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1、OSHA and NFPA Requirements for Arc Flash Safety for Waste and Recycling Equipment and Facilities,Welcome!,This session will be recorded.This recording will be available on the NSWMA/WASTEC website.A question&answer session will follow presentation.Directions for asking questions will be given at tha
2、t time.All lines will be muted during call.If you need assistance during call,press*0 for an operator.You may chat questions to speaker at any time,but they probably wont be answered until Q&A period commences.,Our Speaker today:,David MalterMalter Associates,Inc.7212 Millburne Court Bull Valley,IL
3、60050Business Phone(815)363-5512 Fax(815)363-5514,OSHA Requirements for Electrical Safe Work Practices,OSHA Requirements,OHSA uses its Electrical Safe Work Practices Standards for General Industry(Manufacturing,Retail and Service Industries)and Construction;and The General Duty Clause.,Selection and
4、 Use of Electrical Work Practices,1910.333(a)General Safety-related work practices shall be employed to prevent electric shock or other injuries resulting from either direct or indirect electrical contacts,when work is performed near or on equipment or circuits which are or may be energized.The spec
5、ific safety-related work practices shall be consistent with the nature and extent of the associated electrical hazards.,Selection and Use of Electrical Work Practices,1910.333(a)(1)Deenergized parts“Energized parts to which an employee may be exposed shall be deenergized before the employee works on
6、 or near them,unless the employer can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations.Energized parts that operate at less than 50 volts to ground need not be deenergized if there will be no increased exposu
7、re to electrical burns or to explosion due to electric arcs.,Selection and Use of Electrical Work Practices,1910.333(a)(1)Deenergized parts“(continued)Examples of increased or additional hazards include interruption of life support equipment,deactivation of emergency alarm systems,shutdown of hazard
8、ous location ventilation equipment,or removal of illumination for an area.,Selection and Use of Electrical Work Practices,1910.333(a)(1)Deenergized parts“(continued)Examples of work that may be performed on or near energized circuit parts because of infeasibility due to equipment design or operation
9、al limitations include testing of electric circuits that can only be performed with the circuit energized and work on circuits that form an integral part of a continuous industrial process in a chemical plant that would otherwise need to be completely shut down in order to permit work on one circuit
10、 or piece of equipment.,Selection and Use of Electrical Work Practices,1910.333(a)(2)“Energized parts“If the exposed energized parts are not deenergized(i.e.,for reasons of increased or additional hazards or infeasibility),other safety-related work practices shall be used to protect employees who ma
11、y be exposed to the electrical hazards involved.Such work practices shall protect employees against contact with energized circuit parts directly with any part of their body or indirectly through some other conductive object.The work practices that are used shall be suitable for the conditions under
12、 which the work is to be performed and for the voltage level of the exposed electric conductors or circuit parts.,Selection and Use of Electrical Work Practices,1910.333(b)(1)Working On or Near Exposed Deenergized Parts Conductors and parts of electric equipment that have been deenergized but have n
13、ot been locked out or tagged in accordance with paragraph(b)of this section shall be treated as energized parts,and paragraph(c)of this section applies to work on or near them.,Selection and Use of Electrical Work Practices,1910.333(b)(2)Lockout and Tagging While any employee is exposed to contact w
14、ith parts of fixed electric equipment or circuits which have been deenergized,the circuits energizing the parts shall be locked out or tagged or both in accordance with the requirements of this paragraph.,Selection and Use of Electrical Work Practices,1910.333(c)Work on Energized EquipmentOnly quali
15、fied persons may work on electric circuit parts or equipment that have not been deenergized under the procedures of paragraph(b)of this section.Such persons shall be capable of working safely on energized circuits and shall be familiar with the proper use of special precautionary techniques,personal
16、 protective equipment,insulating and shielding materials,and insulated tools.,Selection and Use of Electrical Work Practices,1910.335(a)(1)(i)“Personal Protective Equipment Employees working in areas where there are potential electrical hazards shall be provided with,and shall use,electrical protect
17、ive equipment that is appropriate for the specific parts of the body to be protected and for the work to be performed.,Selection and Use of Electrical Work Practices,1910.335(a)(1)(ii)“Personal Protective Equipment Protective equipment shall be maintained in a safe,reliable condition and shall be pe
18、riodically inspected or tested,as required by 1910.137.,General Duty Clause,Each employer shall furnish.a place of employment which is free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees.”,Arc Blast and Arc Flash are Recognized Hazards
19、,NFPA 70E is a nationally recognized consensus standard which provides guidance for protection against the hazards of Electrical Shock,Arc Blast and Arc Flash.Arc Blast and Flash have the potential to cause serious physical harm.,Arc Blast and Arc Flash are Recognized Hazards,An arc flash is the sud
20、den release of electrical energy through the air when a high-voltage gap exists and there is a breakdown between conductors.-NIOSH DEFINTIONAn arc flash gives off thermal radiation(heat)and bright,intense light that can cause burns.Temperatures have been recorded as high as 35,000 F.High-voltage arc
21、s can also produce considerable pressure waves by rapidly heating the air and creating a blast.,NFPA 70E Electrical Safety Guidance,90.1 The purpose of this standard is to provide a practical safe working area for employees relative to the hazards arising from the use of electricity.,NFPA 70E Requir
22、ements for Working on or Near Energized Parts,Perform an Electrical Hazard(Shock and Flash)Analysis;Select Personal Protective Equipment and Tools;Ensure task-specific training;Complete an Energized Electrical Work Permit;andConduct a job briefing.,Working on or Near Energized Parts,Working on energ
23、ized parts means coming in contact with energized electrical conductors or circuit parts with the hands,feet,or other body parts,with tools,probes,or with test equipment,regardless of the personal protective equipment a person is wearing.There are two categories of“working on”:Diagnostic(testing)is
24、taking readings or measurements of electrical equipment with approved test equipment that does not require making any physical change to the equipment;andRepair is any physical alteration of electrical equipment(such as making or tightening connections,removing or replacing components,etc.).,Working
25、 on or Near Energized Parts in Compactors,Balers and Other Waste and Recycling Equipment,Components inside the main panel that would typically need to be checked,tested,or for trouble shooting,while the system is HOT are:StarterTransformerPC ControllerTimersRelaysPower strip&wiring Motor rotationPre
26、ssure checks/amperage draw,Electrical Hazard Analysis,Conduct a Shock Hazard Analysis;Establish Shock Protection Boundaries;Conduct a Flash Hazard Analysis;Establish a Flash Protection Boundary;and Select the Appropriate Personal Protective Equipment and Tools.,Shock Hazard Analysis,Requires employe
27、rs to:Determine the voltage to which personnel will be exposed;Boundary requirements;andPersonal protective equipment necessary in order to prevent electrical shock.,Flash Hazard Analysis,Requires employers to document the incident energy exposure of the worker to a potential arc flash incident in u
28、nits of calories per square cubic centimeter(cal/cm2)The incident exposure level is based on the working distance of the employees face and chest areas from a perspective arc source for the specific task to be performed.A“Hazard/Risk Category Chart System”is permitted to be used in lieu of the detai
29、led flash hazard analysis using the calculation approach.,Distance Boundaries,Two types include:Approach Boundaries-used to reduce shock hazard(Limited,Restricted and Prohibited);and Flash Protection Boundaries-used to reduce arc flash hazards and may reduce arc blast hazards.,NFPA Boundary Definiti
30、ons,Boundary,Limited Approach.An approach limit at a distance from an exposed energized electrical conductor or circuit part within which a shock hazard exists.Boundary,Restricted Approach.An approach limit at a distance from an exposed energized electrical conductor or circuit part within which the
31、re is an increased risk of shock,due to electrical arc over combined with inadvertent movement,for personnel working in close proximity to the energized electrical conductor or circuit part.,NFPA Boundary Definitions,Boundary,Prohibited Approach.An approach limit at a distance from an exposed energi
32、zed electrical conductor or circuit part within which work is considered the same as making contact with the electrical conductor or circuit part.Boundary,Arc Flash Protection.When an arc flash hazard exists,an approach limit at a distance from a prospective arc source within which a person could re
33、ceive a second degree burn if an electrical arc flash were to occur.,Arc Flash and Arc Blast,Approach Boundaries to Energized Parts,Limited-42 inches*A shock protection boundary that is not to be crossed by unqualified persons unless escorted by a qualified person.,For System Voltage up to 750 V,Res
34、tricted-12 inchesA shock protection boundary to be crossed by only qualified persons which requires the use of shock protection techniques and equipment when crossed.,Prohibited-1 inchA shock protection boundary to be crossed by only qualified personnel which when crossed by a body part or object re
35、quires the same protection as if direct contact is made with a energized part.,*3.5 foot(42”)for an exposed fixed circuit part and 10 foot for an exposed movable conductor.,Approach Boundaries to Energized Parts,Flash Protection Boundary:Burns,For System Voltage of 600 volts or less*,The Arc Flash P
36、rotection Boundary will be 4.0 ft,based on the product of clearing time of 2 cycles(0.033 sec)and the available bolted fault current of 50 kA or any combination not exceeding 100 kA cycles(1667 ampere seconds).When the product of clearing times and bolted fault current exceeds 100 kA cycles,the Arc
37、Flash Protection Boundary must be calculated.,Flash Protection Boundary:Burns,(1)Voltage Levels Between 50 Volts and 600 Volts.In those cases where detailed arc flash hazard analysis calculations are not performed for systems that are between 50 volts and 600 volts,the Arc Flash Protection Boundary
38、shall be 4.0 ft,based on the product of clearing time of 2 cycles(0.033 sec)and the available bolted fault current of 50 kA or any combination not exceeding 100 kA cycles(1667 ampere seconds).When the product of clearing times and bolted fault current exceeds 100 kA cycles,the Arc Flash Protection B
39、oundary shall be calculated.(2)Voltage Levels Above 600 Volts.At voltage levels above 600 volts,the Arc Flash Protection Boundary shall be the distance at which the incident energy equals 5 J/cm2(1.2 cal/cm2).For situations where fault-clearing time is equal to or less than 0.1 sec,the Arc Flash Pro
40、tection Boundary shall be the distance at which the incident energy level equals 6.24 J/cm2(1.5 cal/cm2).For information on estimating the Arc Flash Protection Boundary,see Annex D.,Flash Protection Boundary:Annex D,Protective Clothing and Other PPE for Application with an Arc Flash Hazard Analysis.
41、,Where it has been determined that work will be performed within the Arc Flash Protection Boundary identified by 130.3(A),one of the following methods shall be used for the selection of protective clothing and other personal protective equipment:Incident Energy Analysis.The incident energy analysis
42、shall determine,and the employer shall document,the incident energy exposure of the worker(in calories per square centimeter).Hazard/Risk Categories.The requirements of 130.7(C)(9),130.7(C)(10),and 130.7(C)(11)shall be permitted to be used for the selection and use of personal and other protective e
43、quipment.,Incident Energy Analysis,The incident energy analysis shall determine,and the employer shall document,the incident energy exposure of the worker(in calories per square centimeter).The incident energy exposure level shall be based on the working distance of the employees face and chest area
44、s from a prospective arc source for the specific task to be performed.Arc-Rated FR clothing and other personal protective equipment(PPE)shall be used by the employee based on the incident energy exposure associated with the specific task.Recognizing that incident energy increases as the distance fro
45、m the arc flash decreases,additional PPE shall be used for any parts of the body that are closer than the distance at which the incident energy was determined.,Equipment Labeling,Equipment shall be field marked with a label containing the available incident energy or required level of PPE.,Distance
46、Boundaries,Unqualified Persons must:Not cross the Flash Protection Boundary of 48”unless they are wearing appropriate shock and flash PPE;Not cross the Limited Approach Boundary of 42”unless they are escorted and closely supervised by a qualified person;andNever cross the Restricted Approach Boundar
47、y of 12”.,For System Voltage up to 600 V,Distance Boundaries,Qualified Persons must:Be trained and qualified to perform the task/job and to understand the potential hazards in crossing the Limited Approach and Flash Protection Boundaries;and Not cross the Limited Approach and Flash Protection Bounda
48、ries unless he/she is wearing the appropriate personal protective equipment and using the correct tools.,Flash Hazard Analysis:Hazard/Risk Category Chart System,Flash Hazard Analysis:Hazard/Risk Category Chart System,Flash Hazard Analysis:Hazard/Risk Category Chart System,Flash Hazard Analysis:Hazar
49、d/Risk Category Chart System,Flash Hazard Analysis:Hazard/Risk Category Chart System,Flash Hazard Analysis:Hazard/Risk Category Chart System,Protective Clothing and Personal Protective Equipment,Protective Clothing and Personal Protective Equipment,Protective Clothing Characteristics,Standards on Pr
50、otective Equipment,NFPA 70E V Rated Gloves,V-Rated gloves are required for energized electrical work.These gloves are rated for the maximum line to line voltage upon which work will be done.,Class 0,Class 2,ASTM D-120 applies to electrical hazard protection for gloves,NFPA 70E V Rated Gloves,NFPA 70
