Arc Flash NFPA 70E 3
Summary
TLDRThe video script discusses the importance of proper Personal Protective Equipment (PPE) in preventing injuries from arc flashes and electrical hazards. It highlights the flammability and melting risks of various fabrics, emphasizing the need for non-melting materials in undergarments. The script also covers the use of arc-rated balaclavas, the placement of barriers and barricades, and the role of attendants in safety. It underscores the significance of incident energy in selecting PPE and the necessity for a qualified person to have the right skills and knowledge for electrical work safety.
Takeaways
- 🔥 Many fabrics, including cotton, polyester, and blends, are flammable and can continue to burn, posing a risk of serious injuries.
- 🌡 Synthetic materials like nylon, polyester, polypropylene, and spandex can melt during an arc flash, potentially aggravating burn injuries.
- 👚 Properly rated Personal Protective Equipment (PPE) is essential to limit the thermal energy exposure to a safe level, but it may not prevent undergarments from melting onto the skin.
- 🧥 Undergarments must be made of non-melting material to avoid additional injury from melted fabrics.
- 🎭 Arc-rated balaclavas, such as balaclava sock hoods, are designed to protect the neck and head, excluding the face, and should fit tightly with minimal air pockets.
- ⚠️ A barricade is a physical obstruction intended to provide a warning and limit access to hazardous areas, and it should be installed according to specific safety guidelines.
- 🚷 The placement of barriers and barricades is crucial for safety and is often the duty of workers performing tasks in proximity to electrical hazards.
- 👷♂️ Attendants are responsible for manual signaling and alerting to keep unqualified employees away from areas with electrical hazards.
- 🔢 Incident energy, measured in calories per square centimeter, is a critical factor in selecting appropriate PPE to prevent injury from electrical arcs.
- 🛡 PPE rated above the calculated incident energy value increases the likelihood of protecting employees from the thermal effects of an arc flash.
- 🏢 A qualified person is one with demonstrated skills and knowledge related to electrical equipment operations and has received safety training to identify and reduce hazards.
- 📚 Continuing education and demonstration of necessary skills are required to maintain the skill level for working safely with electrical equipment.
Q & A
Why are certain fabrics like cotton, polyester, and wool considered hazardous in the context of arc flash incidents?
-These fabrics are flammable and can continue to burn, which can lead to serious injuries due to their tendency to melt onto the skin, exacerbating burn injuries.
What is the role of properly rated Personal Protective Equipment (PPE) in preventing injuries from arc flash?
-Properly rated PPE should limit the thermal energy level and pinch on the employee's body to one that does not cause worse than second-degree burns, although it may not prevent the melting of undergarments.
Why is it essential for undergarments to be made of non-melting material in arc flash scenarios?
-Undergarments made of non-melting material are crucial to prevent them from melting onto the employee's skin, which can cause additional severe burns.
What is an arc-rated balaclava, and how does it protect against arc flash?
-An arc-rated balaclava is a head and neck covering that is tested and rated for arc flash protection. It fits tightly against the skin with minimal air pockets, providing protection to the neck and head except for the facial areas of the eyes and nose.
Why is it not advisable to wear a balaclava for warmth as arc flash protection?
-A balaclava intended for warmth may not have the necessary arc rating and may not meet the requirements of NFPA 70E, thus failing to provide adequate protection during an arc flash event.
What is the purpose of a barricade in electrical safety?
-A barricade serves as a physical obstruction and warning device to limit access to areas with electrical hazards, ensuring that only qualified personnel can approach.
How should the placement of barriers and barricades be determined during electrical work?
-The placement should be determined by maintaining the limited approach boundary distance or ensuring that energized conductors or circuit parts are de-energized and safe to approach.
What is the role of an attendant in providing manual signaling and alerting during electrical work?
-The attendant's primary duty is to keep unqualified employees outside the work area where they might be exposed to electrical hazards, ensuring that only those qualified are present.
What is incident energy, and why is it important in selecting appropriate PPE?
-Incident energy is the amount of thermal energy impressed on a surface during an electrical arc event, typically expressed in calories per square centimeter. It is crucial for selecting PPE rated above the calculated incident energy value to ensure protection.
What qualifies a person as a 'qualified person' in the context of NFPA 70E?
-A qualified person is one who has demonstrated skills and knowledge related to the construction operations of electrical equipment and installations, has received safety training to identify hazards, and reduce associated risks.
Why is continuing education and demonstration of necessary skills important for maintaining the requisite skill level to work safely?
-Continuing education and skill demonstration are important to ensure that employees remain up-to-date with safety practices and can work safely on electrical equipment, as the nature of electrical work requires ongoing learning and skill development.
Outlines
🔥 Fire Hazards of Fabrics and PPE Importance
This paragraph discusses the flammability of various fabrics like cotton, polyester, and wool, which can lead to serious injuries from burns. It emphasizes the importance of properly rated Personal Protective Equipment (PPE) to limit the thermal energy exposure to employees. The text also highlights the risks of synthetic materials like nylon and polyester that can melt and cause additional injuries during arc flash exposure. The role of undergarments made from non-melting materials is stressed, as well as the necessity of arc-rated balaclavas for head and neck protection. The paragraph also touches on the use of barricades and attendants to ensure safety from electrical hazards, and the concept of incident energy in arc flash events, which is crucial for selecting the right PPE.
Mindmap
Keywords
💡Flammable fabrics
💡Arc flash
💡PPE (Personal Protective Equipment)
💡Thermal energy
💡Undergarments
💡Balaclava
💡Arc rating
💡Barriers and barricades
💡Limited approach boundary
💡Attendant
💡Incident energy
💡Qualified person
Highlights
Various fabrics including naan are flammable and can continue to burn, leading to serious injuries.
Synthetic materials like nylon, polyester, and spandex can melt into the skin from arc flash exposure, aggravating burn injuries.
Properly rated PPE should limit thermal energy levels to prevent worse than second-degree burns.
Undergarments must be made of non-melting material to prevent melting onto the employee's skin.
Balaclava sock hoods are arc-rated and protect the neck and head except for the facial areas.
Balaclava must have a tested arc rating and should not be worn solely for warmth.
A barricade is a physical obstruction intended to provide a warning and limit access.
Barriers should not be installed closer than the limited approach boundary distance.
The placement of barriers and barricades is often the duty of the person performing the task.
Attendants must keep unqualified employees outside of work areas where they might be exposed to electrical hazards.
Incident energy is the amount of thermal energy impressed on a surface during an electrical arc event.
Predicting the amount of available incident energy is crucial for selecting appropriate PPE.
A qualified person demonstrates skills and knowledge related to electrical equipment and installations.
Continuing education and demonstration of necessary skills are required to maintain the requisite skill level for safe work.
Licensing alone does not make a person qualified under NFPA 70e for all tasks or equipment.
Electricians may be qualified for installation but not maintenance of the same equipment.
Transcripts
many fabrics including naan are created
cotton polyester cotton blends nylon
silk and wool fabrics are flammable and
can a night and continue to burn
resulting in serious injuries
furthermore non are crated synthetic
materials such as nylon polyester
polypropylene and spandex can melt into
the skin from an arc flash exposure
aggravating the burn injury significant
injuries can occur when fabrics melt
onto an employee skin our graded PPE
does not necessarily prevent the passage
of thermal energy to the employee
however properly rated PPE should limit
thermal energy level and pinch on the
employees body to one that does not
cause worse than a second to reborn'
this energy level may be sufficient to
melt undergarments onto the employee
skin therefore undergarments must be
made of non melting material an incident
quantity of these fabrics such as those
and the elastic bands and underwear is
permitted a balaclava sock hood is an
arc rated that protects the neck and
head except for the facial areas of the
eyes and nose it fits tightly against
the words head and neck and few air
pockets exist between the balaclava and
the wearer skin only balaclava is having
a tested Park rating and calories can be
used to meet the requirements of the
NFPA 70e balaclava antenna for warmth
must not be worn as our flash protection
this picture shows a balaclava sock hood
with an arc that remote performance
value rating of 28 calories a barricade
is a physical obstructions such as tapes
cones or a frame type water metal
structures intended to provide a warning
and to limit access a barricade might
consist of warning tape and cones as
shown as this picture physical or
mechanical field fabricated barriers
shall be installed no closer than a
limited approach boundary distance while
the barrier is being installed the
limited approach boundary distance shall
be maintained or the energized
conductors or circuit parts shall be
placed intellectually safe work
condition the placement of barriers and
barricades will often be your duty as
part of the performing task the limited
approach boundary distance will not be
found on an equipment label it should be
on the Energizer or permit if the task
does not require work permit you must be
capable of determining the distance from
the appropriate table barricades are not
intended to prevent approach to an area
instead
a barricade is intended to act as a
warning device when installed the
barricade should enclose the area
containing the electrical hazard if
signs and barricades do not provide
sufficient warning and protection from
electrical hazards antennas shall be
stationed to warn and protect employees
the primary duty responsibilities of an
attendant providing manual signaling and
alerting shall be to keep unqualified
employees outside of the work area where
the unqualified employee might be
exposed to electrical hazards the
attendant should have no other duty than
to deliver the warning incident energy
is the amount of thermal energy
impressed on a surface a certain
distance from the source generated
during electrical arc event in state
energy is typically expressed in
calories per square centimeter
predicting the amount of available
incident energy is crucial in selecting
appropriate PPE properly rated PPE
prevents injury from melting or burning
clothing or from direct skin exposure
due to the increased temperature Darren
are cleaning fault
using PVD rated above the calculated
incident energy value can raise the
probability of the employee being
protected a qualified person is one who
has demonstrated skills and knowledge
related to the construction operations
of electrical equipment and
installations and has received safety
trained to identify the hazards and
reduce the associated risk a qualified
employee must understand the
construction and operation of the
equipment or circuit associated with the
planned work tasks an employee could be
qualified to perform one more task and
all not be qualified to perform a
different work task on that same piece
of equipment an employee could also be
qualified to work on one piece of
equipment but not another similar piece
of equipment many states and local
government licensing programs have
training requirements that must be met
for a person to be considered qualified
the applicant must be examined initially
and then periodically after procuring a
license the license in and of itself
does not make a person qualified under
the requirements of the NFPA 70e for all
tasks or equipment that may be
encountered for example often the
licensing of electricians qualifies them
for installing electrical equipment in
accordance with the NEC but may not
qualify them to maintain the same piece
of equipment the electrical work
requires continuing education and
demonstration of the necessary skills in
order to maintain the requisite skill
level to work safely
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