electrical safety

Question 1

Too often a culture exists in the workplace where workers are routinely allowed and expected to work on or near energized electrical circuits. This could be due to which of the following?

Answer 1

Failure to realize how quickly a situation might change and cause an energy release

Question 2

It is less likely that workers, contractors, and facility owners would allow energized work if everyone involved in the decision-making process fully understood the laws, requirements, hazards, true costs, and consequences associated with energized work.

Answer 2

True

Question 3

Working on energized circuits is part of the job and should be considered a routine part of the electrical work that an Electrical Worker performs.

Answer 3

False

Question 4

Which of the following are likely outcomes when energized work is performed when it is not justified?

I. Contractors and their clients are exposed to undue risks of increased insurance premiums and loss of production.
II. Contractors and their clients are in compliance with OSHA requirements.
III. Workers expose themselves to few or no hazards.
IV. Workers expose themselves to potential injury or death.

Answer 4

i + iv

Question 5

Equipment or circuits that are not deenergized as part of a scheduled shutdown ultimately could end up unintentionally being shut down for an extended period of time. This could be due to an unplanned event, such as a dropped tool or a loose part falling into energized equipment, creating an unscheduled shutdown.

Answer 5

True

Question 6

A well-informed client understands the hazards of ? work and the financial implications associated with an electrical incident, and is ? to permit energized work.

Answer 6

energized/less likely

Question 7

A full understanding and recognition of existing and potential hazards is an essential part of ensuring that an environment is electrically safe.

Answer 7

True

Question 8

Class A ground-fault circuit interrupters (GFCIs) trip when the current to ground is ? or higher.

Answer 8

6 mA

Question 9

Class A ground-fault circuit interrupters (GFCIs) trip when the current to ground is ? or higher.

Answer 9

6 mA

Question 10

Electrical protective equipment provides limited protection against electrical hazards.

Answer 10

true

Question 11

An arc-flash hazard is defined in NFPA 70E as a source of possible injury or damage to health associated with the release of energy caused by a(n) ? .

Answer 11

electric arc

Question 12

Protective systems, such as work practices and PPE, can help to ? or ? exposure to hazards.

Answer 12

reduce/expose

Question 13

Which of the following is the best way to prevent injury from electrical hazards to the worker?

Answer 13

put the electrical equipment in an electrically safe work condition

Question 14

If workers wear arc-rated clothing and other protective equipment, they are assured of escaping electrical incidents unscathed.

Answer 14

False

Question 15

The PPE requirements of NFPA 70E Section 130.7 are intended to provide protection against physical trauma other than exposure to the thermal effects of arc flash.

Answer 15

false

Question 16

Live parts to which an employee might be exposed must be deenergized before the employee works on or near them, unless the ? can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations.

Answer 16

employer

Question 17

Voltage testing is considered energized work.

Answer 17

True

Question 18

Many factors should be considered in decisions to create a safe work environment. Which of the following considerations should be included in the development and implementation of a safety program, training, and risk assessment procedure?

I. Has an attempt been made to reduce the potential worker exposure through work practice or design considerations, such as arc-resistant switchgear or remote switching?
II. Has the impedance on the transformer on the supply side of the service changed?
III. Has the overcurrent protective device (OCPD) been maintained properly?
IV. Was the overcurrent protection selected solely to protect the equipment or was worker protection considered as well?

Answer 18

all of them

Question 19

The true cost of an electrical injury or fatality should be considered before deciding that work must be performed on energized equipment. Which of the following considerations determine the true cost of an electrical injury or fatality?

I. Which ultimately costs more: an unscheduled shutdown or a planned shutdown?
II. Can the equipment be shut down at night, over the weekend, or at some other point in time?
III. Have the costs associated with human life, equipment, loss of production, insurance premium increases, potential exclusion from bid lists, corporate image, and worker morale been considered in the decision-making process?
IV. What is the true cost if something goes wrong?

Answer 19

all of them

Question 20

An electrical hazard is defined in NFPA 70E as a dangerous condition such that ? .

Answer 20

contact or equipment failure can result in electric shock, arc flash burn, thermal burn, or blast