NESC- 2012 – PART 4 WORK RULES CHANGES Objectives

2011 ES&H EFCOG
National Electric Safety Code- 2012
Part 4- Work Rules Update
NESC- 2012 – PART 4
WORK RULES
CHANGES
Pam Tompkins, CSP, CUSP, CUSA
President, SET Solutions, LLC
Lexington, SC
Objectives








Consensus standards
NESC scope
Review how consensus standards are used
Review state adoptions of the NESC-2012
Review the NESC update cycle
NESC purpose
Basic provisions
2012 changes
NESC
What is a consensus
standard?
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2011 ES&H EFCOG
National Electric Safety Code- 2012
Part 4- Work Rules Update
Consensus Standards

NESC

NFPA 70E

ANSI

ASTM

IEEE

Others





National Electric Safety Code
National Fire Prevention Association
American National Standards Institute
American Society for Testing and Materials
Institute of Electrical and Electronic Engineers
Is the NESC a Legal Document?


The NESC is a voluntary standard.
Some editions and some parts of the Code have
been adopted, with and without changes, by
some states and local jurisdictional authorities.
NESC
OSHA Interpretation November 22, 2005

Please note that while OSHA does not enforce
national consensus or industry standards
directly, OSHA may consider such standards,
including the National Electrical Safety Code
(NESC), published by the Institute of Electrical
and Electronic Engineers, Inc., when
determining whether a hazard is "recognized"
and whether there is a feasible means of abating
such a hazard.
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2011 ES&H EFCOG
National Electric Safety Code- 2012
Part 4- Work Rules Update
Scope


NESC (National Electric Safety Code)
NESC covers:

Supply and communication facilities including
metering and associated work practices employed by:






Public or private electric supply
Communications
Railway
Trolley
Street and area lighting
Traffic signal or other signal
Scope

The generation, transmission, and distribution of
electricity, lumens, communication signals and
communication data through public and private
utility systems that are installed and maintained
under the exclusive control of utilities or their
authorized representative.
Scope

Utility owned premises covered by NEC
 Office
buildings
 Warehouses
 Garages
 Any
facilities that are not an integral part of a
generating plant, substation, or control
center.
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National Electric Safety Code- 2012
Part 4- Work Rules Update
NESC vs NEC
NEC- National Electric Code

Covers facilities
that do not
generate, transmit
or distribute
electric power
 Typically
facility
wiring systems.
NESC Revision Cycle


The NESC is revised every 5 years
NESC-2017 schedule








July 15, 2013- Final date to receive change proposals
September- October 2013- Committees meet and consider change proposals
September 2014- Proposed amendments printed. Comment period opens.
May 2015- Committee study period and comments- Comments due
October 2015- Committees prepare final report
January 2016- Proposed revision of NESC to NESC committee for letter
ballot.
May 2016- Committee approved revisions submitted to ANSI for recognition as
an ANSI standard
August 2016- Publication of the 2017 Edition of the NESC
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2011 ES&H EFCOG
National Electric Safety Code- 2012
Part 4- Work Rules Update
NESC 2012


2012 CODE PUBLISHED AUG 1, 2011
EACH STATE RESPONSIBLE FOR
ADOPTING NEW CODE
 MOST
 SOME
STATES DO – IN SOME FASHION
STATES DO NOT
State Adoption NESC 2012
New edition of the code automatically adopted
State
Code
State
Code
State
Code
AL
2012
ID
2012
MS
2012
AK
AZ
AR
2012
IL
MO
IN
MT
IA
NE
CA
KS
CO
KY
NV
2012
NH
CT
2012
LA
DE
2012
ME
2012
NJ
NM
DC
MD
2012
NY
2012
FL
MA
NC
2012
GA
MI
ND
HI
MN
2012
OH
State Adoption NESC 2012
New edition of the code automatically adopted
State
Code
OR
State
UT
PA
2012
VT
RI
2012
VA
SC
2012
WA
SD
WV
TN
WI
TX
Code
2012
WY
2012
2012
2012
Note: The information from the survey was complied and distributed for informational purposes only. This information is not i ntended to provide an interpretation
of the data received. IEEE is not responsible for verifying the accuracy of information provided by the Commissions.
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2011 ES&H EFCOG
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Part 4- Work Rules Update
Purpose
Better
clarification
for 2012
Purpose

Practical safeguarding during installation,
operation and maintenance of electric supply
and communication facilities for:
Persons
Utility facilities
 Affected property


Basic Provisions

Necessary for the safeguarding of:
The public
Utility workers (employee and contractors)
 Utility facilities
 Electric supply and communication equipment
connected to utility facilities, and
 Other facilities or premises adjacent to or containing
utility facilities.


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Part 4- Work Rules Update
NESC

Divided into one section and four (4) parts:
Section 9- Grounding methods for electric supply and
communication facilities
 Part 1- Electric supply stations
 Part 2- Safety rules for overhead lines
 Part 3- Safety rules for underground lines

Part
4- Work rules
NESC Part 4

Additional rules for supply employees

General
Energized conductors or parts

Switching control procedures

Work on energized lines and equipment

De-energizing equipment or lines to protect employees

Protective grounds
Live work



Protection against arcing and other damage while
installing and maintaining insulators and conductors
410. General Requirements

A. General 2.

Changes the word
facilities to lines and
parts.
 The
employer shall
provide training to all
employees who work
in the vicinity of
exposed energized
lines and parts.
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2011 ES&H EFCOG
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410 General Requirements

A. General 3.

Requires each
employer to perform an
arc hazard assessment
for employees who
work on or near
energized lines, parts
or equipment at 50V
to 800 kV.
Picture used by courtesy of Westex, Inc.
410. A. General 3a.

Requires employers to determine the effective
arc rating of clothing or clothing systems to be
worn by employees working on or near
energized lines, parts, or equipment at
voltages 50V-800 kV by one of the following
methods:


Perform a detailed arc hazard analysis.
Use tabulated values in tables provided.
 Table
410-1 (50V-1000V)
410-2 (1.1kV-46kV)
 Table 410-3 (46.1kV-800kV)
 Table
Table 410-1
Clothing and clothing systems for voltages 50-1000V
Nominal voltage range and cal/cm2
Equipment type
50-250 V
251-500 V
501-1000 V
•Self–contained
meters/cabinets
4
20
30
•Pad-mounted transformers
4
4
6
•CT meters and control
wiring
4
4
6
•Metal-clad
switchgear/motor control
centers
8
40
60
•Pedestals/pull boxes/hand
holes
4
8
12
•Open air (includes lines)
4
4
6
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2011 ES&H EFCOG
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Part 4- Work Rules Update
Table 410-1 (continued)
Clothing and clothing systems for voltages 50-1000V
Nominal voltage range and cal/cm2
Equipment type
•Network protectors
50-250 V
251-500 V
501-1000 V
4
Footnote 11
Footnote 11
Footnote 10
•Panel boards-single phase
(all)/three phase (<100A)
4
8
12
•Panel boards-three phase
(>100A)
4
Footnote 13
Footnote 13
Footnote 11- Industry testing on 480V network protectors indicates arcs will not selfextinguish and heat flux rates will exceed 60 cal/cm2/s at 24 in working distance.
Perform arc hazard analysis. (See Eblen and Short [B31].)
Footnote 13- Industry testing on panelboards with edge-mounted, parallel bus bars
indicate arcs will not self-extinguish and heat flux rates will exceed 60 cal/cm2/s at 18 in
working distance. Perform arc hazard analysis. (See Eblen and Short [B31].)
Other Footnotes- Many that relate to testing criteria
Updated Tables


Table 410-2- Clothing and clothing systemsvoltage, fault current and maximum clearing
times for voltages 1.1 kV to 46 kV ac
Table 410-3- Live-line tool work clothing and
clothing systems- voltage, fault current and
maximum clearing time for voltages 46.1 kV to
800 kV ac

Major changes throughout the table
410. A. General 3b.

Wording changeEnsure acetate,
nylon, polyester or
polypropylene is not
worn unless the
material is flame
resistant.
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410. A. General 3b.

Added Note 1:
Assessments
performed to
determine potential
exposure to an
electric arc consider
the affected
employee’s
assigned tasks
and/or work
activities.
410. A. General 3b.


Changed original
Note 1 to Note 2Added natural fiber
to non-flame
resistant material.
Committee
discussion
concerning clothing
systems.

Note- This is a major difference
between NESC and NFPA-70E
410. A. General 3b.

Changed original
Note 2 to Note 3Added

Utilizing engineering
controls to reduce
arc energy levels
and work practices
to reduce exposure
levels.
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Supporting Comments
Subcommittee 8

Established a low-voltage arc flash work group
(WG).


Evaluate minimum clothing or clothing system
requirements for employees working on voltages less
than 1000 volts.
PG&E completed tests during 2008 to determine
the arc flash characteristics of 480 V selfcontained metering equipment by creating fault
conditions at various kA levels.


WG collaborated with PE&G on tests.
Application of an accepted industry standard (IEEE-1584IEEE Guide for Performing Arc Flash Hazard Calculations2002)
Supporting Comments
Subcommittee 8

The new table (410-1) uses an 18 inch worker
separation.



Unlike the existing higher voltage tables which uses a
15 inch worker separation.
The WG committee based the change on the
application of IEEE 1584 test methodologies and
typical working distances for low-voltage motor
control centers and panel boards.
The employee working distance is based on the
incident energy on the worker’s face and body not
on the hands and arms.
Clause 9 (Change Proposals)
Flame-resistant protective clothing and personal protective equipment

Gives good methodology for arc flash risk
factors to consider such as:
Equipment condition
Work methods
 Task elements
 Incident energy specifics
 Flash hazard analysis



Introduces arc flash protection boundary.
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Part 4- Work Rules Update
Arc Flash Protection Boundary


A calculated distance away from the potential
arc source at which an employee would not be
expected to receive more than a secondary
degree burn.
The arc flash protection boundary is located at a
distance where the incident energy is measured
at 1.2 cal/cm2
Incident Energy
Measured
from the arc
potential to the
employees face
and/or torso
Arc flash protection
boundary
1.2 cal/cm2
Possible Risk Factors

Equipment condition



Equipment failure record
Equipment showing
visible signs of distress
Work methods

Task requires exposing
energized part.



Opening door
Removing access panel
Ease of movement



Open area
Confined space
Working position
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Possible Risk Factors

Work methods

Access methods
Ladder
Structure steel
 Aerial lift
 Climbing
 Helicopter


Level of training to
perform job
 Definition of working
“near” energized parts.
 Definition of working
“on” energized parts

Possible Risk Factors

Work methods

Work method used
 De-energized
 Rubber
gloves
line tools
 Live line barehand
 Live

Status of
LOTO/switchingtagging
Possible Risk Factors

Task Elements

Task requires a circuit
transitional change.
 Opening
a breaker
a disconnect switch
 Lifting a jumper
 Replacing a fuse
 Opening

Working on exposed
energized parts.
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Possible Risk Factors
Crew has the enough
employees to
complete the work
safely.
 Task history?
 Other

 Environment
 Weather
 Lighting
 Cleanliness of
area
Possible Risk Factors

Incident energy
specifics
Level of possible
incident energy
 Distance from
possible source
 Voltage involved
 Arcing fault current


Flash hazard
analysis
Clause 9- Change Proposals
Flame-resistant protective clothing and personal protective equipment


Give methodology for calculations for incident
energy levels on low voltage systems.
Examples include:
Single phase, overhead or pad-mounted 120/240V
transformers.
 Three phase, overhead or pad-mounted 120/208V
and 277/480V transformers.
 Three phase spot network, 277/480V 500, 1000, 2000
kVA transformers in various banks.
 Three phase network, 120/208V 500 kVA
transformers in 3 and 6 feeders.

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410. General Requirements

B. Emergency
procedures and first
aid rules procedures

Change in wordingEnsures copies of
emergency and first
aid procedures are
accessible to
employees where
they work.
410. General Requirements

C. Responsibility
A
designated person
shall be in charge of
the operation of the
equipment and lines
and shall be
responsible for their
safe operation.
411. Protective Methods and Devices

A. Diagrams

Diagrams, showing the
arrangement and
location of the electric
equipment and lines
shall be maintained and
shall be readily available
to employees.
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411. Methods

C. Inspection and testing of
protective devices
 Changed terms line worker's
body belts, lanyards and
positioning straps and other
personal equipment to:


Climbing and fall protection
equipment.
Requires an inspection
before use to ensure the
climbing and fall protection
equipment are in safe
working condition.
411. Protective Methods and Devices
D. Safety Signs and Tags

 Safety
signs and tags shall comply with the
provisions of ANSI Z535.1-2006 through ANSI
Z535.5-2007.
Safety Signs and Tags

The grouped safety messages appear with the
words:
“Danger”- Red- Hazard will cause injury
“Warning” – Orange- Hazard could cause injury
 “Caution”- Yellow- Hazard may cause injury
 “Notice”- Blue- Notice information


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Safety Signs and Tags
411 Fall Protection

F. Fall Protection

Non- locking snap
hooks shall not be
permitted.
SECTION 42
GENERAL RULES
FOR EMPLOYEES
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420. Personal General Precautions

A. Rules and emergency methods


Employees shall study and know safety rules
pertaining to their jobs.
B. Qualification of employees

Employees shall perform only tasks for which they
are trained.
420. General

C. Safeguarding oneself and others

Employees shall report any of the following to the
proper authority:
 Line
or equipment defects to include abnormally
sagging wires, broken insulators, broken poles or lamp
supports.
 Accidently energized objects such as conduits, light
fixtures or guys.
 Other defects that may cause a dangerous condition.
421. General Operating Routines

A. Duties of first-level supervisor or person in charge

Have the authority to prevent accidents.
Ensure safety rules and procedures are followed.

Keep necessary records and reports.

Prevent unauthorized persons from approaching work sites.
Prohibit the use of unsuitable tools and equipment and tools and
equipment that has not been tested or inspected.


 Conduct
a Job Briefing
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Part 4- Work Rules Update
421. Job Briefing

Job briefing
requirement


Employees shall be
required to conduct
a job briefing before
beginning work.......
 NESC-2007does
not
contain a specific
requirement to
conduct a job
briefing.
The job briefing shall cover
at the least the following:

Hazards associated with the
job.

Work procedures involved

Special precautions

Energy source controls

PPE requirements.
422 A. Setting moving or removing poles
in or near energized electric supply lines


NESC-2007 words “not
bonded to an effective
ground” was removed.
States: Contact with trucks,
or other equipment that is
being used to set, move, or
remove poles………shall be
avoided by employees
standing on the ground or in
contact with grounded
objects unless employees
are wearing suitable
protective equipment.
SECTION 44.
ADDITIONAL RULES
FOR SUPPLY
EMPLOYEES
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Section 44
Additional rules for supply employees

441. Energized conductors or parts (MAD tables)
 Table 441-1
 AC
 Table
 DC
 Table
live work minimum approach distance
441-2
live work minimum approach distance
441-3
 Altitude correction
 Table
factor
441-4
 Maximum
use voltage for rubber insulting equipment
Minimum Approach Distances
 Problem
 IEEE
516-2009 has been approved and is
available for purchase.
 Major changes were made in regards to MAD
distances in IEEE 516-2009.
 OSHA reopened the comment period two times
to ensure time for IEEE 516-2009 to be
approved.
 Will OSHA use IEEE 516-2009 and not
NESC which is an IEEE approved standard!
Minimum Approach Distances

441A Note 3Methodology for calculating minimum approach
distances (MAD) were taken from IEEE std 516-2009
Table 441-1 AC live work minimum approach distance
 Changes to voltages (301V- 800 kV)
 Added distance to employee from energized part
(transmission voltages 72.6-800 kV)


Without tools phase-to-ground
With tools phase-to-ground
 Without tools phase-to-phase


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2011 ES&H EFCOG
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Table 441-1 AC Live-Work MAD
Voltage in kV
phase to phase
Distance to employee
Phase to ground
(m)
0 to .050
(ft-in)
Not specified
0.051 to 0.300
Phase to phase
(m)
(ft-in)
Not specified
Avoid contact
Avoid contact
0.301 to 0.750
0.32
1-1
0.32
.751 to 15
0.64
2-2
0.67
1-1
2-3
15.1 to 36
0.73
2-5
0.84
2-10
36.1 to 46.0
0.79
2-7
0.94
3-1
46.1 to 72.5
0.89
2-11
1.15
3-9
Table 441-1 AC Live-Work MAD
Voltage in
kV phase to
phase
Distance to employee from energized part
Without tools
With tools
Without tools
phase to ground
phase to ground
phase to phase
(m)
(ft-in)
(m)
(ft-in)
(m)
(ft-in)
72.6 to 121
.94
3-1
1.01
3-4
1.37
4-7
121.1 to 145
1.07
3-7
1.115
3-10
1.62
5-4
145.1 to 169
1.20
4-0
1.29
4-3
1.88
6-3
169.1 to 242
1.58
5-3
1.71
5-8
2.77
9-2
242.1 to 362
2.56
8-5
2.75
9-1
4.32
14-3
362.1 to 550
3.38
11-1
3.61
11-11
6.01
19-9
550.1 to 800
4.54
14-11
4.82
15-10
8.87
29-2
Minimum Approach Distances

Table 441-2 DC live work minimum approach
distance
 Added distance to employee from energized part
(transmission voltages 72.6-750 kV)
 Without tools
 With tools
pole-to-ground
pole-to-ground
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444 D. Employee’s Protective
Grounds


Remove- Grounds shall be placed at each
side of the work location and as close as
practical to the work location………
Add- Temporary protective grounds shall be
placed at such locations and arranged in such
a manner that affected employees are
protected from hazardous differences in
electrical potential.
444 D. Employee’s Protective
Grounds

Note addedTouch and step
potentials.
 Additional measures
may include
barriers, insulation,
isolation or
grounding mats.

Picture courtesy of AB Chance Company
444 D. Employee’s Protective
Grounds

Exception added:

Alternative work methods such as isolation of
equipment, lines and conductors from all sources
including induced voltages may be employed
when the employer has assured worker protection
from hazardous differences in electrical potential.
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2011 ES&H EFCOG
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445. B.3. Removing Grounds

Note 1- added

Hazards due to electric and magnetic field
induction may exist when conductors, cables and
equipment are parallel or cross other energized
circuits.
References

OSHA, Line Contractors strategic Partnership- IEEE report

Hugh Hoagland- Arc Wear

OSHA

NFPA 70e

Salisbury Protective Products

Testing update on protective clothing and equipment for electric arc exposure,
IEEE

HD Electric

Arc Flash Phenomena- Collaborative Research Project- IEEE

Synergetic Design

OSHA

Brent McKinney- NESC- APPA Subcommittee member

Arcing Flash/blast review with safety suggestions for design and maintenance
Tim Crnko, Steve Dyrnes
Pamela (Pam) T. Tompkins, CSP, CUSA
President
710 East Main Street
Lexington, SC 29072
(803) 407-4707
Mobile (803) 917-1537
[email protected]
www.setsolutionsllc.com
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