Transcript Electrical Safety

Naval Safety Center EL Reps
EMCM (SW/AW) Jim Burke
[email protected]
EMCM (SW) Matt Kerridge
[email protected]
Comm: (757) 444-3520 Ext 7144,
DSN 564 Prefix
NSTM 300 REV 9
• REV 7 released APR 2005 (Pre-NIMITZ arc flash incident)
•Work Groups began MAR 2009 (RENTZ & REAGAN Electrocutions in NOV
09 and FEB 10)
•1 FEB 2012: REV 8 Released (Found Typos in IVV Table)
•1 MAY 2012 : REV 9 Uploaded to TDMIS
•JULY 2012: Implemented by TYCOMs (with exception of new 12 cal PPE)
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PREMISE
• ALIGN AS CLOSELY AS POSSIBLE
WITH NFPA 70E
• INCORPORATE ARC FLASH THEORY
AND PPE
• UTILIZE FLEET INPUT
• MUST FIT ALL AFLOAT PLATFORMS AS
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AN UMBRELLA INSTRUCTION
• 300-2.1.1 GENERAL. This chapter
provides the necessary framework to
perform work on electrical equipment in a
safe manner. It is the responsibility of
COMMANDING OFFICERS to ensure
such guidance is clearly understood and
strictly enforced.
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However, no guidance, no matter how exhaustive and thorough, can
substitute for proper deckplate level supervision and an alert and
questioning attitude on the person’s part.
Ultimately, every individual, from the Commanding Officer to the persons
performing the work, has not only a role to play but also a personal
responsibility in safety.
Electrical safety is an ALL-HANDS evolution.
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300-2.1.1.1 Personal
Responsibility.
•
Personnel must understand the rules and regulations
involved with electrical systems
• Responsibility of the chain of command to ensure that
persons are properly trained and qualified
• knowledgeable of this chapter and any other
applicable technical manuals and operation manuals.
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300-2.1.1.2 Contradictory
Guidance.
Type Commanders (TYCOMs) and individual commands may issue
local instructions that clarify the requirements of this manual
but shall not issue any guidance that is
contradictory to this manual without
NAVSEA approval.
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300-2.1.1.3 Chapter 300 Overview.
PARAGRAPH 300-2. - 300-2.3
General safety information
PARAGRAPH 300-2.4 - 300-2.8
• working on energized equipment
• exceptions for working on energized equipment
• damaged equipment
• portable equipment
• systems within medical spaces
PARAGRAPH 300-2.9
Rescue actions for victims of electrical shock
(& CPR Training Requirements)
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300-2.1.1.3 Chapter 300 Overview.
APPENDIX G
Supplemental discussion of electrical safety including
illustrative examples
APPENDIX H
Information on electrical/electronic workbenches
APPENDIX I
Personnel Protective Equipment (PPE) and has
applicable supply information for electrical safety
equipment
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New Terms Defined
ARC FLASH
Situation where electrical current passes through air gaps between
ungrounded conductors or between conductors and grounded
components.
May occur from insulation breakdown where the electrical current
jumps an air gap to a conductive surface
Inadequate separation of a worker from the energized part
The use of uninsulated tools
Two major hazards of arc flash
1) arc temperature
2) incident energy
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PPE is Effective
ARC BLAST
Occurs when the severity of an arc or short circuit current
causes destructive heating and explosive vaporization of both
the surrounding air and the metal in the current path.
The pressure wave can exceed thousands of pounds per
square inch, injuring workers by knocking them down or
collapsing their lungs
The sound of the blast can exceed 160 dB
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4160 VAC ARC BLAST
Arc Flash Burn (3rd Degree)
PPE Rated by Cal/Cm2
• Above 30V to 300VAC: 12 cal/cm2
faceshield.
• Above 300V to 1000 VAC: 12 cal/cm2
(coveralls, faceshield)
• Above 1000 VAC: 40 cal/cm2 (hood, body
suit).
• ALIGNS WITH NFPA 70E AND CIVILIAN
STANDARDS
Flash Protection Boundaries (FPB)
Unobstructed distance from exposed energized circuits within
which unprotected skin could receive a second degree burn if an
electrical arc flash were to occur
All personnel, required to be within the FPB for initial voltage
verification (IVV), circuit breaker racking, fuse removal/replacement,
or maintenance, shall wear the PPE identified in Table 300-2-1a,
Table 300-2-1b, Table 300-2-2, and Table 300-2-3
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NAVSEA Flash Protection
Boundary requirements
4 feet is applicable to circuits with rated
voltages between 30-1000 volts
11 feet is applicable to circuits with rated voltages
greater than 1000 volts up to 5000 volts
13 feet is applicable for voltages greater than 5000 volts
It is important to understand that personnel shall not be within
the FPB without the appropriate PPE
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300-2.5.1 INITIAL VOLTAGE
VERIFICATION (IVV).
Less than or equal to 30 volts (low risk).
category includes circuits rated less than or equal to 30 volts
that have been deenergized.
Greater than 30 to less than 1000 volts (low risk).
category describes situations when verifying the
equipment deenergized poses a low risk to personnel
• Single power source equipment (a single-speed motor, an oven, a string of
lights, etc.).
• Multiple power source equipment as designated by the Commanding Officer in
writing to be low risk (e.g., a single-speed motor controller that also has an alarm
circuit, a fan with two power supplies, etc.)
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300-2.5.1 INITIAL VOLTAGE
VERIFICATION (IVV).
Greater than 30 to less than 1,000 volts (medium risk).
category describes situations when verifying the
equipment deenergized poses a medium risk to personnel.
• Load centers and switchboards rated less than 1000 volts.
• Newly installed equipment, until the electrical safety isolation has
been verified.
• Multiple power source equipment that has not been designated
as low risk by the Commanding Officer
• Damaged equipment as described in paragraph 300-2.6.
High Risk. This category describes situations when verifying the
equipment deenergized can pose a higher risk to personnel.
• Equipment and systems that are rated 1000 volts or greater.
• Equipment and systems that PMS or equipment technical manuals
designate as requiring greater than 12 cal/cm2 arc flash PPE to verify
deenergized.
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300-2.4 ENERGIZED WORK
GENERAL REQUIREMENTS.
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300-2.4.2 ENERGIZED WORK
REQUIREMENTS.
Ensure a safety brief is conducted, including supervisory personnel,
prior to commencing work
Never work on energized electrical or electronic equipment alone
person trained in first aid for electrical shock shall be present as a safety observer
Minimize work on energized equipment….. should only be done when absolutely
necessary
Person shall be electrically safe
• shall not wear watches, rings, chains, metal articles
• or loose clothing that might accidentally contact energized parts
• Clothing and shoes shall be as dry as possible
Insulate the deck or standing surface from ground
Use only one hand to do the work, if practical
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300-2.4.2 ENERGIZED WORK
REQUIREMENTS.
Wear properly rated rubber gloves
A protective, impact-resistant, arc flash-rated faceshield
per Appendix I shall be worn
A protective, arc flash rated coat, overalls, hood, and/or coveralls (arc
flash suit), in accordance with Appendix 300-I shall be worn when
applicable per Table 300-2-1a, Table 300-2-1b, Table 300-2-2, and Table 3002-3
Minimize access to the energized work areas to keep unauthorized
personnel at a safe distance. per Table 300-2-1a, Table 300-2-1b, Table
300-2-2, and Table 300-2-3.
Use only electrically insulated tools with an electrical insulating material that
covers exposed metals
For work greater than 300 volts, a non-conducting safety line or
equivalent shall be attached
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300-2.4.2 ENERGIZED WORK
REQUIREMENTS.
Take the following extra precautions when the nature of the work is
particularly hazardous and provides increased risk of contact with an
energized conductor.
Station personnel with communications, as necessary, so
that the circuit or switchboard can be deenergized
Personnel shall be properly supervised while performing
particularly hazardous work. The supervisor shall not be involved
in the actual work
Provide insulated barriers between the work and any energized
metal parts adjacent to the work area
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300-2.5.3 FUSE REMOVAL AND
REPLACEMENT.
300-2.5.3.4 Exceptions For Critical Equipment. Fuses should always
be removed from a verified deenergized panel. However, removing or
replacing fuses in energized circuits is permitted if deenergizing the
circuits to the line side fuse clips would require shutdown of critical
equipment. The Commanding Officer will designate which
critical equipment is necessary for safe ship’s operation or performance
of the ship’s mission.
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CKT BREAKERS AND
DISCONNECT LINKS
300-2.5.4.3.3 Energized Enclosure Precautions. There may be instances where a
circuit breaker is racked-in/out from an energized switchboard. This evolution can
expose the technicians to both electrical safety and arc flash
hazards and should only be done when it is not practical to deenergize the
switchboard. Commanding Officer, or designated representative permission is
required. Follow the requirements of Table 300-2-3 for electrical safety
and arc flash PPE. For circuit breakers in switchboards rated greater than 1000
volts, this is an approved exception to the prohibition against work on energized
equipment greater than 1000 volts.
300-2.5.4.4 Disconnect Links Operation. Prior to operating disconnect links,
verify both sides are deenergized per the applicable portions of paragraph
300-2.5.1.
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300-2.5.5 VISUAL INSPECTIONS.
There may be times when visual inspections of
non-damaged equipment are required
defined as an inspection of energized equipment, circuitry,
or components within an enclosure with no physical contact
made with energized components
shall not break the electrical safety plane.
Imaginary plane formed by the opening of
an electrical enclosure, when the door is
opened or cover removed
If electrical components are mounted on the door, then the
plane includes the arc formed by the doors edge as it swings
open.
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300-2.5.5.2 Requirements.
Visual inspections of energized equipment rated 1000 volts or above is not
permitted unless approved by NAVSEA instruction.
Commanding Officer’s, or designated representative’s, permission is required
unless the inspection is scheduled as part of routine maintenance, inspections, or
as part of tag-out validation. If scheduled, the applicable watchstanding
supervisor’s authorization shall be obtained prior to accessing energized panels
(i.e., EOOW, PPWO, CEW, as applicable).
Remove all metal and loose clothing.
Consideration should be given to having two persons present during the
inspection, especially if the equipment is in a hard to access location or
unmanned space.
Erect a barrier at least two feet from the electrical plane of the equipment. The
barrier may be a person, physical barrier, rope, or any other means to prevent
access to the immediate area around the equipment.
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300-2.5.5.2 Requirements.
Do not take uninsulated tools or equipment inside this boundary. This
requirement is not applicable for thermal imaging cameras in order to gain
access to all internal components for thermal imaging within the enclosure
At no point shall any portion of the inspector’s body or any tools come within
the electrical plane of the equipment. Caution must be taken to prevent being
in a position where loss of balance or tripping could cause the person to fall
into the energized parts.
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300-2.6.1 DAMAGED
ELECTRICAL EQUIPMENT.
A maximum degree of alertness and care is required to work on damaged
equipment. When working on electrical equipment or circuits that have been
damaged (i.e., equipment condition that could cause injury to personnel, or
further damage to the equipment, if used; usually caused by fire, steam leak,
blunt force, collision, battle damage, etc.),
observe the general electrical safety requirements of paragraph 300-2.3
and the requirements for maintenance of energized circuits of paragraph
300-2.4.2 until it is verified that all portions of the circuit, including exterior of
electrical enclosures, are isolated and deenergized.
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300-2.6.2 EQUIPMENT THAT
CAUSES A SHOCK.
If an electrical component has caused a shock, that component
should be deenergized immediately; do not operate the equipment until a
determination of whether the cause of the shock was equipment
damage/malfunction is completed. If it is determined that shock was caused
by equipment malfunction, then the equipment shall be considered as
damaged and handled per paragraph 300-2.6.1 until repaired. If it is determined
the shock was a result of personnel error, improper test leads, etc., then the
equipment does not need to be treated as damaged gear, but instead should be
evaluated by qualified personnel prior to restoring for unrestricted use.
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300-2.6.3 INOPERATIVE OR
MALFUNCTIONING EQUIPMENT.
Inoperative or malfunctioning equipment is equipment or circuits that are not
operating properly, (abnormal noise, abnormal indication or response, etc.),
but has not suffered a casualty. This equipment does not need to be
considered as damaged equipment for repair/operations, but should undergo
troubleshooting and repair as soon as operationally practical. If multiple
indications point to potential electrical equipment damage, such as
ground indications with abnormal current or voltage indications or smoke
and/or acrid odor, then the equipment should be treated as damaged per
paragraph
300-2.6.1.
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300-2.6.4 WETTED EQUIPMENT
Equipment may become wetted due to leaks, flooding, fire fighting, etc.
and must be dried off. The risk of a shock from gear wetted on the outside is
low, but should be considered prior to wiping off water. At a minimum, rubber
gloves should be worn while wiping off the equipment. If installed,
a ground detector should be used to monitor for grounded equipment before
and after drying the equipment. If it is determined that the equipment has
internal wetting, then equipment should be completely deenergized,
inspected, dried internally, and restored to proper operating condition prior to
re-energizing.
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300-2.7.3.5.4 Mounted Mobile
Electrical Equipment
Mobile electrical equipment shall be receptacle connected if the equipment
is not permanently mounted and has a power cord less than 25 feet long.
If the mobile equipment is permanently mounted and the power cord is
less than 25 feet, it may be either receptacle-connected or hard-wired. If
the power cord must be more than 25 feet long, the equipment must be
permanently mounted and hard-wired.
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300-2.7.6.2 Approval of Personal
Electric Gear.
300-2.7.6.5 Personal Entertainment Gear. Personal electronic equipment such
as radios, alarm clocks, televisions, game systems, DVD players, musical
instruments, and amplifiers that do not meet the requirements of paragraph 3002.7.3.3, paragraph 300-2.7.3.4, or paragraph 300-2.7.3.5 shall meet the
requirements of paragraph 300-2.7.3.6.4.
300-2.7.6.6 Personal Irons, Coffee Pots, Hair Dryers, and Curling Irons.
Personal irons, coffee pots, hand-held hair dryers, and curling irons shall meet
the provisions of paragraph 300-2.7.3.1 through paragraph 300-2.7.3.5.4
and shall be provided with a power cord in conformance with the requirements
of paragraph 300-2.7.4 through paragraph 300-2.7.4.3.
Final acceptance or rejection is at the discretion of the Electrical Safety Officer.
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300-2.7.6.8 Prohibited Personal
Gear
Personally-owned equipment such as fans, extension cords, high intensity
lamps, reading lamps, electric blankets, heating pads, electric powerdriven tools (except those specifically used as hobby tools), heat/sun
lamps, hot plates and griddles, microwave ovens, portable extension
lights, electric heaters, refrigerators, air conditioners, and immersiontype water heaters are prohibited from being introduced and used onboard
ship. Adequate government-owned equipment is provided to meet the needs
associated with these items.
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300-2.9.3 CPR.
Each ship shall have a certified American Red Cross/American
Heart Association CPR instructor on board.
At least 50 percent of all electrical/electronics′
associated ratings shall be certified in CPR.
All electrical/electronics′ associated ratings shall conduct
annual training in CPR training must be provided by a
certified CPR instructor.
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New 2010 BLS-HS Standards
CARDIOPULMONARY RESUSCITATION (CPR)
Place victim flat on their back on a firm surface
1. Check for response, check for breathing, call for help (911). Give 30
chest compressions 2 inches deep.
2. Give 2 rescue breaths, and then continue with another cycle of
compressions.
3. Continue with the 30 compressions to 2 breaths. Continue until help arrives.
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300-H.6 REDESIGNATION OF
ELECTRICAL WORKBENCH TO
MECHANICAL WORKBENCH.
In the event that a workbench is no longer required (i.e., existing
in a non-electrical work re-designated work space),
work benches may be downgraded with approval and direction of
the Commanding Officer and approved Departure from
Specification. (CHANGE FROM ELECTRICAL OFFICER AS
ONLY APPROVAL OF CHANGE)
EVERY SHIP MUST HAVE AT LEAST ONE.
ALSO- WORDING UNDER DISCONNECT SWITCHES HAS
CHANGED- REMOVING THE TERM “PUSH BUTON” TO
ALLOW FOR ROTARY SWITCHES.
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APPENDIX I: SUPPLY
INFORMATION (NEW)
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APPENDIX I: NEW ADDITION
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QUESTIONS????
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