David D. Tucker, P.E. Associate Electrical and Power ...
Transcript of David D. Tucker, P.E. Associate Electrical and Power ...
Overview of Electrical Safety
David D. Tucker, P.E.
Associate
Electrical and Power
Systems – Technical
Strategy Leader
Today’s Presentation
• OSHA Revisions
• Subpart R, §1910.269 overview
• Subpart I, §1910.137 overview
• Subpart S overview
CHP Operators Workshop – November 6, 2104 – Coralville, IA
OSHA REVISIONS
OSHA Revisions – What’s New?
• “Electric Power Generation, Transmission, and Distribution;
Electrical Protective Equipment”
– https://federalregister.gov/a/2013-29579
– Issued in April 2014
– Went into effect in July 10, 2014
– Amended in September 2014
(https://federalregister.gov/a/2014-22148)
CHP Operators Workshop – November 6, 2104 – Coralville, IA
OSHA Revisions – What’s New?
• “Electric Power Generation, Transmission, and Distribution;
Electrical Protective Equipment” includes:
– Background information on the rule
– Summary of the development process
– Comments from the public input process
– OSHA’s response to the comments
CHP Operators Workshop – November 6, 2104 – Coralville, IA
OSHA Revisions – Why?
• First major revision since approximately 1972
• Significant revisions to 29 CFR 1910, Subparts I, R, and S; and
29 CFR 1926
• Existing rules were recognized as being out of date
• Alignment with general industry safety standards was needed
• Alignment with personal protective equipment (PPE)
innovations
CHP Operators Workshop – November 6, 2104 – Coralville, IA
OSHA Revisions – Why?
• OSHA estimated that compliance with the revised rules would
increase the amount of prevented injuries and fatalities
– Approximately 53% of related serious injuries and fatalities
would have been prevented under the previous revision
– Approximately 80% of related serious injuries and fatalities
would be prevented under the new revision
– Or approximately an additional 140 serious injuries and fatalities
prevented
CHP Operators Workshop – November 6, 2104 – Coralville, IA
OSHA Revisions – Resources
• https://www.osha.gov/SLTC/etools/electric_power/index.html
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Other Resources – Iowa
• http://www.iowaworkforce.org/labor/iosh/index.html
CHP Operators Workshop – November 6, 2104 – Coralville, IA
SUBPART R, §1910.269 – OVERVIEW
Subpart R, §1910.269 – Scope
• Subpart R, §1910.269 – Electric power generation,
transmission, and distribution.
– §1910.269 (a)(1)(i)(A): Power generation, transmission, and
distribution installations, including related equipment for the
purpose of communication or metering that are accessible only
to qualified employees.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269 – Scope
• Subpart R, §1910.269 – Electric power generation,
transmission, and distribution.
– §1910.269 (a)(1)(i)(A): Power generation, transmission, and
distribution installations, including related equipment for the
purpose of communication or metering that are accessible only
to qualified employees.
Qualified person. One who has received training in and has demonstrated skills and
knowledge in the construction and operation of electric equipment and installations
and the hazards involved. (From §1910.399)
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269 – Scope
• Subpart R, §1910.269 – Electric power generation,
transmission, and distribution.
– Note to §1910.269 (a)(1)(i)(A): The types of installations covered
by this paragraph include the generation, transmission, and
distribution installations of electric utilities, as well as equivalent
installations of industrial establishments. Subpart S of this part
covers supplementary electric generating equipment that is
used to supply a workplace for emergency, standby, or similar
purposes only.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269 – Scope
• Subpart R, §1910.269 – Electric power generation,
transmission, and distribution.
– Note to §1910.269 (a)(1)(i)(A): The types of installations covered
by this paragraph include the generation, transmission, and
distribution installations of electric utilities, as well as equivalent
installations of industrial establishments. Subpart S of this part
covers supplementary electric generating equipment that is
used to supply a workplace for emergency, standby, or similar
purposes only.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269 – Scope
CHP Operators Workshop – November 6, 2104 – Coralville, IA
From Subpart R, §1910.269 – Appendix A
Subpart R, §1910.269 - Highlights
• §1910.269(a)(2) – Training
• §1910.269(a)(3) –
Information transfer
between owner and
contractors
• §1910.269(b) – Medical
services, first aid, and
associated training
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269 - Highlights
• §1910.269(c) – Job briefings
• §1910.269(d) – Energy control
procedures
• §1910.269(m) – Deenergizing
lines and equipment for
employee protection
• §1910.269(n) – Grounding for
the protection of employees
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Photo Credit: Hubbell Chance
Subpart R, §1910.269 - Highlights
• §1910.269(u) – Substations
• §1910.269(v) – Power
generation
• §1910.269(w) – Special
Conditions
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269(l) – Working on or near exposed
energized parts
• This paragraph applies to work on exposed live parts, or near
enough to them to expose the employee to any hazard they
present.
– §1910.269(l)(1)(i) – Only qualified employees may work on or
with exposed energized lines or parts of equipment.
– §1910.269(l)(1)(ii) – Only qualified employees may work in areas
containing unguarded, uninsulated energized lines or parts of
equipment operating at 50 volts or more.
– §1910.269(l)(1)(iii) – Electric lines and equipment shall be
considered and treated as energized unless they have been
deenergized in accordance with paragraph (d) or (m) of this
section.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269(l)(3)
• Revised approach distances and tables:
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Nominal voltage (kV)
phase-to-phase
Distance
Phase-to-ground exposure Phase-to-phase exposure
m ft m ft
0.50 to 0.300 Avoid Contact Avoid Contact
0.301 to 0.750 0.33 1.09 0.33 1.09
0.751 to 5.0 0.63 2.07 0.63 2.07
5.1 to 15.0 0.65 2.14 0.68 2.24
15.1 to 36.0 0.77 2.53 0.89 2.92
36.1 to 46.0 0.84 2.76 0.98 3.22
46.1 to 72.5 1.00 3.29 1.20 3.94
Table R-6—Alternative Minimum Approach Distances for Voltages of 72.5 kV and Less
Subpart R, §1910.269(l)(8) – Protection from flames
and electric arcs
• §1910.269(l)(8)(i) – The employer
shall assess the workplace to
identify employees exposed to
hazards from flames or from
electric arcs.
• §1910.269(l)(8)(ii) – For each
employee exposed to hazards
from electric arcs, the employer
shall make a reasonable estimate
of the incident heat energy to
which the employee would be
exposed.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269(l)(8) – Protection from flames
and electric arcs
• §1910.269(l)(8)(iii) – The employer shall ensure that each
employee who is exposed to hazards from flames or electric
arcs does not wear clothing that could melt onto his or her skin
or that could ignite and continue to burn when exposed to
flames or the heat energy estimated under paragraph (l)(8)(ii)
of this section.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Subpart R, §1910.269(l)(8) – Protection from flames
and electric arcs
• §1910.269(l)(8)(iv) – The employer shall ensure that the outer
layer of clothing worn by an employee, except for clothing not
required to be arc rated under paragraphs (l)(8)(v)(A) through
(l)(8)(v)(E) of this section, is flame resistant under any of the
following conditions
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Photo Credit: Carhartt
Subpart R, §1910.269(l)(8) – Protection from flames
and electric arcs
• §1910.269(l)(8)(v) – The
employer shall ensure that
each employee exposed to
hazards from electric arcs
wears protective clothing and
other protective equipment
with an arc rating greater than
or equal to the heat energy
estimated under paragraph
(l)(8)(ii) of this section
whenever that estimate
exceeds 2.0 cal/cm2.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Photo Credit: Carhartt
Photo Credit: Tyndale
Subpart R, §1910.269(l)(8) – Protection from flames
and electric arcs
• §1910.269(l)(8)(vi) – The obligation in paragraph
(l)(8)(ii) of this section for the employer to make
reasonable estimates of incident energy commences
January 1, 2015.
CHP Operators Workshop – November 6, 2104 – Coralville, IA
SUBPART I, §1910.137 – OVERVIEW
Subpart I, §1910.137 – Electrical protective
equipment
• §1910.137(a) – Added Class 00 gloves and rubber insulated
equipment
• §1910.137(b) – Added requirements of other types of non-
rubber electrical protective equipment
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Photo Credit: Salisbury/Hubbell
Subpart I, §1910.137 – Electrical protective
equipment
• §1910.137(c) – Care and use of electrical protective
equipment
– Updated for new ASTM equipment standards and revisions
– Updated for new testing requirements
CHP Operators Workshop – November 6, 2104 – Coralville, IA
SUBPART S – OVERVIEW
Subpart S – Safety-related Work Practices
CHP Operators Workshop – November 6, 2104 – Coralville, IA
From Subpart R, §1910.269 – Appendix A
Subpart S – Safety-related Work Practices
• §1910.331 – Scope for qualified and unqualified
persons
• §1910.332 – Training
• §1910.333 – Selection and use of work practices
• §1910.334 – Use of Equipment
• §1910.335 – Safeguards for personnel protection
CHP Operators Workshop – November 6, 2104 – Coralville, IA
Thank You
David D. Tucker, P.E.
Associate
Electrical Power Systems –
Technical Strategy Leader