General maintenance
Arc Flash
Boundaries
Overcurrent protective devices
Establishing electrically safe work conditions
RANDOM
100

Why is regular electrical maintenance important for ensuring safety?

  1. It increases the likelihood that one-line diagrams are accurate. 
  2. It increases the likelihood that overcurrent protective devices will respond as expected. 
  3. It reduces the likelihood that equipment will not perform as expected. 
  4. All of the above. 
100

Tools and handling equipment used within the restricted approach boundary shall be   ?  .

  1. insulated 
  2. listed 
  3. provided 
  4. all of the above 
100

Which practice enhances electrical safety when replacing or inspecting OCPDs?

  1. Applying appropriate safety labels and warnings 
  2. Skipping the use of insulating gloves and protective gear 
  3. Using damaged or worn-out tools 
  4. Working alone without any supervision 
100

Determine which of the following of the eight steps in the process for establishing and verifying an electrically safe work condition must be performed in the order presented, if feasible.

  1. All of the eight steps presented 
  2. Only the first four steps presented 
  3. Only the last four steps presented 
  4. None of the steps presented 
100

What will happen to incident energy when arcing currents remain constant and clearing time is reduced?

  1. Incident energy will decrease. 
  2. Incident energy will increase. 
  3. Incident energy will stay the same. 
200

Electrical equipment must be maintained in accordance with   ?   or   ?   to reduce the risk associated with failures.

  1. “Industry consensus standards” / “Electrical contractor's safety plan” 
  2. “Manufacturer's instructions” / “Industry consensus standards” 
  3. “Owner's safety plan” / “Manufacturer's instructions” 
  4. None of the above 
200

Which of the following information is not required to be on the arc flash label per NFPA 70E?

  1. Arc flash boundary 
  2. Date 
  3. Minimum arc rating of clothing 
  4. Nominal system voltage 
200

Which of the following best describes the primary purpose of overcurrent protective devices (OCPDs) concerning arc-flash and arc-blast hazards?

  1. To increase the intensity of arc-flashes 
  2. To reduce severity of arc-flash events 
  3. To delay the response time to arc faults 
  4. To enhance the arc-blast radius 
200

The energized electrical work permit shall include, but not be limited to, means employed to restrict the access of   ?   from the work area.

  1. competent persons 
  2. qualified persons 
  3. unauthorized persons 
  4. unqualified persons 
200

Employees shall not be permitted to work where electrical hazards exist while their alertness is recognizably impaired due to fatigue, illness, and   ?  .

  1. being under the influence of banned substances 
  2. inebriation 
  3. other reasons 
  4. repetitive and similar tasks 
300

Per the 1910.333(b)(2)(ii)(B) lockout and tagging requirements of Subpart S, Electrical, in 29 CFR Part 1910, the circuits and equipment to be worked on shall be disconnected from all electric energy sources. Control circuit devices, such as push buttons, selector switches, and interlocks,   ?   be used as the sole means for deenergizing circuits or equipment.

  1. are acceptable to 
  2. can 
  3. may not 
  4. shall be permitted where identified for the purpose to 
300

Conductive articles of jewelry and clothing (such as watchbands, bracelets, rings, key chains, necklaces, metalized aprons, cloth with conductive thread, metal headgear, or metal frame glasses) shall not be worn within the   ?   approach boundary or where they present an electrical contact hazard with exposed energized electrical conductors or circuit parts.

  1. arc 
  2. limited 
  3. prohibited 
  4. restricted 
300

Which of the following is a true statement?

  1. All ICCBs and MCCBs will have an instantaneous trip function. 
  2. All PCBs do not have an instantaneous trip function. 
  3. Insulated case circuit breakers can come with or without an instantaneous trip function. 
  4. Molded case circuit breakers can come with or without an instantaneous trip function. 
300

When applying the requirements for test instruments and equipment, NFPA 70E states that only   ?   shall perform tasks such as testing, troubleshooting, and voltage measuring on electrical equipment where an electrical hazard exists.

  1. authorized persons 
  2. competent persons 
  3. qualified persons 
  4. trained persons 
300

The first step in an effective calculation of available fault currents for a power distribution system is to   ?  .

  1. calculate arcing currents 
  2. ensure all motors are turned on 
  3. ensure all tie-breakers are in the closed position 
  4. secure an accurate 1-line diagram 
400

The energy reduction maintenance switch can impact risk by   ?  .

  1. establishing an electrically safe working condition 
  2. justifying energized work 
  3. reducing likelihood of an event 
  4. reducing the severity of an event 
400

Under   ?   circumstance shall unqualified person(s) be permitted to cross the restricted approach boundary.

  1. approved 
  2. justified 
  3. limited 
  4. no 
400

Which region of the time-current characteristic (TCC) curve for a circuit breaker is leveraged by the ERMS technology?

  1. Instantaneous region 
  2. Long-time region 
  3. Short-time region 
  4. None of the above 
400

Establishing and verifying an electrically safe work condition shall include all of the steps listed in that process, which shall be performed in the order presented, if feasible. Among the steps included in the process for establishing and verifying an electrically safe work condition includes what action to take where the possibility of induced voltages or stored electrical energy exists. In this case,   ?   all circuit conductors and circuit parts before touching them

  1. de-energize 
  2. ground 
  3. label 
  4. tag 
400

The long-time pickup setting of a circuit serves which of the following purposes?

  1. Incident energy reduction 
  2. Protection of the conductor 
  3. Provide ground-fault protection 
  4. None of the above 
500

How does neglecting maintenance impact electrical safety in the workplace?

  1. Electrical safety is increased by allowing equipment to operate at its maximum capacity. 
  2. It has no effect on electrical safety. 
  3. It increases the risk of electrical hazards such as shocks, fires, and equipment failures. 
  4. Less interaction with equipment keeps electrical workers out of danger.
500

The restricted approach boundary for 480 volts AC is   ?  .

  1. 12" 
  2. 25" 
  3. 36" 
  4. 10' 
500

Which of the following OCPDs are not capable of having a short-time delay or short-time pickup setting?

  1. ICCB equipped with an electronic trip unit 
  2. MCCB equipped with an electronic trip unit 
  3. PCB equipped with an electronic trip unit 
  4. Thermal magnetic only MCCB not equipped with an electronic trip unit 
500

Energized electrical conductors and circuit parts operating at voltages equal to or greater than   ?   shall be put into an electrically safe work condition before an employee performs work if any of the two stated conditions exist. An exception to this requirement states that energized work shall be permitted where the employer can demonstrate that de-energizing introduces additional hazards or increased risk.

  1. 50 V 
  2. 100 V 
  3. 120 V 
  4. 277 V 
500

Replacing a transformer with the same kVA and voltage ratings but a lower %Z has which of the following impact on available fault current downstream?

  1. Arcing fault currents are lower 
  2. Fault currents are decreased 
  3. Fault currents are increased 
  4. Fault currents stay the same 
M
e
n
u