ELECTRICAL SAFETY-RELATED WORK PRACTICES

Tingling sensation can be expected on a 60-hertz AC circuit when the current passing through the body in milliamperes is

0.5 to 3

NFPA 70E requirements for maintenance of PPE

Shall be visually inspected for damage and defects before initial use

Number of steps to verify electrically safe work conditions

Eight

Per 29 CFR Part 1926 insulating equipment shall be 

inspected for damage before each days use and immediately after any incident that can be suspected of causing damage

Insulating gloves shall be given an ___ test, along with the inspection

air

Per Subpart I, Personal Protective Equipment, in 29 CFR Part 1910, the employers shall verify that the required workplace hazard assessment has been performed through a ______ that identifies the workplace evaluated; the person certifying that the evaluation has been performed; the date(s) of the hazard assessment; and which identifies the document as a certification of hazard assessment

written certification

Per Subpart K of 29 CFR Part 1926, equipment or circuits that are energized shall be _________ and shall have ____ attached at all points where such equipment or circuits can be energized

rendered inoperative, tags

The purpose of 70E is to provide a __ for employees relative to the hazards arising from the use of electricity

practical safe working area

“Electrical hazard” is defined as a dangerous condition that ___ can result in electric shock, arc flash burn, thermal burn, or arc blast injury

contact or equipment failure

Energized electrical conductors and circuits part 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

50 volts

Unqualified persons shall be trained in, and be familiar with, any electrical safety-related practices necessary for their safety. this training requires electrical safety training documentation and is required to contain, among other things, the content of the training, each employees name, and dates of training as well as be retained for the duration of the employee’s employment per ____

110.4(A)(5)

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 that where the possibility of induced voltages or stored electrical energy exists. In this case, ____ all circuit conductors and circuit parts before touching them

ground

What is a primary reason for following lockout/tagout procedures when working with OCPD’s

To prevent accidental energization of circuits being worked on

The typical clearing time of a molded case circuit breaker rated less than 1,000 volts for currents in the instantaneous regions is what?

1.5 Cycles

Table 130.5(C) ____ be used to estimate the likelihood of occurrence of an arc flash event to determine if additional protective measures are required

shall be permitted to

How does proper system design contribute to reducing electrical hazards?

By incorporating safety features and protective devices to mitigate hazards

The typical fault clearing time for a current-limiting fuse for currents in the current-limiting region is?

¼ Cycle

When the protection circuit breaker is not maintained, NFPA 70E requires which of the following?

None of the above

Which engineering practice is critical for enhancing electrical safety in both new systems and upgrades?

Conducting thorough risk assessment and audits

Given that all parameters are the same, how does the incident energy produced in a small enclosure differ from a large enclosure?

Small enclosures produce a higher incident energy

When establishing an electrically safe work condition, the ERMS must be placed in which position?

The ERMS is not used when establishing an electrically safe work condition

A current-limiting fuse with a trip curve that crosses 0.01 seconds at 4,000 A and an interrupting rating of 200 kA that experiences a fault current of 8,000 A will open in which of the following regions of the TCC curve?

Current-limiting region

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

To reduce severity of arc-flash events

When energized electrical conductors and circuit parts operating at voltages equal to or greater than 50 volts are not put into an electrically safe work condition, and work is performed as permitted in accordance with 110.2(B), only ____ shall be permitted to work on electrical conductors or circuit parts that have not been put into an electrically safe work condition

qualified persons

Electrical equipment such as switchboards, panel boards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling units and that are likely to require examination, adjustment, servicing, or maintenance while energized shall generally be marked with a label containing all the following information, except _____

restricted approach boundary

When selecting hand protection as arc flash protective equipment, where insulating rubber gloves are used for electric shock protection, ____ shall be worn over the rubber gloves

protectors

When the arc flash risk assessment performed in accordance with 130.5 indicates that arc flash PPE is required and the arc flash PPE category method is used for the selection of PPE for AC systems in lieu of the incident energy analysis of 130.5(G), Table 130.7(C)(15)(a) shall be used to determine the arc flash PPE category. An incident energy analysis shall be required in accordance with 130.5(G) for which of the following?

Any of the above

After a circuit is de-energized by the automatic operation of a circuit protective device, the circuit shall not be manually re-energized until a qualified person or persons determines the equipment and circuit can be safely energized. Manually reclining circuit breakers or re-energizing circuits through replaced fuses shall be _____ until the fault has been cleared

prohibited

Where work performed on equipment that is de-energized and placed in an electrically safe condition exists in a work area with other energized equipment that is similar in size, shape, and construction, one of the alerting methods in____ shall be employed to prevent the employee from entering look-alike equipment

130.8(O)

The arcing current is _____ the bolted fault current value

less than

A circuit breaker that is equipped with an energy reduction maintenance switch can impact which of the following components of risk?

Severity

A current-limiting fuse operating on arcing current in its current limiting region can impact which of the following components of risk?

Severity

The plasma that enables current to flow through the air introduces _____ causing the arcing current to be less than the bolted fault current value

impedance

How does the distance from the power source affect available fault current?

The closer to the power source, the higher the available fault current

Data critical for fault current studies related to transformers include which parameters?

kVA rating, primary and secondary voltage ratings, percent impedance

When working downstream of a circuit breaker installed in a SWITCH GEAR, which PPE Category is the lowest possible when applying the PPE Category method?

Category 4

When working downstream of a circuit breaker installed in a PANEL BOARD, which PPE category is the lowest possible when applying the PPE category method?

Category 1

What is the lowest PPE Category that can be worn for a 480-volt panel board with 23 kilo amps of fault current at the panel board and supplied from 200-amp current limiting fuse

Category 1

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

Date

How does neglecting maintenance impact electrical safety?

It increases the risk of electrical hazards

Why is regular electrical maintenance important for ensuring safety?

All of these

Which of the following best describes the relationship between incident energy and overcurrent protective device design?

Proper OCPD selection and coordination can reduce incident energy during faults