ELECTRICAL ELECTRICAL SAFETY PROGR PROGRA AM DEVELOPED BY: ELECTRICAL SAFETY COMMITTEE MEMBERS: Mark Linsenbigler Linsenbigler,, Prog P rogram ram Manager, Manager, EHS E HS Don F ronk, ronk, Safety afety Coordinat oordinator or OP P Scotty cotty E ble, E lectrical Integrity Integrity Sup. / E ng Kevin Bryerton, Bryerton, Renovation enovation Supervisor upervisor J erome Fula Fulare, Elect Electrrical cal Tra Trade Sup Supervisor sor Lead Electrician (Central)
Dick Harris, Harris, Electrical lectrical Eng Engineer ineer Chuck huck Dobbins, Dobbins, E lectrical lectrical E ngineer ngineer Ted Kolbe, Construction onstruction Inspector Inspector Terry Long, Long, Lead Lead Electrician (Reno) (Reno) Mik Mike Reese Reese,, Elect Electrrica ical Dist Distrribution ion Sup Supv Ste Steve Bese Beseck cke er,
ORIGINAL IMPLEMENTATION DATE: August 1, 2005
APPROVALS: OPP Safety Coordinator:____________________________ Hum Human Reso Resource Ma Manager:____ __ ____ __ ____ __ ____ ____ ____ __ ____ __ ____ ____ ____ __ __ Deputy Associate Vice President:____________________________
OPP SAFETY AND HEALTH PROGRAM
Electri Electri cal Safety Safety Program 1.0 INTRODUCTION
Electricity is a serious workplace hazard, capable of causing both employee injury and property property damage. damage. It is the the policy of the the Pennsylvan Pennsylvania ia Stat State e University (PS (P SU), U), Office Office of P hysical Plant P lant (OPP (OP P ) to protect protect all employees, employees, stu s tudent dents, s, and other other personnel personnel from potent potential ial electrical electrical hazards. hazards. This will be accomplished through through compliance with with the the work work practices practices described herein along with effective application of engineering controls, administrative controls, and the use of personal protective equipment. The The PSU PS U OPP OPP Elect Electrrica ical Safe Safety Prog Program is founded on the princip ciple of avoidin iding g energize ized work unless it is absolutely neces necessary. sary. Live parts parts will be de-energized before an employee employee works on or near them unless one of the following conditions applies: •
De-e De-energizing nergizing i ntrod uces additio nal or increased hazards. hazards. Examples of “additional or
increased” hazards would include interruption of life support equipment, deactivation of emergency alarm systems, or shutdown of hazardous location ventilation systems. •
De-e De-energizing nergizing is not po ssibl e due to equipment design or operational limi tations.
Examples of this situation would include testing and troubleshooting of electrical circuits that can only be performed with the circuit energized and work on circuits that form an integral part of a continuous process that would otherwise need to be completely shut down in order to permit work on one circuit or piece of equipment. •
Live parts are operating operating at less than 50 volts to gr ound and th ere is no increased increased exposure to electri electri cal burns or to explos ion due to electrical arcs. arcs.
Live Live part parts s are to be be de-energized in accordance with with the the OP P Lockout Lockout/T /Tagout agout P rogram. rogram. If live parts are not placed in an electrically safe condition, the work practices described in this document must be used to protect employees.
This This progr ogram has be been est establish ished in order to: • • •
Ensure the safety of employees who may work on or near electrical systems. Ensure that OP P understand understand and comply comply with with safety standards standards related to to electrical work. Ensure that OP P follows uniform practices practices during the the completion completion of electrical work.
This This program applie lies to to all Penn Penn Stat State e properties an and work performed by Off Office of Physi Physica call Plant employees regardless of job site location. 4.0
REFERENCES • • •
NFPA 70E, “Standard for Electrical Safety in the Workplace”, 2004 edition OSHA 29 CFR 1910.331 through 1910.335, “Electrical Safety-Related Work Practices” Pennsylvania State University Lockout/Tagout Program
Safety Safety Coord inato r • • • • • • •
Receive Energized E nergized Work Perm P ermits, its, and route route to committ committee ee for approvals. Evaluate work being performed to determine compliance with this program. P rovide rovide or assist assist in task specific training training for electrical work qualifications. qualifications. Recordkeeping of all electrical work permits and training records. P eriodically eriodically review and update this this written written program. program. P rovide or coordinate coordinate general training for work units units on the content of this this program. program. Evaluate the overall effectiveness of the electrical safety program on a periodic basis. Assis Assistt OPP OP P work units units in implem implement enting ing the the provisions provisions of this program. program.
Determine the applicability of the electrical safety program to activities conducted within their respective areas of jurisdiction. Designate individuals responsible for the implementation of the electrical safety program within their areas. Actively support this this program program as part of the the OP P overall safety effort effort..
Supervisors • •
Ensure employees comply with all provisions of the electrical safety program. Ensure employees receive training appropriate to their assigned electrical tasks and maintain documentation of such training.
OPP • •
Complete calculations required by this program when needed. P lace an emphasis emphasis on controlling controlling electrical hazards through through the the application of engineering and design controls.
Electri cal Safety Safety Commi ttee • • •
Follow the work practices described in this document, including the use of appropriate protective equipment and tools. Attend all training required relative to this program. Immediately report any concerns related to electrical safety to supervision.
Electri cal Engin eerin eerin g •
Develop and maintain a listing of all qualified employees under their supervision. Ensure employees are provided with and use appropriate protective equipment.
Meet on a periodic basis to review electrical safety issues at PSU. Review all energized electrical work permits submitted for approval. P romote romote consistency consistency in how electrical tasks are completed completed within within the the various work units of PSU.
The The follow lowing ing terms ar are defined in order to allo llow a bett etter understa standing ing of this progr ogram: •
Arc Ar c rati r ati ng: ng : The The maximum incid cident energy resist sistan ance ce demonstr strated by a materia eriall (or (or a
layered system of materials) prior to “breaking open” or at the onset of a second-degree skin burn. burn. This rating rating is assigned assigned to electrical electrical protective protective clothing clothing and and is normally normally express expressed ed 2 in calories per square centimeter (cal/cm ). Electrically safe work condition: A state in which the conductor or circuit part to be worked on or near has been disconnected from energized parts, locked/tagged in accordance with with PS P SU policy, tested to to ensure the absence of voltage, and grounded grounded if determined necessary. Energized: Electrically connected to or having a source of voltage. Exposed (as (as applied t o l ive parts): Capable of being inadvertently touched or approached from closer clos er than than a safe safe distance by a person. person. It is applied applied to to parts that that are not suitably guarded, isolated, or insulated. Flash hazard analysis: A study investigating a worker’s potential exposure to arc-flash energy, conducted for the purpose of injury prevention and the determination of safe work practices along with appropriate levels of PPE. Flash protection boundary: An approach limit at a distance from exposed live parts within which a person could receive a second degree burn if an electrical arc flash were to occur. Flash Flash suit : A complete FR clothing and equipment system that covers the entire body, except for the hands and feet. (Such (Such a suit typicall typically y includes pants, jacket, jacket, and a “beekeeper” style hood fitted with a face shield).
• • •
FR apparel: Flame-resistant apparel; describes a broad category of clothing designed to
protect employees from electrical arc events during completion of energized tasks. Incident energy: The amount of energy impressed on a surface, a certain distance from the source, generated during an electrical arc event. One of the the units units used used to to meas measure ure 2 incident energy is calories per square centimeter (cal/cm ). Limited approach boundary: An approach limit at a distance from an exposed live part within which a shock hazard exists. Live parts: Energized conductive components. Prohibited approach boundary: An approach limit at a distance from an exposed live part within which work is considered the same as making contact with the live part. PPE: An acronym acronym for “P “P ersonal ersonal Protective P rotective Equipm Equipment” ent”. Qualifi Qualifi ed person: One who has skills and knowledge related to the construction and operation of the electrical equipment and installation and has received training on the hazards involved. involved. Restric Restric ted approach boundary: An approach limit at a distance from an exposed live part within which there is an increased risk of shock (due to electrical arc-over combined with inadvertent movement) for personnel working in close proximity to the live part. Unqualified person: Any person who does not meet the definition of a qualified person. Working near near (live parts): Any activity within a Limited Approach Boundary. Working on (liv e parts): parts): Coming in contact with live parts via tools, probes, test equipment equipment,, hands, feet, or other other body parts parts regardless regardless of the level of PP P P E worn. worn.
Employees who are exposed to an electrical hazard that is not reduced to a safe level by the installation must be trained.
The The leve evel of elect lectrrica ical saf safety training ing provided is dependent ent on whether the employ loyee is classified as a “qualified person” or “unqualified person”.
A “qualified person” shall be trained and knowledgeable in all of the following topics: • •
Construction and operation of equipment on which work is assigned. Skills and techniques necessary to distinguish exposed energized parts from other parts of electrical equipment. Skills and techniques necessary to determine the nominal voltage of exposed live parts. The The approach dist istances ces sp specif cified in this do docum cument and and the cor correspo sponding ing volta ltages to which the qualified employee will be exposed. The The process cess necessa cessarry to determine the degree and extent of elect lectrrical cal hazar zards along with with the the PP P P E and job planning planning necessary necessary to to perform the the task safely. safely.
A person can be considered qualified with respect to certain equipment and methods by unqualified for others.
An “unqualified person” shall be trained in the inherent hazards of electricity and any related work practices that are necessary for their safety.
Training for qualified and unqualified persons will be coordinated by the OPP Safety Coordinator and the work unit supervisor. supervisor. Training will be custom customiz ized ed to to reflect the the scope of work performed within OPP.
Tra Traini ining must be provided before the employ loyee is assig ssigned duties th that involv olve work near or on electrical systems.
E ach OP OP P work unit unit shall maintain maintain a record record of all electrical electrical training training provided provided to to their employees along with a listing of all employees classified as qualified persons.
WORKING ON OR NEAR LIVE PARTS 8.1
Energized Electri cal Work Permi Permi t 8.1.1 If live parts are not placed in an electrically safe condition, work to be performed
shall be considered energized electrical work and will be performed by written permit only. 8.1.2 A copy of the “PSU OPP Energized Electrical Work Permit” can be found in Appen Ap pendi di x A of this document. document. The intent of this permit permit is to ensure that all
appropriate safety precautions are taken prior to starting energized electrical work. 8.1.3 Work related to testing, troubleshooting, and voltage measuring may be
completed without a permit permit provided appropriate appropriate safe work practices and PP PP E are used. 8.1.4 The The permit is to be origina inated by the ind individ ividu ual requestin sting g that the ene energize ized
work be be completed. completed. (This (This will normally be the the supervisor supervisor of the the employees employees who will be completing the work). The reques requestor tor is responsi responsible ble for completing Section I of the permit. 8.1.5 The The qualif lified person sons co complet leting the task ask are resp esponsib sible for com complet leting Sect Section ion
II of the permit. 8.1.6 All Energized Work Permits should be submitted to the OPP Safety Coordinator
then routed to the appropriate people for approval. 8.1.7 At least two members of the Electrical Safety Committee must approve the
permit permit prior to to beginning the the work. One of thes these e individuals must be an Electrical Electrical Engineer.
OPP 8.1.8 The The permit must be post osted in the are area where the energize ized work is taking ing place lace
for the duration of the task. 8.1.9 Copies of all energized electrical work perm permits must must be provided to to the OP P
Safety Coordinator upon completion of the task. 8.2 8.2
Approach Boundaries to Live Parts Parts 8.2.1 Observing a safe approach distance from exposed energized parts is an effective
means of maintaining maintaining electrical safety. safety. As the distance distance between between an individual and live parts increases, the potential for an electrical injury decreases. 8.2.2 Safe approach distances will be determined for all tasks in which approaching
personnel are exposed to live parts. 8.2.3 Safe approach distances to fixed live parts can be determined by referring to Appen Ap pendi di x B , “Approach Boundaries to Live Parts for Shock Protection”. This
appendix can be used to identify the Limited, imited, Res R estricted, tricted, and Prohibited Prohibited Approach Boundaries associated with various system voltages. 8.2.4 Unqualified persons may only cross the Limited Approach Boundary when they
are under the direct supervision of a qualified person. 8.2.5 Qualified persons may not cross or take any conductive object closer than the
Restricted Approach Boundary unless one of the following condition apply: •
The The qualif lified ied person son is insul sulated or guarded from the live ive parts an and no uninsulated uninsulated part of the the qualified person’s body crosses cross es the the Prohibit P rohibited ed Approach Boundary. Boundary. The The liv live parts ar are insu insula latted from the qualif alifie ied d person son and from any other conductive object at a different potential.
8.2.6 Crossing rossing the the Prohibit P rohibited ed Approach Boundary is considered considered the the same as making
contact with with energized energized parts. Qualified persons may only cross this boundary when all of the following precautions have been taken: • •
The The qualifie ified d person son has sp specif cific trainin ining g to work on ene energize ized parts. The The qualif lified ied person son has ob obtaine ined an approved Ener Energized zed Elect Electrrica ical Wo Worrk P ermit. ermit. The The qualifie ified d person son uses ses PPE app appropriat iate for working ing on energized zed parts which are rated for the voltage and energy level involved.
Other Other Precautions Precautions for Personnel Personnel Activ ities:
OPP 8.3.1 Employees shall not reach blindly into areas that might contain exposed live
parts. 8.3.2 Employees shall not enter spaces containing live parts unless illumination is
provided that allows the work to be performed safely. 8.3.3 Conductive articles of jewelry and clothing (such as watchbands, bracelets, rings,
key chains, necklaces, metalized aprons, cloth with conductive thread, metal headgear, or metal frame glasses) shall not be worn where they present an electrical contact hazard with exposed live parts. 8.3.4 Conductive materials, tools, and equipment that are in contact with any part of an
employee’s body shall be handled in a manner that prevents accidental contact with live parts. Such materials materials and equipment equipment include, but are not limited to, long conductive objects such as ducts, pipes, tubes, conductive hose and rope, metallined rules and scales, steel tapes, pulling lines, metal scaffold parts, structural members, and chains. 8.3.5 When an employee works in a confined space or enclosed space (such as a
manhole or vault) that contains exposed live parts, the employee shall use protective shields, barriers, or insulating materials as necessary to avoid contact with with these these parts. Doors, hinged panels, and the like shall be secured to prevent prevent them from swinging into employees. 9.0
PERSONAL PROTECTIVE EQUIPMENT 9.1
General General Requi Requi rements 9.1.1 Employees working in areas where electrical hazards are present shall be
provided with, and shall use, protective equipment (Arc Flash Gear) that is designed and constructed for the specific body part to be protected and for the work to be performed. 9.1.2 OP P will provide provide electrical protectiv protective e equipment equipment (Arc Flash F lash Gear) G ear) required by by this this
program at no cost cost to employees employees.. Such equipment equipment shall include 11 calorie, and 40 calorie rated Arc Flash apparel, eye protection, head protection, hand OPP is no t protection, insulated footwear, and face shields where necessary. OPP responsible for providing under layers. 9.1.3 All protective equipment shall be maintained in a safe, reliable condition by the
employee to whom it is issued. 9.1.4 Employees shall wear nonconductive head protection whenever there is a danger
of head injury from electric shock or burns due to contact with live parts or from flying objects resulting from an electrical explosion.
OPP 9.1.5 Employees shall wear nonconductive protection for the face, neck, and chin
whenever there is danger of injury from exposure to electric arcs or flashes or from flying objects resulting from an electrical explosion. 9.1.6 Employees shall wear protective equipment for the eyes whenever there is a
danger of injury from electric arcs, flashes, or from flying objects resulting from an electrical explosion. 9.1.7 Employees shall wear rubber insulating gloves where there is danger of hand
and arm injury due to contact with live parts or possible exposure to arc flash burn. 9.1.8 Where insulated footwear is used as protection against step and touch potential,
dielectric dielectric overshoes shall be required. required. Insulat Insulated ed soles shall shall not be used used as primary electrical protection. 9.1.9 F ace shields without without an arc rating rating will will not be be used for electrical electrical work. Safety
glasses or goggles must always be worn underneath face shields. 9.1.10 Additional illumination may be needed when using tinted face shields as
protection during electrical work. 9.2 9.2
Flash Flash Protection Boundary 9.2.1 P ersonal ersonal protective equipment equipment shall be provided to and used used by all employees
working within within the “F lash lash Protection P rotection Boundary”. Boundary”. 9.2.2 For systems that are 600 volts or less, the Flash Protection Boundary shall be a in Appen pendi dix x C can be used to determine the minimum of four feet. The formula in Ap exact Flash Protection Boundary for systems under 600 volts. 9.2.3 F or system systems that that are above above 600 volts, volts, the the Flash F lash P rotection rotection Boundary Boundary shall be
determined through engineering analysis. 9.2.4 The The spe specif cific protecti ctive equ equipment to be worn within the Flash Flash Prot Protecti ction
Boundary can be determined by either of the following two methods: (1) Complete a detailed flash hazard analysis under engineering supervision that
determines determines the incident ex exposure posure energy of each employee. employee. Appropriate protective clothing can then be selected based on the calculated exposure level. Criteria riteria for completin completing g such an analysis analysis can be obtained obtained from the the OP P Safety Coordinator.
OPP (2) Determine the hazard level of the task by referring to NFPA 70E Table 130.7 (C) (9) (a), “Hazard/Risk Category Classifications” ( Ap ( Appen pendi dix x D of this document). Thi This ta table also ind indica icates wh whether volta ltage-ra -rated glov loves an and/or voltage-rated tools need to be used. Once the hazard level of the task has been determined, the required PPE can then be ascertained from NFPA 70E Table 130.7 (C) (10), “Protective Clothing and PPE Matrix”. ( Appen Ap pendi di x E of this document). 9.2.5 OPP work units shall develop and maintain a listing of the specific PPE
requirements for each energized electrical task conducted by their employees Ap pendi dix x F of this document. using the form found in Appen 9.3
Flame-Re Flame-Resis sis tant Apparel App arel & Underlayers 9.3.1 FR apparel shall be visually visually inspected before each use. FR apparel that that is
contaminated contaminated or damaged damaged shall shall not be used. P rotective items items that that become become contaminated with grease, oil, flammable liquids, or combustible liquids shall not be used. 9.3.2 The The garment manufactu cturer’s in instr structio ction ns fo for car care and maint intena enance of FR app apparel
shall be followed. 9.3.3 When FR apparel is worn to protect an employee, it shall cover all ignitable
clothing and allow for movement and visibility. 9.3.4 F R apparel must must cover cover potent potentially ially exposed exposed areas as completely completely as possible. F R
shirt sleeves must be fastened and FR shirts/jackets must be closed at the neck. 9.3.5 Non-melting, flammable garments (i.e. cotton, wool, rayon, silk, or blends of
these materials) may be used as underlayers beneath FR apparel. 9.3.6 Meltable fibers such as acetate, nylon, polyester, polypropylene, and spandex
shall shall not be permitted permitted in fabric underlayers next to to the skin. skin. (An (An incidental amount of elastic used on non-melting fabric underwear or socks shall be permitted). 9.3.7 FR garments worn as outer layers over FR apparel (i.e. jackets or rainwear) must
also be made from FR material. 9.3.8 Flash suits must permit easy and rapid removal by the user. 9.4 9.4
Rubber Insulating Equipment 9.4.1 Rubber insulating equipment includes protective devices such as gloves,
sleeves, blankets, and matting.
OPP 9.4.2 Insulating equipment must be inspected for damage before each day’s use and
immediately following any incident that could have caused damage. 9.4.3 An air test must be performed on rubber insulating gloves before each use. 9.4.4 Insulating equipment found to have defects that might affect its insulating
properties must be removed from service until testing indicates that it is acceptable for continued use. 9.4.5 Where the insulating capability of protective equipment is subject to damage
during use, the insulating material shall be protected by an outer covering of leather or other appropriate material. 9.4.6 Rubber insulating equipment must be tested according to the schedule contained in Ap in Appen pendi di x G. 9.4.7 Rubber insulating equipment must be stored in an area protected from light,
temperature extremes, excessive humidity, ozone, and other substances and conditions that may cause damage. 9.4.8 No repairs to rubber insulating equipment shall be attempted without the
approval of the PSU EHS Department. 9.5 9.5
Insulated tools and materials 9.5.1 Only insulated tools and equipment shall be used within the Limited Approach
Boundary of exposed energized parts. 9.5.2 Insulated tools shall be rated for the voltages on which they are used. 9.5.3 Insulated tools shall be designed and constructed for the environment to which
they are exposed and the manner in which they are used. 9.5.4 Fuse or fuse holder handling equipment, insulated for the circuit voltage, shall be
used to remove or install a fuse if the fuse terminals are energized. 9.5.5 Ropes and handlines used near exposed energized parts shall be
nonconductive. 9.5.6 P ortable ortable ladders used for electr electrical ical work shall have nonconductive nonconductive side rails. 10.0
AL ERTING TECHNIQUES
OPP 10.1 Barricades shall be used in conjunction with safety signs to prevent or limit access to
work areas containing containing live parts. Conductive barricades shall s hall not be used where where they they might cause an electrical hazard. Barricades shall s hall be placed no no closer closer than than the the Limited Approach Boundary. 10.2 If signs and barricades do not provide sufficient protection, an attendant will be
assi assigned gned to to warn and protect protect pedestrians. The primary duty duty of the attendant attendant shall shall be to keep unqualified persons out of the work area where an electrical hazard exists. The The attendant ant sha shall remain in the area as lo long as there is a potential ial exposur sure to electrical hazards. 11.0
CONTRACT EMPLOYEES 11.1
Safety program programs s used by contractors contractors on PS P SU jobsites must meet meet or exceed all applicable guidelines of this Safety Program.
Contractors will be required to comply with applicable Safety and Health regulations such as OSHA, NFPA, EPA.
Contractors may may be required to to submit copies of their Safety Safety Program Program to the the Safety Safety Coordinator oordinator upon request.
OPP Appen Ap pendi di x A: A : Energ En ergized ized Electr Elec tr ic al Work Wo rk Permit Perm it Part Part I: To be completed by the requestor requestor or s upervisor of the job
Descript Description ion of Circuit & E quipment: ent:
J ob Location Location::
Description of Work to Be Done: J usti stifica ication of why the cir circui cuit can cannot be de-en -energized zed or the work delay layed until the next sch schedu eduled outage:
Part Part II: To be completed by the qualified person(s) completing the work
(1) Detailed description of procedure to be used in performing the above work: (2) Description of safe work practices to be employed: (3) Voltage exposure (shock hazard analysis): (4) Determination of shock protection boundaries: (5) Results of flash hazard analysis: (6) Determination of flash protection boundaries: (7) PPE required to safely perform the task: (8) Method used to restrict access to the work area: (9) Do you agree the the above work can be done safely? Qua Qualifi ified Perso Person n(s) (s): ____ __ ____ ____ __ ____ __ ____ __ ____ __ ____ __ Qua Qualifi ified Perso Person n(s) (s): ____ __ ____ ____ __ ____ __ ____ __ ____ __ ____ __ Qua Qualifi ified Perso Person n(s) (s): ____ __ ____ ____ __ ____ __ ____ __ ____ __ ____ __
Y E S (proceed to P art III) II I) NO (return to requestor) Dat Date: __ ____ __ ____ ____ __ Dat Date: __ ____ __ ____ ____ __ Dat Date: __ ____ __ ____ ____ __
Part III: To be completed by members of PSU Electrical Safety Committee Appr Ap prov ovals als:: Name Name Job Titl e Date Date
Note: Route Permit Permit to Safety Coordinator . A minimum of two committee committee members members must
approve energized work; one of these individuals must be an Electrical Engineer.
OPP Appen Ap pendi di x B: B : App A ppro ro ach Boun Bo undar daries ies to Li ve Part s for f or Shock Sho ck Protec Pro tecti ti on (All dimension s are distance from live part to employee) Nominal System Voltage (phase to phase)
Limited Appr Ap proac oach h Boundary (fixed (fixed c ircuit parts only)
Less Les s than than 50 V 50 V to 300 V 301 V to 750 V 751 V to 15 kV Over 15 kV or movable conductor
Restricted Appr Ap proac oach h Boundary (includes inadvertent movement adder)
Prohibited Approach Boundary
Not Specified Not Specified Avoid Contact ontact Avoid Contact ontact 1 foot 1 inch 2 feet, 2 inches 7 inches See NFPA 70 E Table 130.2 (C)
Limited Approach Boundary: Distance from an exposed live part within which a shock hazard
exists. An unqualified person may may not cross this boundary unless they they are continuously continuously escorted by a qualified person. Restricted Approach Boundary: Distance from an exposed live part within which there is an increased risk of shock (due to electrical arc-over combined with inadvertent movement) for personnel personnel working in close close proximity proximity to to the live part. This boundary may may only be be crosse crossed d by a qualified person who is safely insulated or guarded from the live parts. Prohibited Approach Boundary: Distance from an exposed live part within which work is considered considered the sam same as making contact contact with with the the live part. This boundary may may only be be crosse crossed d by a qualified person who has specific training to work on energized parts; has obtained an approved Energized Electrical Work Permit; and uses PPE appropriate for working on energized parts which are rated for the the voltage and energy level involved. (Note: (Note: A permit is not not required required for work related to testing, troubleshooting, and voltage measuring). Flash Flash Protection Boundary (not l isted in t able): able): Distance from exposed live parts within which a person could receive a second second degree degree burn burn if an electrical arc flash were to to occur. This boundary boundary may may only be crossed crossed by a qualified person person wearing the the appropriate appropriate PP PP E . F or systems systems that that are 600 600 volts volts are less, les s, the the Flash F lash Protect P rotection ion Boundary shall be a minim minimum um of four feet. feet. An engineering analys analysis is must be perform performed ed to determ determine ine the Flas Flash h Protection P rotection Boundary for system systems s that are above 600 volts.
OPP Appen Ap pendi di x C: Formu For mu la f or Calcul Calc ulati ation on of Flash Flas h Pr otect ot ectio ion n Bou B ound ndary ary
Dc = [2.65 x MVAbf x t]1/2 OR 1/2 Dc =[53 x MVA x t]1/2
Where: Dc = Distance in feet from an arc source for a seconddegree burn MVAbf = Bolted fault capacity available at point involved
(in mega volt-amps) MVA =Capacity rating of transformer (mega (mega volt-amps). F or transformers with MVA ratings below 0.75 MVA, multiply the transformer MVA rating by 1.25. t = Time of arc exposure (in seconds). Examples:
#1 Transform ransformer er 1000 kVA = 1.0 mVA mVA,, and breaker trip setting etting instant instantaneous aneous of 0.1 seconds seconds 1/2 Dc = (53 x 1 x 0.1)1/2
Dc = (5.3)1/2 1/2 Dc = 2.3 feet
#2 Transform ransformer er 1000kVA = 1.0 mVA mVA,, and breaker trip sett setting ing at short time time delay of 0.5 0.5 seconds seconds Dc = (53 x 1 x 0.5)1/2 Dc = (26.5)1/2 1/2 Dc = 5.1 feet Flash Protection Boundary increases with breaker trip setting
OPP Appen Ap pendi dix x D: Hazard/Ri sk Catego ry Classi Clas si fi catio cat ions ns Task Task (Assum es equipment is Hazard/Risk energized, energized, and and wor k is d one Category with in the Flash Flash Protection Boundary) Panelboard Panelboard s Rated 240 V and Below
Circuit breaker (CB) or fused switch operation with covers on CB or fused switch operation with covers off Work on energized parts, including voltage testing Remove/install CBs or fused switches Removal of bolted covers (to expose bare, energized parts) Opening hinged covers (to expose bare, energized parts)
V-rated V-rated Tool s
Panelboards or Switchboards Rated > 240 V and up to 600 V (with molded case or insulated case circuit b reakers) reakers)
CB or fused switch operation with covers on CB or fused switch operation with covers off Work on energized parts, including voltage testing
2 (*) (*)
PPE PPE Requi Requirements rements can be foun d in Appendi A ppendix xE Addi Ad diti ti onal on al Info In fo rm ation ati on:: •
V-rated Gloves are gloves rated and tested for the maximum line-to-line voltage upon which work will be done. V-rated Tools are tools that are rated and tested for the maximum line-to-line voltage upon which work will be done. 2(*) means that a double-layer switching hood and hearing protection are required for this task Ap pendi di x E. in addition to the other Hazard/Risk Category requirements of Appen Y =Yes (re (require ired) N = No (not required)
(1) 25kA short circuit current available, available, 0.03 second second (2 cycle) fault fault clearing clearing time. time. (2) F or <10kZ short circuit current available, available, the hazard/risk hazard/ris k category required may be reduced by one number.
OPP Appen Ap pendi di x E: Person Pers onal al Prot Pr otect ectiv iv e Equip Equ ipmen mentt Mat rix ri x Protective Clothing and Equipment Hazard/R Hazard/Risk isk Categor Categor y Number
Protective Systems for Haza Hazard/Risk rd/Risk Category Category (3) -1 0 1 2 3 4
Non-melting (accord ing to ASTM F 1506 1506-00 -00)) or Untreated Natural Fiber
a. T-shirt T-s hirt (short-sleeve) (short-sleeve) b. Shirt (long-sleeve) (long-sleeve) c. P ants ants (long) FR Clothing
(4) X (4)
X (4) X(4)
X (6) X(6)
(9) X (9) (9) X(9) X(9) AN
a. Long-sleeve shirt b. P ants ants c. Coverall d. J acket, acket, parka, parka, or rainwear rainwear
FR Protective Equipment
a. Flash suit jacket (multilayer) (multilayer) b. Flash suit pants (multilayer) (multilayer) c. Head protection 1. Hard hat 2. F R hard hat liner d. Eye protection 1. Safety Safety glasses glasses 2. S afety afety goggles goggles e. Face and head area protection 1. Arc-rated Arc-rated face shield, or flash suit hood 2. Flash suit hood 3. Hearing protection protection (ear canal inserts) f. Hand protection Leather Leather gloves gloves g. Foot protection Leather Leather work shoes
PPE Arc Ar c Flash Gear Gear Required Requi red
(8) X (8)
Haza Hazard rd c ategories ategories u p to 2 OPP OPP will require 11 calori calori e protection . Hazard categories over 2 OPP will require 40 calorie protection. AN =As =A s needed needed Notes:
AR =As requir required ed
AL =Select =S elect one in group group X =Minimum Minimum required required
(1) See See Table 130.7 (C) (11). Arc rating for a garment garment is expressed in cal/cm 2. (2) If If voltage-rated gloves are required, the leather protectors protectors worn external external to the rubber gloves satisfy this requirement. requirement. (3) Hazard/Risk Category Number “-1” is only defined if determined by Notes 3 or 6 of Table 130.7 (C) (9) (a). (4) Regular weight (minimum 12 oz/yd2 fabric weight), untreated, denim cotton blue jeans are acceptable in lieu of FR pants. The FR F R pants used for Hazard/Risk Hazard/R isk Category Category 1 shall have a minim minimum um arc rating of 11 cal. (5) Alternate is to use FR coveralls (minimum arc rating of 11 cal) instead of FR shirt and FR pants. (6) If the FR pants have a minimum arc rating of 11 cal, long pants of non-melting or untreated fiber are not required beneath the FR pants. (7) Alternate is to use FR coveralls (minimum arc rating of 11 cal) over non-melting or untreated natural fiber pants and Tshirt. (8) A face shield with a minimum arc rating of 11cal, with wrap-around guarding to protect not only the face, but also the forehead, ears, and neck (or alternatively, a flash suit hood), is required. (9) Alternate is to use two sets of FR coveralls (the inner with a minimum arc rating of 4cal and outer coverall with a minimum arc rating of 5) over non-melting or untreated natural fiber clothing, instead of FR coveralls over FR shirt and FR pants over non-melting or untreated natural fiber clothing.
OPP Appen Ap pendi di x F: OPP PPE PPE Requi rement rem ents s for f or Energi Ener gi zed Task s
Descript ion of Task
Hazard/Risk Hazard/Risk Category
Specific PPE PPE To Be Worn
OPP Appen Ap pendi di x G: Inspec Ins pecti ti on Schedu Sch edule le f or Rubber Rub ber Insul Ins ul ating ati ng Equip Equ ipmen mentt Type of Equipment
Upon indication indication that that insulating value is suspect suspect Upon indication indication that that insulating value is suspect suspect Before Before first first iss issue and every 12 months thereafter (*) Before Before first first issue issue and every 6 months thereafter (*) Before Before first first iss issue and every 12 months thereafter (*)
(*) – If the insulating equipment has been electrically tested but not issued for service, it may not be placed into service unless is has been electrically tested within the previous 12 months.