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)


https://federalregister.gov/a/2013-29579

https://federalregister.gov/a/2014-22148

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


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• Existing rules were recognized as being out of date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


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


OSHA Revisions – Resources

• https://www.osha.gov/SLTC/etools/electric_power/index.html


https://www.osha.gov/SLTC/etools/electric_power/index.html

Other Resources – Iowa

• http://www.iowaworkforce.org/labor/iosh/index.html


http://www.iowaworkforce.org/labor/iosh/index.html

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.





– §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)





– 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.




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



• §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


Photo Credit: Hubbell Chance


• §1910.269(u) – Substations

• §1910.269(v) – Power

generation

• §1910.269(w) – Special

Conditions


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.


Subpart R, §1910.269(l)(3)

• Revised approach distances and tables:


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.



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.



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


Photo Credit: Carhartt


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.


Photo Credit: Carhartt

Photo Credit: Tyndale


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.


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


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


SUBPART S – OVERVIEW

Subpart S – Safety-related Work Practices


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


Thank You

David D. Tucker, P.E.

Associate

Electrical Power Systems –

Technical Strategy Leader

david d. tucker, p.e. associate electrical and power

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