NFPA 70E Arc Flash Hazard Analysis
60 flashcards covering NFPA 70E Arc Flash Hazard Analysis for the OSHA Electrical Safety / NFPA 70E section.
NFPA 70E Arc Flash Hazard Analysis addresses the methods for assessing potential arc flash incidents in electrical systems, including risk evaluation, boundary determination, and protective measures to prevent injuries. This is defined by the NFPA 70E standard, a key guideline from the National Fire Protection Association that OSHA incorporates into its outreach training for construction and general industry, ensuring compliance with electrical safety regulations.
On OSHA Outreach Training exams, this topic typically features in multiple-choice or scenario-based questions that test understanding of hazard analysis steps, such as calculating incident energy levels or identifying required personal protective equipment. Common traps include mistaking arc flash boundaries for shock hazard distances or neglecting to account for system changes that could alter risks.
One practical pitfall workers often overlook is regularly updating arc flash labels based on equipment modifications.
Terms (60)
- 01
What is an arc flash hazard under NFPA 70E?
An arc flash hazard is a dangerous release of energy caused by an electric arc, which can cause burns and other injuries. (NFPA 70E, Article 130)
- 02
Under NFPA 70E, what must be performed to assess arc flash hazards?
An arc flash risk assessment must be conducted to identify hazards and determine safe work practices. (NFPA 70E, Article 110)
- 03
How is the arc flash boundary defined in NFPA 70E?
As the distance from exposed energized parts where incident energy equals 1.2 cal/cm², requiring specific approach distances. (NFPA 70E, Article 130.5)
- 04
What factors are considered in an arc flash hazard analysis per NFPA 70E?
Available short-circuit current, fault clearing time, distance from the arc, and configuration of equipment. (NFPA 70E, Article 130.3)
- 05
Under NFPA 70E, when should an arc flash risk assessment be updated?
When changes occur in the electrical distribution system that could affect the risk, or at intervals not exceeding 5 years. (NFPA 70E, Article 130.5)
- 06
What PPE is required based on arc flash hazard analysis in NFPA 70E?
PPE must be selected to protect against the calculated incident energy level at the working distance. (NFPA 70E, Article 130.7)
- 07
In NFPA 70E, what is the first step in conducting an arc flash hazard analysis?
Perform an arc flash risk assessment to identify potential hazards associated with the task. (NFPA 70E, Article 110.5)
- 08
Under NFPA 70E, what documentation is needed for arc flash hazard analysis?
Written results of the analysis, including arc flash boundaries and required PPE, must be available at the job site. (NFPA 70E, Article 130.5)
- 09
How often must electrical equipment be labeled with arc flash information per NFPA 70E?
At intervals not exceeding 5 years or when modifications occur that could affect the arc flash hazards. (NFPA 70E, Article 130.5)
- 10
What is the limited approach boundary in the context of arc flash hazards under NFPA 70E?
A distance from exposed energized parts that an unqualified person may not cross without supervision. (NFPA 70E, Article 130.4)
- 11
Under NFPA 70E, what must workers do before entering the arc flash boundary?
Wear appropriate PPE as determined by the arc flash risk assessment. (NFPA 70E, Article 130.5)
- 12
What is incident energy in arc flash hazard analysis according to NFPA 70E?
The amount of thermal energy impressed on a surface at a certain distance from the arc, used to select PPE. (NFPA 70E, Article 130.5)
- 13
In a scenario where equipment is energized, what must be done under NFPA 70E?
Conduct an arc flash risk assessment to determine if de-energizing is feasible; if not, use energized work practices. (NFPA 70E, Article 130.2)
- 14
Under NFPA 70E, what training is required for workers exposed to arc flash hazards?
Employees must be trained to understand the hazards and use appropriate safe work practices. (NFPA 70E, Article 110.2)
- 15
What is the restricted approach boundary as per NFPA 70E?
A distance from exposed energized parts that requires qualified persons to use additional precautions. (NFPA 70E, Article 130.4)
- 16
How does NFPA 70E address arc flash hazards for maintenance tasks?
Requires an arc flash risk assessment to be performed before starting work on or near energized parts. (NFPA 70E, Article 130.3)
- 17
In NFPA 70E, what must be included in an energized electrical work permit?
Justification for working energized, results of the arc flash hazard analysis, and required PPE. (NFPA 70E, Article 130.2)
- 18
Under NFPA 70E, what is required if arc flash hazards are present during troubleshooting?
Perform an arc flash risk assessment and implement controls before proceeding. (NFPA 70E, Article 130.3)
- 19
What procedure must follow an arc flash incident per NFPA 70E?
Investigate the incident, review the arc flash hazard analysis, and implement corrective actions. (NFPA 70E, Article 110.5)
- 20
A worker notices damaged electrical equipment — what should they do under NFPA 70E?
Stop work, assess for arc flash hazards, and consult with a qualified person before proceeding. (NFPA 70E, Article 130.3)
- 21
Under NFPA 70E, how is the flash protection boundary calculated?
Based on the incident energy at the boundary, using formulas or tables from the standard. (NFPA 70E, Article 130.5)
- 22
What is the role of a qualified person in arc flash hazard analysis per NFPA 70E?
To perform the analysis and ensure safe work practices are followed. (NFPA 70E, Article 110.2)
- 23
In NFPA 70E, what engineering controls are recommended for arc flash hazards?
Use of current-limiting devices and arc-resistant equipment to reduce incident energy. (NFPA 70E, Article 130.3)
- 24
Under NFPA 70E, what must be done before removing covers on energized equipment?
Conduct an arc flash risk assessment to determine hazards and necessary precautions. (NFPA 70E, Article 130.2)
- 25
What is the minimum arc rating for PPE in arc flash scenarios per NFPA 70E?
Must be at least equal to the incident energy exposure for the task. (NFPA 70E, Article 130.7)
- 26
A team is working on live circuits — what NFPA 70E requirement applies?
An arc flash hazard analysis must be completed, and workers must use specified PPE. (NFPA 70E, Article 130.5)
- 27
Under NFPA 70E, how should arc flash labels be formatted?
Include arc flash boundary, incident energy, and required PPE. (NFPA 70E, Article 130.5)
- 28
What steps are involved in de-energizing equipment under NFPA 70E?
Follow lockout/tagout procedures and verify absence of voltage before work. (NFPA 70E, Article 120)
- 29
In NFPA 70E, what audit is required for electrical safety programs?
Periodic audits to ensure the arc flash hazard analysis is up to date. (NFPA 70E, Article 110.5)
- 30
Under NFPA 70E, what risk assessment method can be used for arc flash?
The standard provides tables, calculations, or software for determining hazards. (NFPA 70E, Article 130.3)
- 31
What is the primary goal of arc flash hazard analysis in NFPA 70E?
To protect employees from thermal burns and other injuries from electric arcs. (NFPA 70E, Article 130)
- 32
Before entering a restricted area, what must a worker verify under NFPA 70E?
That the arc flash risk assessment has been performed and PPE is worn. (NFPA 70E, Article 130.4)
- 33
Under NFPA 70E, how are arc flash hazards mitigated?
Through engineering controls, administrative controls, and use of PPE. (NFPA 70E, Article 130.3)
- 34
What training elements are covered for arc flash in NFPA 70E?
Recognition of hazards, selection of PPE, and emergency procedures. (NFPA 70E, Article 110.2)
- 35
In a scenario with unknown arc flash risks, what action is required by NFPA 70E?
Perform an arc flash risk assessment before any work begins. (NFPA 70E, Article 110.5)
- 36
Under NFPA 70E, what voltage levels require an arc flash analysis?
For systems over 50 volts where exposure to energized parts is possible. (NFPA 70E, Article 130.3)
- 37
What is the arc flash PPE category system in NFPA 70E?
A method to select PPE based on hazard/risk categories from the analysis. (NFPA 70E, Article 130.7)
- 38
How does NFPA 70E define safe work practices for arc flash?
Practices that minimize exposure, such as maintaining distances and using insulated tools. (NFPA 70E, Article 130.2)
- 39
Under NFPA 70E, what must be in place for contractors working on electrical systems?
They must follow the host employer's arc flash hazard analysis and procedures. (NFPA 70E, Article 110.1)
- 40
A worker encounters an unexpected energized part — what should they do per NFPA 70E?
Immediately retreat, reassess risks, and perform a new arc flash analysis if needed. (NFPA 70E, Article 130.3)
- 41
What calculations are used in arc flash hazard analysis per NFPA 70E?
Incident energy calculations based on bolted fault current and clearing times. (NFPA 70E, Article 130.5)
- 42
Under NFPA 70E, who is responsible for the arc flash program?
The employer must establish, implement, and maintain an electrical safety program. (NFPA 70E, Article 110.1)
- 43
What is the prohibited approach boundary in NFPA 70E?
The distance within which contact with exposed energized parts is possible. (NFPA 70E, Article 130.4)
- 44
In NFPA 70E, how is voltage verified after de-energizing?
Using properly rated voltage detection devices before starting work. (NFPA 70E, Article 120)
- 45
Under NFPA 70E, what emergency response is required for arc flash events?
Establish procedures for medical treatment and incident investigation. (NFPA 70E, Article 110.5)
- 46
What arc flash risk factors must be evaluated in NFPA 70E?
The condition of equipment and the likelihood of human error. (NFPA 70E, Article 130.3)
- 47
A maintenance team finds high fault currents — what NFPA 70E step follows?
Update the arc flash hazard analysis to reflect the increased risks. (NFPA 70E, Article 130.5)
- 48
Under NFPA 70E, what labeling is mandatory for arc flash hazards?
Equipment must be marked with the highest incident energy and arc flash boundary. (NFPA 70E, Article 130.5)
- 49
What is the hierarchy of controls for arc flash hazards in NFPA 70E?
Elimination, substitution, engineering controls, administrative controls, and PPE. (NFPA 70E, Article 130.3)
- 50
In NFPA 70E, how are arc flash boundaries communicated?
Through labels on equipment and in the hazard analysis documentation. (NFPA 70E, Article 130.5)
- 51
Under NFPA 70E, what audit frequency is recommended for safety programs?
At least annually or when changes occur. (NFPA 70E, Article 110.5)
- 52
What PPE inspection is required before arc flash work per NFPA 70E?
Inspect PPE for damage and ensure it meets the required arc rating. (NFPA 70E, Article 130.7)
- 53
A worker must perform live work — what NFPA 70E condition must be met?
An energized work permit and arc flash risk assessment must be in place. (NFPA 70E, Article 130.2)
- 54
Under NFPA 70E, what records must be kept for arc flash analyses?
Documentation of the analysis, including dates and revisions. (NFPA 70E, Article 130.5)
- 55
What is the definition of arc-rated clothing in NFPA 70E?
Clothing that has been tested to withstand a specific level of arc flash energy. (NFPA 70E, Article 130.7)
- 56
In a high-risk arc flash scenario, what administrative control is used under NFPA 70E?
Job briefing and planning to minimize exposure time. (NFPA 70E, Article 130.3)
- 57
Under NFPA 70E, how is incident energy estimated?
Using equations or software based on system parameters. (NFPA 70E, Article 130.5)
- 58
What is the key outcome of an arc flash hazard analysis per NFPA 70E?
Determination of safe distances and required protective measures. (NFPA 70E, Article 130.3)
- 59
Under NFPA 70E, what must be done if PPE is inadequate for arc flash risks?
Revise the hazard analysis or implement additional controls. (NFPA 70E, Article 130.7)
- 60
In NFPA 70E, what role do safety-related work practices play in arc flash?
They ensure workers follow procedures to avoid ignition of arcs. (NFPA 70E, Article 110.6)