Arc Flash Overview
Assess your arc flash knowledge by answering the questions in the Quiz Group below.
How many arc flashes are estimated to happen every day in the U. S.?
Which of the following are causes of arc flash events?
a. Faulty equipment design.
b. Failure to de-energize equipment when possible.
c. Poor maintenance of equipment.
d. Dropped tools or conductive objects onto live circuits.
e. Conductive dust or moisture introduced into live system.
It is unnecessary for qualified personnel to be specifically trained to work on energized conductors or circuit parts when crossing into a 'Restrictive Approach Boundary'.
OSHA, the Occupational Safety and Health Administration, the government agency that regulates worker safety recognizes the NFPA 70E®, Standard for Electrical Safety Requirements for Employee Workplaces®, as the industry standard.
Which of the following is not considered one of the three factors that determine how severe an arc flash injury will be:
a. How close the person is to the arc flash/blast hazard.
b. The temperature of the event.
c. The length of time exposed to the event (before the circuit is disconnected).
d. The type of equipment of the arc flash event.
As described in this lesson, the 'Limited Approach Boundary' for the 2015 standard __________.
a. is the minimum approach to an exposed energized conductor.
b. is the distance from an exposed energized conductor that could lead to a curable burn.
c. is the limit of approach distance for an unescorted, unqualified persons to a live part.
d. should never be crossed by an unqualified person.
Wearing Personal Protection Equipment (PPE) is a requirement for personnel performing work or checks on live exposed conductors.
A 2015 category 4 PPE includes anything with an arc rating of __________.
a. 4 to 8 cal/cm²
b. 8 to 25 cal/cm²
c. 25 to 40 cal/cm²
d. minimum 40 cal/cm²
Generally, arc flash and fire resistant clothing can be maintained and laundered the same way as regular work clothes.
Before working on electrical equipment it is mandatory, except under special circumstances, to establish a safe working condition by __________.
a. shutting down the equipment off at the control panel
b. performing a lockout/tagout (LOTO) and verification procedure
c. shutting off the circuit components being worked on
d. using the correct level of PPE and being careful
When servicing the AMTEC Integrated Manufacturing System Simulator (AIMSS), the equipment is completely de-energized when the main electrical disconnect switch is in the OFF position.
The Arc Flash Protection boundary in the AMTEC Integrated Manufacturing System Simulator (AIMSS) example is _____.
a. 12 inches
b. 24 inches
c. 36 inches
d. 48 inches
What is the proper level of PPE required to work in the Restrictive Approach Boundary area for the AMTEC Integrated Manufacturing System Simulator (AIMSS) based on the arc flash label example.
a. PPE Category 0
b. PPE Category 1
c. PPE Category 2
d. PPE Category 3
e. PPE Category 4
What is the first step to establishing an electrically safe working condition on the AMTEC Integrated Manufacturing System Simulator (AIMSS)?
a. Turning off and locking out the main electrical disconnect switch.
b. Donning the appropriate PPE.
c. Notifying all affective personnel of impending shut-down, de-energizing and lockout.
d. Shut off the equipment upstream of the main electrical disconnect switch.
It is required to verify the AMTEC Integrated Manufacturing System Simulator (AIMSS) for the presence of voltage once de-energized.
It is only required to verify the testing instrument (volt meter) prior to using on the AMTEC Integrated Manufacturing System Simulator (AIMSS) for the presence of voltage once de-energized.
If the power is locked out downstream of the AIMSS main electrical disconnect such as the robot controller lockout point, the robot system is completely de-energized.
Which of the following are considered safe working practices when working around the AMTEC Integrated Manufacturing System Simulator (AIMSS)?
a. Always follow proper ECPL procedures.
b. Be familiar with the work area and associated hazards.
c. Look for damaged or worn electrical components.
d. Listen for Buzzing or crackling sounds.
e. Feel for abnormal heat or smell burning or hot odor.
f. Watch for open panels, wet areas, poor housekeeping.
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Date last modified: October 29, 2015.
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