OSHA Elec practice test 9

1. An industrial worker needs to access live parts of a crane control cabinet for maintenance while the system is energized. What is the minimum required dimension for the working space in the direction of access?

1. 762 mm (2.5 ft)
2. 914 mm (3 ft)
3. 610 mm (2 ft)
4. 1067 mm (3.5 ft)

2. An electrician is repairing a damaged section of a hard-service flexible cord (No. 14 AWG) used for temporary power. According to OSHA regulations, what is the required condition for this repair?

1. The splice must retain the insulation, outer sheath properties, and usage characteristics of the original cord.
2. The splice must be wrapped in standard electrical tape and covered with a heat-shrink tube.
3. The cord must be cut and replaced entirely because flexible cords cannot be spliced.
4. The splice must be located at least 10 feet from the plug to prevent strain on the connection.

3. An electrician is installing a factory assembly of two or more insulated conductors under a nonmetallic jacket for use in a cable tray. According to the definitions in 29 CFR § 1910.399, what is the specific name for this type of cable?

1. Power and control tray cable (Type TC)
2. Power-limited tray cable (Type PLTC)
3. Open wiring on insulators
4. Premises wiring

4. A metal-enclosed switchgear unit is installed in an area accessible to unqualified persons. What additional safety measure is required for the equipment itself?

1. It must be painted high-visibility orange
2. It must be marked with appropriate caution signs
3. It must be grounded to a separate earth rod
4. It must be equipped with a manual disconnect handle

5. An electrician is installing a portable cable system operating at 2,500 volts. According to OSHA regulations, what specific feature must the cable possess to confine voltage stresses?

1. It must be shielded for the purpose of confining the voltage stresses to the insulation.
2. It must use solid conductors rather than flexible stranding to prevent voltage leakage.
3. It must be double-insulated with a non-conductive outer jacket only.
4. It must be grounded at every termination point without any shielding.

6. An electrician is grounding the noncurrent-carrying metal parts of fixed equipment. How must the equipment grounding conductor be routed relative to the circuit conductors?

1. It must be run separately from the circuit conductors for all AC and DC circuits.
2. It must be contained within the same raceway, cable, or cord, or run with or enclose the circuit conductors.
3. It must be attached to the metal rack structure only, without connecting to the circuit conductors.
4. It must be installed in a separate conduit at least 10 feet away from the circuit conductors.

7. An electrician is installing a Class 1 remote control circuit. Which of the following statements correctly describes the power output limitation for the source?

1. The source must be limited to 1000 volt-amperes.
2. The source must be limited to 30 volts and 1000 volt-amperes.
3. The power output of the source need not be limited.
4. The source must be listed equipment marked as a Class 1 power source.

8. An electrician is installing outdoor lighting fixtures in an area where energized conductors and transformers are located directly above the lamps. Under which condition is it permissible to install the lamps above these energized parts?

1. If the lamps are installed on a non-conductive ladder to keep workers away from the conductors.
2. If the energized equipment is controlled by a disconnecting means that can be locked in the open position.
3. If the voltage of the energized conductors is less than 600 volts nominal.
4. If the lamps are equipped with GFCI protection to prevent shock hazards during relamping.

9. An electrician is running open conductors for a temporary branch circuit. What is the maximum allowable interval for fastening these conductors?

1. 10 feet (3.05 m)
2. 5 feet (1.52 m)
3. 15 feet (4.57 m)
4. 20 feet (6.10 m)

10. Who must be designated by the employer to implement the assured equipment grounding conductor program for temporary wiring?

1. One or more competent persons
2. The Assistant Secretary of Labor
3. Any affected employee
4. A licensed electrician with 5 years of experience

11. A worker is operating a switch that is labeled 'Externally operable.' What does this designation guarantee about the worker's exposure to live parts during operation?

1. The worker must wear insulated gloves to operate it.
2. The worker can operate it without exposing themselves to contact with live parts.
3. The worker must deenergize the circuit before operating it.
4. The worker must use a lockout/tagout device before operating it.

12. What is the maximum interval for bonding nonenergized metal parts and raceways to metal pipes and rails throughout a tunnel?

1. 305 m (1000 ft)
2. 150 m (500 ft)
3. 60 m (200 ft)
4. 100 m (328 ft)

13. An electrician is installing a pipe system for a new building adjacent to an existing transformer vault. What restriction applies to this pipe system?

1. The pipe may enter the vault if it is insulated and sealed.
2. The pipe may pass through the vault if it carries non-combustible fluids.
3. Any pipe or duct system foreign to the vault installation shall not enter or pass through a transformer vault.
4. The pipe may enter the vault if it is grounded and bonded to the vault structure.

14. When wiring a separately derived system where the generator is a component, an electrician must bond the neutral conductor to the generator frame. What is the rule regarding other conductors in this specific scenario?

1. No other conductor need be bonded to the generator frame.
2. All ungrounded conductors must be bonded to the generator frame.
3. The equipment grounding conductor must be bonded to the vehicle frame instead.
4. The grounding electrode conductor must be bonded to the neutral bus bar.

15. An industrial worker is using a portable tool plugged into a receptacle in a wet location where the tool will be attended while in use. What is the requirement for the receptacle's enclosure?

1. The enclosure must be weatherproof when the attachment plug cap is removed.
2. The enclosure must be weatherproof with the attachment plug cap inserted or removed.
3. The enclosure must be weatherproof only when the receptacle covers are closed and no plug is inserted.
4. No enclosure is required if the tool is attended by a worker.

16. An electrician is working in a room containing exposed live parts operating at over 600 volts, nominal. Under what condition may the entrance to this room be left unlocked?

1. If the door is equipped with a self-closing mechanism.
2. If the room is under the observation of a qualified person at all times.
3. If the voltage is exactly 600 volts, nominal.
4. If the entrance is marked with a permanent warning sign.

17. A worker is installing wiring in a basement that is subject to moderate degrees of moisture but is not exposed to direct weather or saturation. How should this location be classified for electrical safety purposes?

1. Damp location
2. Dry location
3. Wet location
4. Isolated location

18. An electrician is installing a new outlet in a breakroom. Based on the definition of a 'Receptacle outlet,' what characterizes this specific installation?

1. It is an outlet where one or more receptacles are installed.
2. It is a contact device installed at the outlet for the connection of an attachment plug.
3. It is a single contact device with no other contact device on the same yoke.
4. It is two or more contact devices on the same yoke.

19. A qualified person is working near a panelboard that is not of the dead front externally-operable type. Under what condition does OSHA permit this specific type of panelboard installation?

1. When it is accessible only to qualified persons
2. When it is located in a permanently dry location
3. When it is marked 'HIGH VOLTAGE' on the outside cover
4. When it is connected to a circuit with a backfeed source

20. When installing a surface-mounted enclosure where a nonmetallic sheath cable enters through a nonflexible raceway, what is the minimum distance the cable sheath must extend into the enclosure beyond the fitting?

1. 152 mm (6 in.)
2. 305 mm (12 in.)
3. 6.35 mm (0.25 in.)
4. 457 mm (18 in.)

21. An electrician is installing fixed dust-tight equipment (other than lighting fixtures) in a Class II, Division 2 location. According to the marking requirements, what is this equipment exempt from having marked on it?

1. The class, group, division, or operating temperature
2. The manufacturer's name and model number
3. The voltage rating and amperage capacity
4. The date of manufacture and inspection

22. A worker is installing temporary branch circuit conductors as open conductors. At what interval must these conductors be fastened to ensure compliance?

1. Every 3.05 m (10.0 ft) at ceiling height
2. Every 1.5 m (5.0 ft) at floor level
3. Every 6.1 m (20.0 ft) at ceiling height
4. Only at the point of attachment to the panelboard

23. An electrician is installing power receptacles for ungrounded portable electric equipment within a cell line working zone. To comply with OSHA requirements for these specific receptacles and their mating plugs, which configuration must be used?

1. They must include a dedicated grounding conductor terminal to ensure safety.
2. They must be of a configuration that prevents their use for equipment required to be grounded.
3. They must be standard NEMA 5-15 receptacles to allow for easy interchange with grounded tools.
4. They must be installed on circuits that are grounded to the premises wiring system.

24. An electrician is working on a circuit rated at 800 volts and needs to install a switch capable of making, carrying, and interrupting specified currents. According to the definitions, what is the specific name for this type of switch?

1. Interrupter switch
2. Isolated power system
3. Motor control center
4. Oil (filled) cutout

25. A worker is preparing to service a deenergized circuit. What is the required procedure for tagging the equipment?

1. Attach a tag only at the main breaker panel
2. Attach tags at all points where the equipment or circuits can be energized
3. Attach a tag only if the circuit is energized
4. Attach a tag only to the control switches, not the circuit itself