60 free questions with answers, explanations and the source for each. Answer one to see why. No sign-up.
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1 / 60
During a utility outage on the job, a portable generator will feed the building's premises wiring system. Under 2320.9, the connection is allowed only if:
2320.9: no power source, permanent or temporary, may be connected to a premises wiring system unless positive means prevent the transmission of electricity beyond that premises wiring system (unless the serving utility authorized the interconnection).
Source: T8 2320.9
2 / 60
A branch circuit on a construction site supplies temporary lighting. Under 590.4, receptacles on construction sites:
590.4: receptacles on construction sites shall not be installed on any branch circuit that supplies temporary lighting.
Source: CEC 590.4
3 / 60
During a remodel, your crew plugs saws into an existing 125-volt, single-phase, 20-ampere receptacle outlet that is part of the permanent wiring of the house and is being used for temporary electric power. Under 590.6, that outlet requires:
590.6: GFCI protection for personnel shall be provided for all 125-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets installed or existing as part of the permanent wiring and used for temporary electric power.
Source: CEC 590.6
4 / 60
Under 3314, employees whose work may be in an area where lockout is used, but who are not doing the servicing, must be instructed about:
3314: all other employees whose work may be in an area where energy control procedures are used shall be instructed about the prohibition on attempts to restart or reenergize equipment that is locked out or tagged out.
Source: T8 3314
5 / 60
Under the note to 3381, Type II helmets are intended to reduce the force of impact from a blow to:
Note to 3381: Type I helmets reduce impact from a blow only to the top of the head; Type II helmets reduce impact from a blow to the top or sides of the head.
Source: T8 3381
6 / 60
CEC Article 500 covers:
CEC Article 500 covers area classification and general requirements for electrical and electronic equipment and wiring at all voltages where fire or explosion hazards might exist due to flammable gases, flammable or combustible liquid-produced vapors, combustible dusts, or fibers/flyings (CEC 500.1).
Source: CEC Article 500
7 / 60
Under Cal/OSHA 3220, an emergency action plan must include, at a minimum:
An emergency action plan must be in writing and include, at a minimum: procedures for emergency evacuation, including type of evacuation and exit route assignments; procedures to account for all employees after evacuation; the preferred means of reporting fires and other emergencies; and contacts for further information (Cal/OSHA 3220(b)).
Source: Emergency response
8 / 60
Electrical retests of in-service rubber insulating gloves must be no more than ___ apart:
ASTM F496-08, which Cal/OSHA 2320.2 incorporates, provides that electrical retests shall not exceed 6 months for insulating gloves and 12 months for insulating sleeves.
Source: OSHA 29 CFR 1910.137 (Table I-5)
9 / 60
A crane boom contacts an overhead line and the ground around the truck becomes energized. Under Appendix E of 2945, step potential is:
Appendix E of 2945: step potential is the voltage between the feet of a person standing near an energized grounded object; a person can be hurt during a fault just by standing near it.
Source: T8 2945 App E
10 / 60
Under Cal/OSHA section 3314(g), the employer's hazardous energy control procedure must include:
The hazardous energy control procedure must include the requirements for testing a machine or equipment to determine and verify the effectiveness of lockout devices, tagout devices and other hazardous energy control devices (Cal/OSHA 3314(g)).
Source: OSHA 29 CFR 1910.147(d)(6); Cal/OSHA Title 8 §3314(g)(1)(D)
11 / 60
Under Cal/OSHA's outdoor heat illness standard, at what outdoor temperature must an employer have shade present and available for employees' rest and recovery?
Shade shall be present when the temperature exceeds 80 degrees Fahrenheit (Cal/OSHA 3395(d)(1)).
Source: Cal/OSHA Title 8 §3395(d)
12 / 60
Under 2405.4, cord sets and receptacles that are fixed and not exposed to damage must be tested at intervals not exceeding:
2405.4: tests are generally repeated at intervals not to exceed three months, but cord sets and receptacles that are fixed and not exposed to damage are tested at intervals not exceeding 6 months.
Source: T8 2405.4
13 / 60
Under 590.6, in an assured equipment grounding conductor program, the continuity and terminal tests of cord sets must be repeated at intervals not exceeding:
590.6: under an assured equipment grounding conductor program, the required tests are done before first use on site, when there is evidence of damage, after repairs, and at intervals not exceeding 3 months.
Source: CEC 590.6
14 / 60
Cord-and-plug equipment on a jobsite must have its ___ intact for safety:
Under an assured equipment grounding conductor program, each receptacle and attachment cap or plug is tested for correct attachment of the equipment grounding conductor (Cal/OSHA 2405.4(d)). Double-insulated tools or similar equipment are not required to be grounded.
Source: Equipment grounding
15 / 60
Under 2320.2, when connecting deenergized equipment to an energized circuit by means of a conducting wire, the employee must first attach the wire to:
2320.2: in connecting deenergized equipment or lines to an energized circuit with a conducting wire or device, the employee shall first attach the wire to the deenergized part.
Source: T8 2320.2
16 / 60
Where the ladder or its user may contact the unprotected energized overhead service drop, Cal/OSHA 3276 requires the ladder to be:
Non-conductive ladders shall be used in locations where the ladder or user may contact unprotected energized electrical conductors or equipment (Cal/OSHA 3276(e)(18)).
Source: OSHA / Cal/OSHA (non-conductive ladders)
17 / 60
You are repairing cord and plug-connected electric equipment (a portable pump). Under the 3314 exception, the hazard of unexpected start up is controlled when the pump is unplugged and the plug is kept:
3314 exception: work on cord and plug-connected equipment is covered when the equipment is unplugged from the energy source and the plug is under the exclusive control of the employee performing the work.
Source: T8 3314
18 / 60
Cal/OSHA's two accepted options for ground-fault protection on construction sites are GFCI protection or:
To protect employees on construction sites, the employer must use ground-fault circuit interrupters, an assured equipment grounding conductor program, or both (Cal/OSHA 2405.4). The assured program must have a written description at the job site, one or more designated qualified persons, daily visual inspection of cord sets and cord-and-plug equipment, and continuity and correct-attachment tests of the equipment grounding conductor.
Source: OSHA 1926.404(b)(1)
19 / 60
Under Cal/OSHA 2946 Table 2, the minimum clearance for boom-type lifting or hoisting equipment from lines over 50,000 up to 75,000 volts is:
Table 2 of Cal/OSHA 2946 requires 11 feet for boom-type lifting or hoisting equipment near lines over 50,000 up to 75,000 volts; the requirement is 10 feet at 600 to 50,000 volts and keeps rising with voltage.
Source: Cal/OSHA Title 8 §2946
20 / 60
Under 1519, safety devices and protective clothing worn by one employee may be interchanged with another employee once they have been:
1519: safety devices, including protective clothing worn by an employee, shall not be interchanged among employees until properly cleaned.
Source: T8 1519
21 / 60
Under a group lockout arrangement, who carries the duty of coordinating and monitoring the status of the crew's energy control?
Group lockout requires primary responsibility to be vested in an authorized employee overseeing a defined set of workers under the group device.
Source: Cal/OSHA Title 8 §3314(h); OSHA 29 CFR 1910.147(f)(3)
22 / 60
Under 1514, all personal protective equipment must be selected to ensure that it:
1514: all personal protective equipment shall be selected to ensure that it properly fits each affected employee.
Source: T8 1514
23 / 60
A damaged extension cord (cut jacket, exposed conductors) should be:
Equipment found damaged or defective must not be used until repaired (Cal/OSHA 2405.4(d)).
Source: Jobsite cord safety
24 / 60
Under Cal/OSHA 2946 Table 2, boom-type lifting or hoisting equipment must stay at least how far from energized overhead high-voltage lines of 600 to 50,000 volts (phase to phase)?
Cal/OSHA 2946 Table 2 sets a minimum required clearance of 10 feet between boom-type lifting or hoisting equipment and energized overhead high-voltage lines of 600 to 50,000 volts phase to phase.
Source: Cal/OSHA Title 8 §2946
25 / 60
An imminent hazard is found on the job that cannot be immediately fixed without endangering workers. Under 3203, the employer's Injury and Illness Prevention Program procedure is to:
3203: when an imminent hazard exists that cannot be immediately abated without endangering employees or property, remove all exposed personnel from the area except those necessary to correct the condition, and give them the necessary safeguards.
Source: T8 3203
26 / 60
Who may remove a locking device and tag from de-energized electrical equipment?
Locking devices and tags may be removed only by the employee who placed them. When that employee has left the premises or is otherwise unavailable, other persons may be authorized by the employer to remove them in accordance with a procedure determined by the employer (Cal/OSHA 2320.5).
Source: Cal/OSHA Title 8 §3314
27 / 60
Once the electrical equipment involved in a fire has been de-energized, Cal/OSHA 6150 says which extinguishers may be used safely?
Class C fires involve energized electrical equipment, where a nonconductive extinguishing agent matters; when the electrical equipment is de-energized, extinguishers for Class A or B fires may be used safely (Cal/OSHA 6150).
Source: Electrical fire safety
28 / 60
Under the note to 2320.2, the maximum interval between electrical retests of rubber insulating sleeves is:
The note to 2320.2 says electrical retests shall not exceed 6 months for insulating gloves and 12 months for insulating sleeves.
Source: T8 2320.2
29 / 60
In California, boom-type lifting/hoisting equipment (cranes, lifts) may not be operated closer than ___ to overhead high-voltage lines of 50 kV or less:
Cal/OSHA 2946 Table 2 requires boom-type lifting or hoisting equipment to stay at least 10 feet from energized overhead lines of 600 to 50,000 volts (phase to phase). The general clearance in Table 1 for the same voltage range is 6 feet.
Source: Cal/OSHA Title 8 §2946
30 / 60
Under the exception in 2320.2, insulating gloves or insulated tools may be omitted on exposed energized parts only when a qualified person has made a conclusive determination before work starts that there is no exposure to shock, burns, explosion or arc hazards, and the parts are energized at:
2320.2 exception: gloves, insulated tools or other protective measures are not required on parts energized at less than 50 volts, provided a qualified person conclusively determines before work starts that there is no exposure to shock, burns, explosion or arc hazards.
Source: T8 2320.2
31 / 60
During cleaning, servicing and adjusting, machinery capable of movement must be stopped and its power source de-energized or disengaged. If necessary, its moveable parts must also be:
Machinery or equipment capable of movement must be stopped and the power source de-energized or disengaged, and, if necessary, the moveable parts must be mechanically blocked or locked out to prevent inadvertent movement or release of stored energy during cleaning, servicing and adjusting operations (Cal/OSHA 3314(c)).
Cal/OSHA 2945 Appendix E notes that a worker's skin resistance can drop near zero when:
Skin resistance can drop near zero when there are breaks in the worker's skin, such as cuts or blisters, or when the worker is wet at the points of contact, leaving only the body's internal resistance (Cal/OSHA 2945, Appendix E).
Source: Body resistance
33 / 60
Under 3276, a Medium-Duty Type II ladder has a working load of:
3276 duty ratings: Special Duty IAA 375, Extra Heavy-Duty IA 300, Heavy-Duty I 250, Medium-Duty II 225, Light-Duty III 200 pounds working load.
Source: T8 3276
34 / 60
A worker is holding the outrigger of a boom truck when the boom contacts an overhead line. Under Appendix E of 2945, the voltage between that energized grounded object and the worker's feet is called:
Appendix E of 2945: touch potential is the voltage between the energized grounded object and the feet of a person in contact with the object.
Source: T8 2945 App E
35 / 60
Rubber insulating gloves used for energized work must be rated for the system voltage and worn with:
Rubber insulating gloves must match the voltage and normally require leather protectors over them.
Source: Rubber insulating glove PPE
36 / 60
Under CEC 590.6, temporary 125 V, 15-, 20- and 30-ampere receptacle outlets that are not part of the permanent wiring and are used by personnel require:
All 125-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets that are not part of the permanent wiring and are in use by personnel must have ground-fault circuit-interrupter protection for personnel (CEC 590.6(A)).
Source: CEC 590.6
37 / 60
Under Cal/OSHA 3381, where there is a risk of head injury from contact with conductors less than 600 volts, protective helmets must be ANSI Z89.1:
When there is a risk of head injury from contact with conductors less than 600 volts, protective helmets must be ANSI-Z89.1 designated Class E or G (Cal/OSHA 3381).
Source: ANSI/ISEA Z89.1 (Class G)
38 / 60
A 'seal-off' fitting in a hazardous-location conduit run:
Seals in conduit and cable systems in Class I locations minimize the passage of gases and vapors and prevent the passage of flames from one portion of the system to another (CEC 501.15).
Source: CEC 501.15
39 / 60
A Class A GFCI protecting people on temporary jobsite power trips when the ground-fault current is:
Per the CEC definition of a ground-fault circuit interrupter, Class A GFCIs trip when the ground-fault current is 6 mA or higher and do not trip when it is less than 4 mA.
Source: Class A GFCI
40 / 60
Under Cal/OSHA 2940.11, the arc rating of protective clothing and the estimated heat energy it must match are expressed in:
Cal/OSHA 2940.11 requires protective clothing with an arc rating greater than or equal to the estimated heat energy whenever that estimate exceeds 2.0 cal/cm2, so both are stated in calories per square centimeter.
Source: NFPA 70E arc rating
41 / 60
Under the assured grounding program rules of 2405.4, a cord set that is moved around the jobsite must be visually inspected for defects such as missing pins or insulation damage:
2405.4: each cord set, plug, receptacle and cord-and-plug equipment (except fixed items not exposed to damage) shall be visually inspected before each day's use for external defects and signs of internal damage.
Source: T8 2405.4
42 / 60
Many Electrical Safety Orders assign duties to an "authorized person." Under the 2300 definitions, an Authorized Person is:
2300: an Authorized Person is a qualified person delegated to perform specific duties under the conditions existing.
Source: T8 2300
43 / 60
In a group lockout, each authorized employee removes their personal lockout or tagout device from the group lockout device:
Each authorized employee must affix a personal lockout or tagout device to the group lockout device, group lockbox, or comparable mechanism when beginning work, and remove it when they stop working on the machine or equipment being serviced or maintained (Cal/OSHA 3314(h)).
Source: Cal/OSHA Title 8 §3314
44 / 60
Under Table 2 of 2946, the minimum clearance for boom-type lifting or hoisting equipment from energized overhead lines of over 75,000 to 125,000 volts phase to phase is:
2946 Table 2 (material storage and boom-type lifting or hoisting equipment): 600 to 50,000 volts, 10 feet; over 50,000 to 75,000 volts, 11 feet; over 75,000 to 125,000 volts, 13 feet.
Source: T8 2946
45 / 60
Under 3276, the maximum length of a two-section extension ladder made of metal is:
3276: ladders longer than the listed maximum lengths shall not be used; a two-section metal extension ladder is limited to 48 feet (a wood one to 60 feet).
Source: T8 3276
46 / 60
Under 3314, the attachment means for a tagout device (such as a one-piece nylon tie) must have a minimum unlocking strength of:
3314: tagout device attachment means must be non-reusable, attachable by hand, self-locking, and non-releasable, with a minimum unlocking strength of no less than 50 pounds.
Source: T8 3314
47 / 60
The safe ladder placement ratio (base out to height up) is:
Where possible, single and extension ladders are used at a pitch where the horizontal distance from the top support to the foot of the ladder is one-quarter of the working length of the ladder (Cal/OSHA 3276(e)).
Source: Ladder safety (4:1 rule)
48 / 60
Under an assured equipment grounding conductor program (2405.4), a delivery truck drives across a cord set on the site. The continuity and terminal tests on that cord set must be done:
2405.4: the required tests are performed before equipment is used after any incident reasonably suspected to have caused damage, for example when a cord set is run over.
Source: T8 2405.4
49 / 60
Flexible cords passing through doorways or other pinch points must be:
Flexible cords at doorways/pinch points must be protected against physical damage.
Source: OSHA 1926 / CEC 590 (cord protection)
50 / 60
Under Cal/OSHA 3381, an ANSI Z89.1 Class C helmet may be used only when:
Class C is among the classes allowed only when there is no risk of head injury from contact with electrical conductors and helmets are needed only for flying or falling objects; with conductors under 600 volts Class E or G is required, and over 600 volts Class E (Cal/OSHA 3381).
Source: ANSI/ISEA Z89.1 (Class C)
51 / 60
Under Table 1 of 2946, the minimum clearance required between any part of an employee's body (or a tool or material being handled) and energized overhead lines of 600 to 50,000 volts phase to phase is:
2946: no tool, material or part of an employee's body may come closer to energized overhead lines than Table 1 allows; for 600 to 50,000 volts the minimum required clearance is 6 feet.
Source: T8 2946
52 / 60
Besides a top rail, a complete guardrail system includes a midrail and a:
A standard toeboard is 4 inches (nominal) minimum in height, securely fastened, with not more than 1/4-inch clearance above the floor; toeboards are required on open sides and ends of railed scaffolds where persons work or pass underneath (Cal/OSHA 1621).
Source: OSHA 1926.502(b), (j)
53 / 60
Under 2405.3, a temporary wood pole must be long enough to keep all required overhead clearances, but its length must be at least:
2405.3: a temporary wood pole must be long enough to maintain the required overhead clearances, but not less than 20 feet long.
Source: T8 2405.3
54 / 60
Multi-conductor extension cords used for temporary wiring on a construction site must be:
Multi-conductor cords and cables for temporary wiring must be hard service type or equivalent, with multi-conductor fittings (Cal/OSHA 2405.2), and equipment found damaged or defective must not be used until repaired (Cal/OSHA 2405.4).
Source: OSHA 1926 / CEC 590 (flexible cords)
55 / 60
Under 3314, who performs the periodic inspection of a hazardous energy control procedure?
3314: the periodic inspection shall be performed by an authorized employee or person other than the one(s) using the hazardous energy control procedure being inspected.
Source: T8 3314
56 / 60
A railing (guardrail) must withstand a force of at least:
All railings, including their connections and anchorage, must withstand without failure a force of at least 200 pounds applied to the top rail within 2 inches of the top edge, in any outward or downward direction (Cal/OSHA 1620(c)).
Source: OSHA 1926.502(b)(3)
57 / 60
The proper extinguisher for an energized electrical (Class C) fire is:
For a Class C rating the extinguishing agent must be a nonconductor of electricity (Cal/OSHA 6150).
Source: Fire extinguishers (NFPA 10)
58 / 60
Cal/OSHA 2945 Appendix E says the degree of hazard from an electric shock depends on:
In all cases, the degree of the hazard depends on the magnitude of the current through the employee and the time of exposure (Cal/OSHA 2945, Appendix E).
Source: Electrical-injury science
59 / 60
Under 2320.7, which of these is prohibited when working on or near exposed energized conductors?
2320.7: conductive measuring tapes, ropes or similar measuring devices shall not be used when working on or near exposed energized conductors or parts of equipment.
Source: T8 2320.7
60 / 60
Under Cal/OSHA 3276, a heavy-duty Type I ladder, commonly used by tradespeople, has a working load of:
Cal/OSHA 3276(d)(2) lists a working load of 250 pounds for a heavy-duty Type I ladder (Type IA is 300, Type IAA is 375, Type II is 225 and Type III is 200).