multiple Choice
Fill in the Blanks
1. How many thermal overload units are needed for a three-phase motor? ________
2. A 2400-watt load at 120 volts has what resistance? ________
3. How shall the conductor having the higher voltage to ground be identified on a four-wire, delta-connected secondary? ________
4. How many amperes does a 100-kilowatt load with a .8 power factor draw in a 480-volt, three-phasecircuit? ________
5. A megger is used to measure? ________
6. A 50-kilovolt-ampere load operates at .5 power factor. How many kilowatt-hours are used in 10 hours?________
Diagrams
1.
Connect the three-phase transformer for a 480-volt delta primary to a 208Y/120-volt secondary.
2. Connect three start-stop units for a motor.
Local Ordinance Questions
This part depends on the local ordinance. Usually, there will be five or more questions from the Electrical Code of the city or state giving the examination.
II. Problems (Open-Book)
Test Time: 3 Hours
1. Design the wiring system for a 12-unit apartment complex consisting of the following types of units:
(a) Six 1800-square-foot units equipped with the following:
(1) 5-kilowatt, 240-volt hot-water heater
(2) Six 2-kilowatt, 240-volt space heaters
(3) Four 4.9-ampere, 240-volt air conditioners
(4) 4.5-kilowatt, 240-volt dryer
(5) 120-volt washer
(6) 12-kilowatt range
(b) Four 1200-square-foot units equipped with the following:
(1) 5-kilowatt, 240-volt hot-water heater
(2) Six 2-kilowatt, 240-volt space heaters
(3) Four 4.9-ampere, 240-volt air conditioners
(4) 4.5-kilowatt, 240-volt dryer
(5) 120-volt washer
(6) 10-kilowatt range
(c) Two 900-square-foot units equipped with the following:
(1) 8¾-kilowatt range
(2) No washer (not permitted)
(3) Four 2-kilowatt, 240-volt space heaters
(4) Two 4.9-ampere, 240-volt air conditioners
Determine (1) the required number and ratings of branch circuits for each type of unit, (2) the feeder (THW aluminum) and conduit size for each type of unit, and (3) the main service by using both the standard and optional methods.
2. A new installation of 400 four-tube, 40-watt fluorescent fixtures is planned. Find the required number of branch circuits if the circuits are 277 volts and the power factor of the units is .80. How large must the feeder conductors supplying the lighting panelboard be?
3. The following loads are supplied by a 480-volt, three-phase feeder: Two 60-horsepower motors, two 30-horsepower motors, four 10-horsepower motors, four 3-horsepower motors, and a 10-kilowatt heating load. Determine the ampacity of the feeder conductors. What size standard disconnecting means would be used?
4. The 230-volt, single-phase motor loads on a feeder are as follows:
Two 10-horsepower | Three 1-horsepower |
Two 5-horsepower | Three ¾-horsepower |
Four 3-horsepower | Three -horsepower |
Find the feeder size and overcurrent protection required if the branch circuits are protected by nontime-delay fuses.
5. What size conduit is required to contain four No. 4/0, four No. 2, and four No. 6 THW conductors?
6. A small store is served by a 120/240-volt service. The store contains the following:
(a) 32-foot-long show window
(b) Twenty-one 200-watt floor lamps
(c) 21 receptacles (continuous)
(d) Twenty-one 150-watt lamps
Determine (1) the required number of branch circuits if 20-ampere circuits are used and (2) the service rating and conductor size.
7. What is the size of conduit required and the ampacity of the conductor if eight No. 8 type THHN copper conductors are to be enclosed in conduit in an ambient of 60°C.
18.227.72.153