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DOCUMENT ID: |
6230
Electronic Equipment Safe Work Program |
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1.0
Purpose
This
chapter and its associated appendices are written to outline Jefferson Lab’s programs
and procedures to satisfy the requirements of 10
CFR 851-Worker
Safety & Health Program.
All
work on electronic
equipment is classified according to equipment Class and work Mode. Work performed at Jefferson Lab within these
Class and Mode configurations is done in accordance with the programs and procedures. Equipment defined as AC Utilization
Equipment is also covered.
|
NOTE: Work
performed on building
services electrical equipment
is covered in ES&H
Manual Chapter 6220 AC Electrical Equipment Safe Work Policy. |
2.0
Scope
Work
performed on electronic equipment exposes workers to potential electrical
hazards that may result in serious injury or death. These hazards include; shock, arc flash, arc
blast and other physical injury due to reactions to unexpected energy release. The program in this chapter defines the training
requirements and some basic work rules, based on the equipment Class and the
work Mode, which must be followed when doing work on electronic equipment. Worker qualification levels are identified as
well as information on the use of work planning and Work Control
Documents. Work that is permitted is
identified along with some work that is not allowed.
3.0
Responsibilities
NOTE: Management
responsibility may be delegated the discretion of the responsible manager.
3.1
Qualified Electronic Worker:
·
Ensure
required training is maintained and current (see Qualifications/Requirements listed
below).
·
Prior
to doing work, perform an informal hazard analysis to determine equipment Class
and work Mode.
·
If
necessary perform a Task Hazard Analysis
and file a work planning document (for example ATLis or FEList).
·
Ensure
authorization is received prior to beginning work.
·
Ensure
work is performed at the lowest energized state commensurate with accomplishing
the task.
·
Ensure
that all medium and high risk work (identified as Mode 2 and above on Class 2
or Class 3 equipment) follows an approved, current, Work Control Document.
·
Ensure each Mode 3 task on Class 2 or Class 3 electronic equipment is authorized under an Energized
Electrical Work Permit (EEWP), approved by the Laboratory Director before
beginning work.
·
Ensure that only qualified individuals
service electronic
equipment and that the work is accomplished as specified in
this manual
3.2
Supervisor/Subcontracting
Officer’s Technical Representative (SOTR)/Sponsor:
·
Conduct briefings on:
o work hazards
of Risk Code
2 or greater,
o procedures,
o PPE,
o control of
hazardous energy sources, or
o any special
precautions associated with planned work.
·
Ensure only
qualified and trained personnel are assigned to electronic equipment work and the training level is
consistent with the minimum requirements for the equipment Class and work Mode.
·
Provide a list of qualified
workers to the Department Manager and the Environmental, Safety, Health, and
Quality (ESH&Q) Electrical Safety Engineer.
·
Line supervisors are trained as
qualified workers at the same level, or above, as those they
supervise.
·
Maintain a list of workers who
are qualified and authorized to work on Class 1 equipment, performing Mode 2
and Mode 3 tasks.
· Maintain a list of workers who are qualified and authorized to work on Class 2 and Class 3 electronic equipment.
·
Review and recommend for approval all EEWPs and Work
Control Documents for work on Class 2 and Class 3 electronic equipment to be performed by department workers.
3.3
Associate Director/Division Head:
·
Approve all Work Control Documents
(e.g., Operational
Safety Procedure [OSPs], Temporary
Operational Safety Procedure [TOSPs]) for Mode 2, Class
2 or Class 3 work.
·
Review and recommend for approval
of EEWPs for Mode 3 work on Class 2 or Class 3 electronic equipment performed by department/division qualified workers.
3.4
Laboratory Director:
·
Approve all EEWPs for Mode 3,
Class 2 or Class 3 work on electronic
equipment.
4.0
Expectations
The hazard
exposure and consequent risks are determined by the equipment Class and the
work Mode (see ES&H
Manual Chapter 6230 Appendix T1 Determining Equipment Class and Work Modes).
A graded approach, based on
Classes and Modes, is used to determine training requirements and worker
qualifications required for performing work on electronic equipment. Listed below are the minimum
requirements. Supervisors, or other
organizational groups, may specify more stringent rules.
4.1
Qualifications/Requirements:
4.1.1
Mode 1 Work Only Equipment fully
de-energized
Workers who are not qualified may
work on electronic equipment (e.g. – mechanical technician can change magnet
cooling hoses; a vacuum technician can change a pump motor); if they comply
with the following rules:
·
They
have current SAF104 – Lock, Tag,
and Try training.
· They witness/observe the “safing-out” of the equipment to be worked on.
·
They apply their Lock-Out device to the de-energized piece of equipment.
·
Work
is approved and authorized.
Only qualified workers perform
Lock–Out on Class 2 or Class 3 equipment.
Lock-Out of Class 2 and 3 equipment must be done by qualified workers. Exceptions to this rule are:
·
If
the equipment is equipped with a plug type power connector and the worker has
been trained on, and utilizes the equipment specific lock, tag, and
try (LTT) procedure.
·
If
the purpose of the lock out is to perform non-electrical work where the worker
will not be exposed (or potentially exposed)
to any electrical shock or arc hazards during lock out or conducting the
work. Also the worker must be trained on
the equipment specific LTT procedure.
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REMINDER: A zero voltage test, as in
the “Try” portion of LTT, is a Mode 2 operation, when a Voltage Verification Unit
(VVU) is not present, and constitutes exposure – see ES&H Manual Chapter
6230 Appendix T1 Determining Equipment Class and Work Mode) |
4.1.2
Mode 2 and 3 Work on Class 1
Equipment:
Class 1 equipment
is considered low hazard and is a low risk for injury. As a result, training requirements are less
stringent. Work is allowed at all work
Modes on Class 1 equipment if the worker has the following training and
requirements:
·
SAF603A - Electrical Safety
Awareness
·
SAF603N – NFPA 70E Basic Electrical
Safety
·
Demonstration
of satisfactory understanding (to person authorizing the work) of the
following:
o
Use
of Work Control
Documents
o
Differences
between Class 1 and Class 2 or Class 3 equipment.
4.1.3
Mode 2 Work on Class 2 and Class
3 Equipment:
Class 2 and Class
3 equipment are considered medium and high hazard respectively. Mode 2 involves
testing and measuring of energized equipment with normal protective barriers
removed and potentially bypassed interlocks.
Workers performing Mode 2 work are exposed to operating voltages and
currents that can cause serious injury or death. As a consequence, the knowledge and training
required to perform Mode 2 work is more stringent.
|
NOTE: The “Try” process in the LTT lockout
procedure is considered a Mode 2 operation, if protective barriers (covers,
doors, etc.) are removed in order to take a measurement. Use of an installed VVU is not considered a
Mode 2 operation. |
The following is required for Mode 2
work on Class 2 and Class 3 equipment:
·
SAF603A - Electrical Safety
Awareness
·
SAF603N – NFPA 70E Basic Electrical
Safety
·
Demonstration
of satisfactory understanding (to person authorizing the work) of the
following:
o
Proper use of precautionary
techniques
o
Proper use of PPE (including
shock and arc flash insulation and shielding materials)
o
Proper use of insulated tools and
equipment
o
Skills and techniques necessary
to distinguish exposed energized parts from other parts of electronic equipment
o
Skills and techniques necessary
to determine the nominal voltage of exposed energized live parts
o
Decision making process necessary
to determine the degree and extent of the hazard and the PPE and job planning
necessary to perform the task safely
o
Shock hazard boundaries and
distances for voltages to which the worker will be exposed
4.1.4
Mode 3 Work on Class 2 and Class 3
Equipment:
Mode 3 work is defined as manipulative
operations on an energized circuit.
This may include re-wiring or replacing components in an energized piece
of equipment. In general this is not
usually necessary for any reason in electronic
equipment at Jefferson Lab. In the event that Mode 3 work is required on
Class 2 or Class 3 equipment special rules apply:
·
Training
identical to that required for Mode 2 work on Class 2 and Class 3 is required
·
Mode 3 work is to be performed
under a task specific Work Control Document approved by the cognizant
Department Head and Associate Director.
·
An EEWP approved and signed by the Laboratory
Director for the specific task is required.
The EEWP shall justify the reason(s) why the work has to be performed
with the equipment energized.
5.0
Technical
Appendices
5.1 Determining Equipment Class and Work Mode
The work rules for electronic equipment are dependent on both the equipment Class and the work Mode. Training requirements and the necessity for Work Control Documents are determined by an evaluation of the Class and Mode. The Class, Mode, and minimum work rules are determined based on the information in ES&H Manual Chapter 6230 Appendix T1 Determining Equipment Class and Work Modes.
5.2 Work Rules depending on Equipment Class and Work Mode
The work rules for electronic equipment are dependent on both equipment Class and work Mode. Workers must determine the training requirements and applicable work rules once the equipment Class and work Mode are identified. The required steps for turning a work assignment into a work plan can then be determined. ES&H Manual Chapter 6230 Appendix T2 Work Planning and Execution for Electronic Equipment Safety provides an outline for determining the steps necessary to plan work on this type of equipment, identify the hazards, and develop work controls.
6.0
References
·
NFPA
70E - Standards for Electrical Safety in the Workplace
·
NFPA 70 - National Electric Code
·
OSHA Regulation 29
CFR 1910 Subpart S and 29
CFR 1926 Subpart K
·
DOE Electrical Safety Handbook
7.0
Revision Summary
Periodic Review – 11/27/11 – No changes required at this time. Minor edits to reflect current ES&H Manual format.
Revision 1 -12/10/08 – Update to reflect current laboratory operations.
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ISSUING
AUTHORITY |
TECHNICAL POINT-OF-CONTACT |
APPROVAL
DATE |
REVIEW
REQUIRED DATE |
REV. |
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ESH&Q Division |
12/10/08 |
12/10/14 |
1 |
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