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The leaders in visual
safety.
Arc Flash
Ten Common Arc Flash
Misconceptions
&
NFPA-70E
Arc Flash & NFPA-70E
An Arc Flash can be…
Temperatures reaching 35,000 degrees can be
devastating!
That's four times hotter than the sun's surface!!!
Multiple reasons for Arc Flashes
Human Error (most common)
Negligent preventive maintenance
Improper electrical equipment/system
design
Arc Flash & NFPA-70E
So why all the confusion?
10
Arc Flash & NFPA-70E
And now - The Top Ten Misconceptions
But first, BE WARNED:
Don't fall into any ugly fallacies and
misconceptions on arc flash – play it safe!
Your life just might depend on it.
- Not so fast! There’s a reason for the concern:
According to OSHA, an electrical worker is the
third most dangerous profession
1 to 3 die every day from an arc flash incidents
Estimated 5 to 10 arc flash explosions happen
in the U.S. every day
Arc Flash & NFPA-70E
1. “Arc Flashes are so rare, why all the hype?”
Arc Flash & NFPA-70E
- Not quite, there is more to it!
Reduce live work by de-energizing a circuit first!
This puts the job in an electrically safe condition
before the work is even started
This is the best standard to go by
2. “NFPA-70E is the standard governing arc flash.”
Work permits are required for anyone working with
energized equipment over 50 volts
PPE and labeling are not enough
Employers are directly responsible for issuing
permits
3. “It’s all AFH labeled so I'm compliant with
NFPA-70E” - False! Here’s why...
Arc Flash & NFPA-70E
- Not necessarily!
Current limiting fuses only help mitigate if
the fault current is high enough
They don't address the duration
component of arc flash
Arc Flash & NFPA-70E
4. “I can reduce most AFH with current-limiting fuses”
Arc Flash & NFPA-70E
The majority of arc flash injuries occur
from human error.
Therefore, the only way to avoid danger
is through regular analysis of equipment,
work practices, and safety training.
5. “I can do regular infrared scans instead
of arc flash analysis'” – Not!
Arc Flash & NFPA-70E
The point of analysis is to reduce
hazards!
Addressing them with just PPE is
not enough
6. “Panel labeling is sufficient enough for arc
flash analysis.” No - That’s Dangerous!
Arc Flash Analysis
Software is available at:
www.CreativeSafetySupply.com
MCC is the final access point
of power for motor loads
However, that doesn't mean
other loads don't possess a
possible AFH or threat
Arc Flash & NFPA-70E
7. Beyond the Motor Control Center (MCC), it
isn't necessary to check equipment for AFH
Arc Flash & NFPA-70E
IEEE 1584 states, "Equipment below 240 V
need not be considered unless it involves at
least one 125 kVA or larger low-impedance
transformer in its immediate power supply.”
But, here is the catch...
8. If equipment is under 240 volts, I don't need to
access it through a transformer rated below 125 kVA
Arc Flash & NFPA-70E
This only refers to incident energy calculations
Employers are responsible for assessing all
equipment operating at 50 volts and higher
Low voltage does not mean there is no threat
of danger, fire, or electrocution
8. (continued)
The probability is really low, but... Once you start to
insert or remove draw-out circuit breakers, bus
plugs and MCC buckets the risk goes up.
This can create a hazard where a once perceived
hazard-free zone existed - Proceed with Caution!
Arc Flash & NFPA-70E
10. If there's no exposed, energized conductors, or
circuit parts, then there's no AFH - Close but no cigar
We have you covered.
Creative Safety Supply works with companies both
large and small to help them with their
Arc Flash Labeling, Software and Signage needs.
We also carry a host of PDCA, Lean, 5S, 6S Kaizen, Kanban and
Continuous Improvement products. CreativeSafetySupply.com.
Arc Flash & NFPA-70E
www.CreativeSafetySupply.com
1-866-777-1360
call us toll-free:
or visit us online at:
The leaders in visual safety

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Arc Flash and NFPA-70E Misconceptions

  • 1. The leaders in visual safety. Arc Flash Ten Common Arc Flash Misconceptions & NFPA-70E
  • 2. Arc Flash & NFPA-70E An Arc Flash can be… Temperatures reaching 35,000 degrees can be devastating! That's four times hotter than the sun's surface!!!
  • 3. Multiple reasons for Arc Flashes Human Error (most common) Negligent preventive maintenance Improper electrical equipment/system design Arc Flash & NFPA-70E So why all the confusion?
  • 4. 10 Arc Flash & NFPA-70E And now - The Top Ten Misconceptions But first, BE WARNED: Don't fall into any ugly fallacies and misconceptions on arc flash – play it safe! Your life just might depend on it.
  • 5. - Not so fast! There’s a reason for the concern: According to OSHA, an electrical worker is the third most dangerous profession 1 to 3 die every day from an arc flash incidents Estimated 5 to 10 arc flash explosions happen in the U.S. every day Arc Flash & NFPA-70E 1. “Arc Flashes are so rare, why all the hype?”
  • 6. Arc Flash & NFPA-70E - Not quite, there is more to it! Reduce live work by de-energizing a circuit first! This puts the job in an electrically safe condition before the work is even started This is the best standard to go by 2. “NFPA-70E is the standard governing arc flash.”
  • 7. Work permits are required for anyone working with energized equipment over 50 volts PPE and labeling are not enough Employers are directly responsible for issuing permits 3. “It’s all AFH labeled so I'm compliant with NFPA-70E” - False! Here’s why... Arc Flash & NFPA-70E
  • 8. - Not necessarily! Current limiting fuses only help mitigate if the fault current is high enough They don't address the duration component of arc flash Arc Flash & NFPA-70E 4. “I can reduce most AFH with current-limiting fuses”
  • 9. Arc Flash & NFPA-70E The majority of arc flash injuries occur from human error. Therefore, the only way to avoid danger is through regular analysis of equipment, work practices, and safety training. 5. “I can do regular infrared scans instead of arc flash analysis'” – Not!
  • 10. Arc Flash & NFPA-70E The point of analysis is to reduce hazards! Addressing them with just PPE is not enough 6. “Panel labeling is sufficient enough for arc flash analysis.” No - That’s Dangerous! Arc Flash Analysis Software is available at: www.CreativeSafetySupply.com
  • 11. MCC is the final access point of power for motor loads However, that doesn't mean other loads don't possess a possible AFH or threat Arc Flash & NFPA-70E 7. Beyond the Motor Control Center (MCC), it isn't necessary to check equipment for AFH
  • 12. Arc Flash & NFPA-70E IEEE 1584 states, "Equipment below 240 V need not be considered unless it involves at least one 125 kVA or larger low-impedance transformer in its immediate power supply.” But, here is the catch... 8. If equipment is under 240 volts, I don't need to access it through a transformer rated below 125 kVA
  • 13. Arc Flash & NFPA-70E This only refers to incident energy calculations Employers are responsible for assessing all equipment operating at 50 volts and higher Low voltage does not mean there is no threat of danger, fire, or electrocution 8. (continued)
  • 14. The probability is really low, but... Once you start to insert or remove draw-out circuit breakers, bus plugs and MCC buckets the risk goes up. This can create a hazard where a once perceived hazard-free zone existed - Proceed with Caution! Arc Flash & NFPA-70E 10. If there's no exposed, energized conductors, or circuit parts, then there's no AFH - Close but no cigar
  • 15. We have you covered. Creative Safety Supply works with companies both large and small to help them with their Arc Flash Labeling, Software and Signage needs. We also carry a host of PDCA, Lean, 5S, 6S Kaizen, Kanban and Continuous Improvement products. CreativeSafetySupply.com. Arc Flash & NFPA-70E
  • 16. www.CreativeSafetySupply.com 1-866-777-1360 call us toll-free: or visit us online at: The leaders in visual safety