OSHA Elec practice test 10

1. An electrician is running single conductor cable for a carnival attraction. What is the minimum wire size required by OSHA for this application?

1. No. 14
2. No. 12
3. No. 10
4. No. 2

2. An electrician is measuring the working space depth in front of a panelboard with exposed live parts to ensure compliance with OSHA standards. From which point must this distance be measured?

1. From the front face of the enclosure or opening if the live parts are enclosed.
2. From the back wall of the electrical room.
3. From the center of the equipment cabinet.
4. From the nearest structural column in the room.

3. An industrial worker is installing electrical equipment outdoors where it will be exposed to rain, snow, and dust. To ensure the equipment is considered 'weatherproof' under OSHA definitions, what condition must be met regarding non-wetness weather factors?

1. The equipment must be rainproof, raintight, or watertight, provided that factors like snow, ice, dust, or temperature extremes are not a factor.
2. The equipment must be watertight only, as rainproof equipment is insufficient for outdoor use.
3. The equipment must be designed to withstand all weather conditions including extreme heat and dust regardless of its rating.
4. The equipment must be protected by a roof, as weatherproof equipment cannot be used directly in the elements.

4. An electrician is setting up an amusement ride at a fair near overhead conductors operating at 600 volts or less. What is the minimum required clearance distance between the ride and the conductors?

1. 3.05 m (10 ft)
2. 4.57 m (15 ft)
3. 6.10 m (20 ft)
4. 7.62 m (25 ft)

5. An electrician is working on an ungrounded separately derived system. Where must the equipment grounding conductor be connected to the grounding electrode conductor?

1. At, or ahead of, the system disconnecting means or overcurrent devices
2. At the service equipment only
3. At the load side of the final overcurrent device
4. At the generator frame only

6. An industrial worker needs safe access to electric equipment installed on a mezzanine floor. What type of access must be provided?

1. A portable ladder secured to the railing
2. Permanent ladders or stairways
3. A scissor lift with a safety cage
4. A temporary ramp with non-slip surface

7. An electrician is working on indoor electrical installations that are accessible to other than qualified persons. Which of the following is a required safety measure for metal-enclosed switchgear and similar associated equipment in this area?

1. They shall be marked with appropriate caution signs.
2. They shall be enclosed in a vault with no ventilation.
3. They shall be accessible only by a key that is kept by the shift supervisor.
4. They shall be painted yellow to indicate high voltage.

8. An electrician is installing open conductors smaller than No. 8 and is creating a tap or splice. To ensure proper support, how close to the tap or splice must a support be installed?

1. Within 305 mm (12 in.)
2. Within 152 mm (6 in.)
3. Within 457 mm (18 in.)
4. At intervals not exceeding 1.37 m (4.5 ft)

9. An electrician is splicing two aluminum conductors together. According to the rules for splicing and joining conductors, what is the correct procedure for a soldered splice?

1. The splice must first be mechanically and electrically secure without solder, and then soldered.
2. The conductors should be twisted together and immediately soldered to ensure conductivity.
3. The splice must be covered with insulation before applying any solder.
4. Soldering is not permitted for aluminum conductors; they must be welded.

10. When installing temporary lighting circuits, how must receptacles be handled in relation to the ungrounded conductors supplying temporary lighting?

1. Receptacles shall not be connected to the same ungrounded conductor of multiwire circuits which supply temporary lighting.
2. Receptacles may be connected to any phase of the multiwire circuit supplying temporary lighting.
3. Receptacles must be installed on the same branch circuit as the temporary lighting to ensure grounding.
4. Receptacles are exempt from grounding requirements if they are used for temporary lighting.

11. An electrician is installing a junction box containing a terminal block where a copper conductor and an aluminum conductor will physically touch inside the connector. Under what specific condition is this intermixing of dissimilar metals permitted?

1. If the conductors are twisted together tightly before insertion.
2. If the device is identified for the purpose and conditions of use.
3. If the copper conductor is tinned prior to insertion.
4. If the aluminum conductor is smaller than the copper conductor.

12. An electrician is performing routine opening and closing of an energized circuit under load conditions. Which device must be used for this operation?

1. Load rated switches, circuit breakers, or other devices specifically designed as disconnecting means.
2. Cable connectors not of the load-break type.
3. Fuses.
4. Terminal lugs.

13. An electrician is working on fixed equipment where any terminal operates at over 150 volts to ground. What is the requirement for the exposed noncurrent-carrying metal parts of this equipment?

1. They shall be grounded.
2. They need not be grounded if the equipment is mounted on a wooden pole.
3. They need not be grounded if the equipment is a switch enclosure accessible to qualified persons.
4. They need not be grounded if the equipment is in a dry location.

14. An electrician is installing metal enclosures for conductors on an existing open wire installation. Under which set of conditions is the electrician permitted to leave these new metal enclosures ungrounded?

1. The runs are less than 25 feet, the enclosures are free from probable contact with ground or conductive materials, and they are guarded against employee contact.
2. The runs are less than 50 feet, the enclosures are painted non-conductively, and they are located in a dry location.
3. The runs are less than 25 feet, the enclosures are bonded to the neutral conductor, and they are accessible to qualified persons only.
4. The runs are less than 10 feet, the enclosures are made of aluminum, and they are installed in a hazardous location.

15. An electrician is preparing to work on exposed live parts. Under what specific condition is the employer permitted to allow the electrician to work on or near these energized parts without first deenergizing them?

1. If the employer can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations.
2. If the electrician is wearing Class 0 insulated gloves and has a second qualified person standing by as a spotter.
3. If the voltage is less than 600 volts and the electrician has completed annual refresher training.
4. If the work is scheduled during a shift change when the facility is less crowded.

16. An electrician is installing listed equipment that requires specific installation steps to maintain its safety certification. What is the required practice for installation and use?

1. Install it using standard industry practices regardless of the label
2. Install and use it in accordance with instructions included in the listing, labeling, or certification
3. Modify the equipment to fit the specific jobsite constraints
4. Install it only if it is less than five years old

17. A worker is using a tool likely to be used in a wet and conductive location. Under which specific exception does this tool NOT need to be grounded?

1. If it is supplied through an isolating transformer with an ungrounded secondary of not over 50 volts.
2. If it is supplied through an isolating transformer with an ungrounded secondary of 60 volts.
3. If it is supplied through a standard transformer with a grounded secondary of 50 volts.
4. If it is supplied through an isolating transformer with a grounded secondary of 50 volts.

18. An electrician is installing a raceway on a pole for conductors emerging from the ground. What is the minimum height above finished grade to which the raceway must extend if using rigid metal conduit?

1. 4 feet (1.22 m)
2. 6 feet (1.83 m)
3. 8 feet (2.44 m)
4. 10 feet (3.05 m)

19. An electrician is servicing a controller on a multicar elevator installation. After opening the disconnecting means, they notice that parts of the controller remain energized from a source other than the one they disconnected. What is the required safety measure for this specific situation?

1. A warning sign must be mounted on or next to the disconnecting means stating that parts of the controller are not deenergized by this switch.
2. The electrician must manually disconnect the secondary source before proceeding with any work on the controller.
3. The disconnecting means must be replaced with a double-pole breaker to isolate all sources simultaneously.
4. The controller enclosure must be locked closed until the secondary source is verified as deenergized by a second qualified person.

20. An electrician is working on a transformer installation indoors. If the transformer is oil-insulated, what is the required installation method?

1. It must be installed in a vault.
2. It can be installed openly if it is rated under 35kV.
3. It must be installed in a vault only if it is dry-type.
4. It can be installed anywhere indoors provided it is locked.

21. An industrial worker is inspecting a two-wire DC system operating at 100 volts between conductors. The system is not grounded. Which of the following scenarios justifies this lack of grounding under OSHA rules?

1. The system supplies only industrial equipment in limited areas and is equipped with a ground detector
2. The system supplies general office lighting and is equipped with a ground detector
3. The system supplies only industrial equipment in limited areas but lacks a ground detector
4. The system is rectifier-derived from an AC system that does not comply with grounding requirements

22. An electrician is selecting a flexible cord assembly for a temporary power connection. The assembly consists of insulated conductors within a flexible metallic enclosure. What is the specific OSHA-defined name for this type of cable?

1. Armored cable (Type AC)
2. Conduit
3. Raceway
4. Non-metallic sheathed cable

23. A worker needs to inspect a disconnect switch quickly. To meet the definition of 'Readily accessible,' what condition must be met regarding the path to the equipment?

1. The worker must be able to reach it without climbing over obstacles or using portable ladders.
2. The worker must be able to reach it by removing a locked cabinet door with a key.
3. The worker must be able to reach it by climbing over a stack of materials if no ladder is available.
4. The worker must be able to reach it only after shutting down the main power source.

24. An electrician is working on a high-voltage installation where equipment is guarded by location and isolated from ground. Under what condition is this equipment exempt from grounding requirements?

1. When the equipment is pole-mounted distribution apparatus at a height exceeding 2.44 m (8.0 ft) above ground or grade level.
2. When the equipment is installed in a wet location.
3. When the equipment is part of a delta-connected system without a derived neutral.
4. When the equipment is used for temporary wiring less than 30 days.

25. An electrician is installing a sprinkler system controller in a wet location. The controller is not attended while in use. What is the requirement for the receptacle's enclosure?

1. The enclosure must be weatherproof with the attachment plug cap inserted or removed.
2. The enclosure must be weatherproof when the attachment plug cap is removed.
3. The enclosure must be weatherproof when the receptacle is covered (attachment plug cap not inserted).
4. The enclosure must be suitable for the location but need not be weatherproof if the device is unattended.