This document summarizes an electrical safety training presentation on implementing NFPA 70E standards. It discusses electrical hazards like arc flash and shock, and injuries they can cause. It reviews OSHA 1910 Subpart S electrical safety regulations and "qualified worker" definitions. NFPA 70E requirements are explained, including performing arc flash hazard analyses, using appropriate PPE based on hazard categories, implementing safety practices, and qualifying employees through training. The presentation emphasizes properly implementing electrical safety programs and standards to prevent workplace injuries and fatalities from electrical hazards.

1. Implementing NFPA
70E Electrical Safety
Standards
St Louis, MO
May 26, 2010

2. Topics
 Electrical hazards/injuries
 OSHA 1910 Subpart S
 NFPA 70E requirements
 “Qualified” Worker”?
 Electrical Safe Work Practices
 Understanding arc flash hazard categories & PPE
 Understanding approach boundaries
 Implementing 70E and qualifying employees

3. Why it’s important……
 1,213 electrical related
workplace fatalities from 2003
to 2007*
 13,150 severe injuries*
*Electrical Safety Foundation International 2008 Survey

4. Injuries from Electric Shock
 Electrocution
 Electrical burns
 Nerve, muscle, tissue
damage
 Internal bleeding
 Secondary injuries
 Falls
Muscle, nerve, and
tissue destruction
Thermal burnsBurns
Secondary
injuries
Cardiac arrest and
respiratory failure
Electrical InjuriesElectrical Injuries
© Business & Legal Reports, Inc. 0912

5. Electric Shock
 Received when current passes
through the body
 Severity of the shock depends
on:
 Path of current through the
body
 Amount of current flowing
through the body
 Length of time the body is
in the circuit
 LOW VOLTAGE
DOES NOT MEAN
LOW HAZARD Exit
Ground
Entrance

6. Electrical Safety Standards

7. OSHA Standards 29 CFR 1910

8. OSHA Standards
 1910 Subpart S – Electrical
1910.301 – .308 = Safe installation
1910.309 – .330 = Reserved
1910.331 – .335 = Work practices
1910.336 – .398 = Reserved
1910.399 – Definitions
Appendix A – Reference Documents

9. 1910.331 - Scope
 Applies to qualifed and unqualified employees
performing work on:
 Premises wiring
 Connecting to supply
 Other wiring
 Optical fiber cable
 Does NOT apply to generation, distribution, or
communication (specific standards for these)
 Refers to 1910.399 for definition of qualified
persons.

10. “Qualified Person” – OSHA 1910.399
 One who has received training in and has
demonstrated skills and knowledge in the
construction and operation of electrical
equipment and installation and the
hazards involved.

11. 1910.332 Training
 Employees who face a risk of electric
shock that is not reduced to a safe level
installation requirements must be trained.
 Occupations in Table S-4 must be trained.
 Other employees if they face a risk of
shock.

12. Table S-4
 Blue collar supervisors
 Electrical and electronic engineers
 Electrical and electronic equipment assemblers
 Electrical and electronic technicians
 Electricians
 Industrial machine operators
 Material handling equipment operators
 Mechanics and repairers
 Painters
 Riggers and roustabouts
 Stationary engineers
 Welders
 Footnote(1) Workers in these groups do not need to be trained if their work
or the work of those they supervise does not bring them or the employees
they supervise close enough to exposed parts of electric circuits operating
at 50 volts or more to ground for a hazard to exist.

13. 1910.332 Training
 Training focused on:
Recognizing live parts
Determining voltage of live parts
Clearance distances specified in 1910.333

14. 1910.333 Selection and Use of
Work Practices
 Focused on work near exposed energized
or potentially energized parts.
Locking and tagging
Deenergization
Verifying deenergized condition
Reenergizing
Overhead power lines (clearance distances)
Illumination
Several other tasks

15. 1910.333 Selection and Use of
Work Practices
 "Deenergized parts." Live parts to which an
employee may be exposed shall be deenergized
before the employee works on or near them,
unless the employer can demonstrate that
deenergizing introduces additional or increased
hazards or is infeasible due to equipment design
or operational limitations. Live parts that operate
at less than 50 volts to ground need not be
deenergized if there will be no increased
exposure to electrical burns or to explosion due
to electric arcs.

16. 1910.334 Use of Equipment
 Covers things like:
Portable equipment
Plugs and cords
Reclosing circuits
Inspection of equipment

17. 1910.335 Safeguard for Personnel
Protection
 Personal Protective Equipment
Must use when exposed
Maintenance
Inspection
 Insulated hand tools
 Guarding of exposed parts during work

18. NFPA 70E

19. Electrical Hazards
 NFPA 70E – A dangerous condition such
that contact or equipment failure can result
in:
Electric Shock
Arc flash burn
Thermal burn
Arc blast

20. Arc Flash & Arc Blast
 Arc Flash – electrical
short circuit that occurs
when air flashes from an
exposed live conductor,
to either another
conductor or to ground.
 Arc Blast – pressure
wave caused by the arc
flash.

21. Arc Flash/Blast
 Concentrated energy
explodes outward
 High intensity flash
 Temperatures can reach
35,000
 Pressure wave can reach
200lbs/sq. inch
 Vaporize conductors and
copper and explode
particles like buckshot.

22. Arc Flash Effects
 Severe burns
 Broken bones
 Vision damage
 Hearing loss
 Brain/internal injuries
 Punctures and
lacerations
 Death

23. Causes of Arc Flash
 Improper training
 Improper work procedures
 Dropped tools
 Accidental contact with electrical
systems
 Installation failure
 Inadequate SCCR
 Voltage testing with inappropriate
equipment

24. Causes of Arc Flash (cont.)
 Buildup of dust, corrosion
on insulating surfaces
 Improper maintenance
 Sparks produced during
racking of breakers,
replacement of fuses and
closing into faulty lines.
 Inattentiveness/Overconfi
dence

25. We’re in Missouri, so show me!
Racking a Breaker
Breaker Box Demonstration

26. “Qualified Person” – NFPA 70
 One who has the skill and knowledge related to
the construction and operation of the electrical
equipment and installations and has received
safety training to recognize and avoid the
hazards involved.
 May be considered qualified with respect to certain
equipment & method but still unqualified for others.

27. Qualified Persons
Training Requirements
 Understand specific electrical hazards
 Knowledgeable of the construction and
operation of the equipment
 Identify & understand the relationship between
electrical hazards and possibly injury
 Distinguish exposed live parts
 Able to determine voltage of live parts
 Understands and complies with arc flash and
shock hazard boundaries.

28. Qualified Persons
Training (cont.)
 Proper use of precautionary
techniques
 PPE, including arc-flash &
shock protection
 Insulated tools
 Demonstrate how to select
and use a voltage meter
 Decision-making process used
to determine the degree and
extent of the hazard

29. Justification for Work
NFPA 70E 130.1
 Energized electrical conductors and circuit parts to which
an employee might be exposed shall be put into an
electrically safe work condition before an employee
works within the Limited Approach Boundary of those
conductors or parts.
 Unless – the employer can demonstrate that de-
energizing introduces additional hazards or is infeasible.
 Interruption of life support systems
 Deactivation of emergency alarm systems
 Shutdown of hazardous location ventilation systems
 Circuits and conductors that operate at less than 50 volts

30. Justification for Work
NFPA 70E 130.1 (cont.)
 Other work that may be performed within
the limited approach boundary of exposed
energized electrical conductors or circuits:
Testing
Troubleshooting
Voltage measuring

31. Safe Work Practices
 De-energize-Lockout Policy
 Don’t wear conductive apparel
 Work area must be illuminated
 Never reach into blind spots
 Don’t allow conductive liquids near electrical work or
equipment
 Buddy system (over 1,000 volts, work in pairs)
 Do not defeat electrical interlocks
 Use nonconductive ladders

32. Steps to NFPA 70E Compliance
1. Have an arc hazard survey completed.
2. Implement any recommendations to
reduce the hazards.
3. Develop and implement a labeling system.
4. Determine what tasks will be performed
and at what hazard category.
5. Train (qualify) employees and provide
PPE.

33. Arc Hazard Survey
 Conducted by an engineering firm
 Survey includes:
 Single line diagram of electrical system
 Incident energy levels
 Current limiting device coordination
 Calculates a hazard risk category and approach
boundaries
 Develops recommendations to reduce high hazard
risk categories

34. Reduce the hazards!
 Some examples:
Change fuses
Develop a maintenance program
Adjust circuit breakers
Install additional disconnects

35. Arc Flash Label

36. Arc Flash Label

37. Arc Ratings
Hazard/Risk
Category
Incident Energy
(cal/cm2
)
0 0 - 1.2
1 1.2 - 4
2 4 - 8
3 8 - 25
4 25 - 40
Dangerous Over 40
*NFPA 70E Table 130.7(C)(11)

38. NFPA 70E Approach Boundaries

39. NFPA 70E Approach Boundaries
(cont.)
 The qualified
worker is
responsible
for ensuring
physical
barriers are
in place and
all approach
boundaries
are enforced
during work.
! WARNING
Arc Flash and Shock Haz ard
Appropriate PPE Required
34 inch Flash Hazard Boundary
3.46 cal/cm^2 Flash Hazard at 18 inches
Class 1
VR Gloves-Tools, Proper Clothes, Safety Glasses,
Hardhat
480 VAC Shock Hazard when cover is removed
42 inch Limited Approach
12 inch Restricted Approach
1 inch Prohibited Approach
Bus Name: PP-MCC-G81, Prot Device: PP-PDP-G71-6
ProhibitedRestrictedLimited
Flash Boundary – 4 ft. or calculated
Warning label
provides
boundary
information

40. Specific Tasks
 Troubleshooting only! NO “WORK!”
Checking / replacing fuses
Checking motor starters
Checking amp draw
Checking relays

41. Train….Train….Train….Train
 3-step process….
Controls 101
Arc Flash Hazard Training
Equipment Specific Training
 Hands on!

42. Arc Flash Hazard Training
 Labeling system
 Glove selection and testing
Shock protection
 Arc flash rated clothing
Arc flash protection

43. Glove Labeling Chart
Choose the right glove by voltage rating

44. Voltage-rated Gloves
 First line of defense
 Choose the right size
 Leather protectors must be worn over the rubber gloves
 Gloves must be tested
 Before first issue and every 6 months
 If tested, but not issued for service, glove may not be put into
service unless tested within previous 12 months.
 Checked before use
 Roll-up test
 Inflator test  Salisbury
video

45. Arc-Rated FR Clothing & PPE
 Layering
 Outer layers must be flame resistant
 Under layers must be non-melting
 Fit – Clothing shall fit properly (loose), w/ least
interference
 Coverage – Clothing must cover potentially
exposed areas (wrist, neck)
 Care & Maintenance
 Inspect before use
 Launder according to mfg’s instructions
*Photo courtesy of Salisbury

46. PPE - Hazard Risk Category 0
0-1.2 cal/cm2
 100% cotton long
sleeve shirt
 Long pants
 Safety glasses
 Hearing protection
 Leather and insulated
gloves (as required)
 Leather work boots

47. PPE - Hazard Risk Category 1
1.2 - 4 cal/cm2
 4+ cal long sleeve shirt &
long pants (or) coveralls
 Hardhat
 Safety glasses
 Arc rated faceshield
 Hearing protection (inserts)
 VR gloves
 Leather gloves
 Leather work boots

48. PPE - Hazard Risk Category 2
4 - 8 cal/cm2
 8+ cal long sleeve shirt &
long pants (or) coveralls
 Hardhat
 Safety glasses
 Arc rated faceshield
 Hearing protection (inserts)
 VR gloves
 Leather gloves
 Leather work boots

49. PPE - Hazard Risk Category 3
8 - 25 cal/cm2
 25+ flashsuit w/ hood
over long sleeve shirt and
long pants
 Safety glasses
 Arc rated faceshield
 Hearing protection
(inserts)
 VR gloves
 Leather gloves
 Leather work boots

50. PPE - Hazard Risk Category 4
25 - 40 cal/cm2
 40+ flashsuit w/ hood over FR
long sleeve shirt and long
pants
 Safety glasses
 Arc rated faceshield
 Hearing protection (inserts)
 VR gloves
 Leather gloves
 Leather work boots

51. Hands-On Training
 How to use a multi-meter
 Set up a safe scenario
Lockout upstream before class!
 Trainee performs
 Unacceptable performance = NOT qualified!

52. Qualification
 All steps completed
Survey
Calculations
PPE determination
Training
 Employees qualified