Transcript Electrical Safety for Electricians and Linemen

www.cwtc-tx.com
Construction Workforce Training
Center
5308 Andrews highway
Odessa, Texas 79762
Office: 432 – 366 - 7676
Cell:
432 – 967 - 4280
Disclaimer
Construction Workforce Training Center and Dan Dudley will
not be responsible for the interpretation or application of any electrical
work in any form by any person, company, agency or organization.
The views expressed in this class are personal views and shall not be
considered as a “Formal Interpretation”.
This training class is intended solely to focus attention and awareness
on the potential electrical safety issues and various methods to address
those hazards. The selection of any particular method is the
responsibility of the entity or person selecting the method and any
questions should be addressed to the appropriate agency or authority.
The National Electrical Code®, NEC®, NFPA®, NESC® are Registered
Trademarks of the National Fire Protection Association, Quincy, MA.
OSHA is the Occupational Safety and Health Administration. This
course quotes OSHA regulations however OSHA is in no way associated
with this class.
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Licensed Texas Master Electrician TX # 18163
Licensed Unlimited Journeyman Electrician Oklahoma # 104898
Over 20 years electrical construction experience
Over 12 years teaching electrical courses
Craft Training Director / Lead Electrical Instructor
TDLR Licensed Continuing Education Provider
Electrical Safety Instructor (NEC, NESC, NFPA70E, OSHA)
Electrical Exam Preparation Instructor
Author of NEER National Electrical Exam Review Software
Author and Instructor of Continuing Education Course material
for 18 states
• Author and Instructor of 18 hour Electrical Exam Preparation
training class approved for 18 hours CE credit in 17 states
• Director / Lead Electrical Instructor for CWTC, Odessa, TX
a US Dept of Labor and Veterans Admin registered 4 year
Electrical Apprenticeship training program.
TDLR – Texas Department of Licensing & Regulation
NCCER Certified:
• Master Trainer (Instructor Trainer)
• Assessment Administrator (DOT,OQ, and CRAFT)
• Commercial Electrician
• Industrial Electrician
• Instrument Technician
• Electrical instructor
• Pipeline Electrical & instrumentation instructor
• Project Management Instructor
• Project Supervision Instructor
•
Owner Dan Dudley & Associates
• Electrical Exam Preparation Training and Software
• Electrical Safety Training and Performance Evaluations
• Electrical Continuing Education for License Renewal
•
Electrical Continuing Education for License Renewal
• Texas, Kentucky, Oklahoma, New Mexico, Utah
• Ohio, Wyoming, Colorado, Oregon, Montana
• Washington, Minnesota, North Carolina, North Dakota
• Iowa, Idaho, Montana, Nebraska
NCCER – National Center for Construction Education and Research
•According to burn
centers, if your age
and the percentage of
burns over your body
is equal to or greater
than 100 your odds of
survival are less than
5%
•Very PAINFULLY
curable
•NOT
CURABLE
Electrical Hazards
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Shock
Electrocution
Fire
Arc flash
Arc blast
Static
Electricity
Example of an arcing fault
Electrical 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
Electric Arc
35,000 °F
Molten Metal
Pressure Waves
Sound Waves
Shrapnel
Copper Vapor:
Solid to Vapor
Expands by
67,000 times
Hot Air-Rapid Expansion
Intense Light
Limited Approach Boundary
Nearest an UNQUALIFIED
Person can approach
Restricted Approach Boundary
Must be a QUALIFIED PERSON
hat understands the hazards
Prohibited Approach Boundary
Same as contacting ENERGIZED
onductors
Based upon Arc Flash Potential
• Flash Protection Boundary
• Based upon the distance at which a 1.2cal
(2nd degree) burn could be received
• Defined as “An approach limit at a distance
from exposed live parts within which a person
could receive a 2nd degree burn if an
electrical arc flash were to occur”.
• This is NOT THE SAFE BOUNDARY
Limits of Approach – Limited
Approach Boundary
Prohibited
Restricted
Limited
Energized
panel
(<750V)
3 feet 6 inches for 480V
The closest
distance an
“unqualified”
person can
approach, unless
escorted by a
“qualified” person.
Limits of Approach – Restricted
Approach Boundary
Prohibited
Energized
part
Restricted
12 inches for
480 volts
The closest distance to
exposed live parts a
“qualified” person can
approach w/out proper
PPE and tools.
To cross this boundary,
the qualified person
must wear PPE and
have proper tools.
Limits of Approach - Shock
Prohibited
Energized
part
1 inch for
480 volts
Crossed ONLY by a “qualified”
person, which when crossed by
body part or object, requires the
same protection as if direct
contact was made with the live
part.
Limits of Approach – Flash
Protection Boundary
Prohibited Restricted
Limited
Flash
Protection
Boundary
•The distance from exposed
live parts within which a
person could receive a
second degree burn if an
arc flash were to occur.
•Arc flash PPE is required
within this boundary.
Energized
part
•Note: Distance may be
less than or greater than
the shock protection
boundaries.
Calculated distance
240 Volts and Less
277 – 600 volts Other Equipment
Electrical PPE for Arc
Flash and Arc Blast
Hazard Risk
Category 0
Hazard Risk
Category 1
Hazard Risk
Category 2
Hazard Risk
Category 3 & 4
Flash hazard analysis and NEC 110.16
arc-flash label
NEC® 2008 - 110.16 Flash Protection
Electrical equipment, such as switchboards, panelboards, industrial
control panels, meter socket enclosures, and motor control centers,
that are in other than dwelling occupancies, and are likely to require
examination, adjustment, servicing, or maintenance while energized
shall be field marked to warn qualified persons of potential
electric arc flash hazards. The marking shall be located so as to be
clearly visible to qualified persons before examination, adjustment,
servicing, or maintenance of the equipment.
•FPN No. 1: NFPA 70E-2004, Standard for Electrical Safety in the Workplace, provides assistance
in determining severity of potential exposure, planning safe work practices, and selecting personal
protective equipment.
•FPN No. 2: ANSI Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the
design of safety signs and labels for application to products.
NEC 110.16 ARC-FLASH label
Minimum required marking for 110.16 compliance
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WARNING
Arc Flash and Shock Hazards
Appropriate PPE Required
Failure to Comply Can Result in Death
or Injury
Refer to NFPA 70E
NEC 110.16 ARC-FLASH label
with more information
!
WARNING
Arc Flash and Shock Hazards
Appropriate PPE Required
Failure to Comply Can Result in Death or Injury
For practical
application needs
to be feet
34 inch Flash Hazard Boundary
3
cal/cm•2 Flash Hazard at 18 inches
1
Hazard Risk Category 4 cal/cm2 shirt & pants
hard hat, safety glasses, FR rated faceshield
480 VAC Shock Hazard
42 inch Limited Approach
12 inch Restricted Approach 500V Class 00 gloves,
1 inch Prohibited Approach leather protectors
Equipment Name: XYZ Motor Starter
OSHA
Electrical Safety
Requirements
NFPA 70E Qualified Person
A qualified person shall be trained and knowledgeable of construction
and operation of equipment or work method and trained to
recognize and avoid hazard (110.6(D)(1))
• Familiar with precautionary techniques, personal protective
equipment including arc flash, insulating and shielding
materials, insulated tools and test equipment
• Distinguish exposed energized parts from other parts
• Determine nominal voltage of live parts
• Understand safe approach distances in Table 130.2C
• Determine personal protective equipment for task
Regulations
OSHA GENERAL DUTY CLAUSE
29 USC 654 Section 5 (a) (1)
(a) Each employer
(1) shall furnish to each of his employees employment
and a place of employment which are free from
recognized hazards that are causing or are likely to cause
death or serious physical harm to his employees;
(2) shall comply with occupational safety and health
standards promulgated under this Act.
(b) Each employee shall comply with occupational safety and
health standards and all rules, regulations, and orders
issued pursuant to this Act which are applicable to his
own actions and conduct.
This snake was found dead on the electric fence in a oil
compound in Nigeria