/ 1.0 m 3 ft. 6 in. . In Section 130.4(D) of NFPA 70E, there are two shock protection boundaries that apply to personnel approaching exposed energized electrical conductors or circuit parts:. The PAB was developed by the National Fire Protection Association (NFPA . Restricted Approach Boundary: An approach limit at a distance from an exposed energized electrical conductor or circuit 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 energized electrical conductor or circuit part. Restricted Approach: An approach limit at a distance from an exposed live part which there is an increased risk of shock. The Restricted Approach Boundary (RAB) is the approach limit for qualified persons to exposed, energized electrical components where there is an increased likelihood of electric shock due to electrical arc-over combined with inadvertent movement. The tables below show the hazard/risk categories for several common tasks and describe the protective equipment required for each of the categories. THE LIMITED APPROACH BOUNDARY The limited approach boundary is a distance from the employee to an exposed energized circuit part within which a shock hazard exists. The restricted approach boundary is the closest distance to exposed live parts a qualified person can approach without proper PPE and tools. Limited and restricted approach boundaries for shock protection are described in Mandatory Appendix C for AC and DC Systems. This distance is where there is an increased risk of electrical shock by either an arc flash or inadvertent movement. Restricted Approach: An approach limit at a distance from an exposed live part which there is an increased risk of shock. • Access to and egress from as area with energized electrical equipment if no electrical work is . This results in using the 151 V-750 V row in the table. Limited approach boundary . PROHIBITED APPROACH BOUNDARY A shock protection boundary to be . Δ= Text deletions and !gure/table revisions. Let's go into a little detail on each of these. Prohibited Approach (inner boundary): A distance from an exposed part which is New table provides maximum use voltages for rubber insulating gloves and provides ready access to users of this standard and for the proper application of 130.7(C)(7)(a). This distance is not common between equipment. (2) Transformer MVA (and base MVA) = 10 MVA. 3.0 m 3 ft 6in 1.0 m Avoid Contact Approach boundaries are specified in NFPA 70E+ Table 130.4 (1) (2) (3) (4) Nominal System Limited Approach Limited Approach Restricted Approach Voltage Range . Limited, restricted and prohibited approach boundaries must be determined in order to identify safe approach distances and the precautions required to minimize the possibility of shock. (See Clause 4.3.7.4.2.) Restricted 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 . Restricted Approach Boundary. 130.4(C)] National Fire Protection Association Report Page 2 of 115 All distances are from energized conductor or circuit part to employee. The Prohibited Approach Boundary was . Use NFPA 70E-2021 Table 130.4(E)(b) for direct current. 2. 9. However, the table further clarifies that this does not include opening equipment or SWGR (Switchgear) doors or covers that expose energized conductors, which specifically increases the likelihood of the occurrence of an arcing fault and arc flashover. The boundaries that focus on protecting workers from electrical shock and electrocution; Limited Approach, and Restricted Approach, are determined by referencing the NFPA 70E Tables 130.4(C)(a) for AC systems and 130.4(C)(b) for DC systems. The Restricted Approach Boundary listed in the table represents the closest that qualified workers should approach exposed live parts operating at 50 V or more unless: • They are insulated or . They can be found in Table 130.4(D)(a) for AC and 130.4(D)(b) for DC circuits. For voltages above 600 volts, the minimum approach Boundary, Restricted Approach. The restricted approach boundary is 1 foot. No qualified person shall approach or take any conductive object closer to exposed live parts operating at 50 volts or more than the Restricted Approach Boundary set forth in Table 130.2(C), unless any of the following apply: (1) The qualified person is . The limited approach boundary is a distance from the employee to an exposed energized circuit part within which a shock hazard exists. The common nominal AC voltages that a maintenance person would be working on of 120, 208, 220, 240, 277, 380, and 480 all have a limited approach boundary of 42 inches. • Thermography and visual inspection if the restricted approach boundary is not crossed. The Restricted Approach Boundary is the distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock due to electrical arc-over combined with . 2. (o) Hazard/risk category 0 has been deleted. They can be found in Table 130.4(D)(a) for AC and 130.4(D)(b) for DC circuits. Furthermore, for arc flash protection, the incident energy is evaluated at a 455 mm (18 in) distance and will inform of the PPE to be worn. 12-NFPA 70E-2013 [Section No. The typical nominal AC voltages that a maintenance person would be working on of 120, 208, 220, 240, 277, 380, and 480 all have a limited approach boundary of 42 inches. Table 130.5(C) indicates the task "For ac systems, work on energized electrical conductors and circuit parts, including voltage testing" always requires the use of arc-rated clothing and PPE to perform that task, which . Avoid Contact Avoid Contact . MVA should be there… or KVA (divide KVA/1000 to get MVA). Limited approach boundary Nominal system voltage range, phase to phase Exposed movable conductor Exposed fixed- circui t part Restricted approach boundary (allowing for accidental movement) Prohibited approach boundary 0 to 50 volts Not specified Not specified Not . NFPA 70E 2018: Table 130.4 (D) (b) Direct Current (DC) Voltage Systems Nominal System Voltage (phase to phase) Limited Approach Boundary Restricted Approach Boundary; Includes Inadvertent Movement Adder Exposed Movable Conductorc Exposed Fixed Circuit Part Less than 50V Not specified 50V to 300V 10 ft 3 ft 6 in Avoid Contact Apply Proper Shock Protection Techniques NFPA 70E® Approach to Considering DC Hazards DC ELECTRICAL HAZARD ANALYSIS Shock Hazard Analysis For exposed 480 VAC energized conductors and using NFPA 70E Table 130.2(C) or the Shock Protection Boundaries and PPE Fermilab Summary table for NFPA 70E, the Restricted Approach Boundary for shock protection is a. Refer to the image of Table130.4(D)(a) to answer the question below. Restricted Approach Boundaries on AC systems are further defined in Table 130.4 (D)(a) and are; approach boundary. C.1.2 Qualified Persons, Safe Approach Distance. 1.0 m (3 ft. 6 in.) Approach Boundaries for Alternating Current (AC) Shock Protection . The Nominal System Voltage range in Table 1A - Approach boundaries for ac systems was revised in the second row from 50 - 300 Vac to 50 - 150 Vac. […] (p) The requirement to use insulated tools or handling equipment has been changed from the limited approach boundary to restricted approach boundary. Limited Approach Boundary. The arc flash boundary is calculated to 1.2 calories/cm2 of incident energy. A person crossing this line enters into restricted space. The boundaries that focus on protecting workers from electrical shock and electrocution; Limited Approach, and Restricted Approach, are determined by referencing the NFPA 70E Tables 130.4(C)(a) for AC systems and 130.4(C)(b) for DC systems. Flash Protection Boundary (FPB) The FPB is a safe approach distance from energized equipment or parts. Boundary, Restricted Approach An approach limit at a distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock, due to electrical arc-over combined with inadvertent movement, for personnel working in close proximity to the energized electrical conductor or circuit part. The prohibited approach boundary is the most high-risk of three approach boundaries used to delineate risk-level zones around electrical equipment. Electrical PPE is required when working on or near equipment within the limited or restricted approach boundary. An approach limit at a distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electric shock, due to electrical arc-over combined with inadvertent movement. Response Message: Public Comment No. What about the difference between the Arc Flash Protection Boundary and the Shock Protection Boundary?To help you visualize these boundaries, PowerStudies presents a handy printout, "A Quick . the limited approach boundary with an exposed movable conductor is . Go find the transformer and look at the nameplate. N = New material. The restricted approach boundary distances were adjusted for consistency throughout the tables. Tables 4B and 4C continue to identify an arc flash boundary distance for each type of equipment. t is the time that the arc flash is . REMOVED "for personnel working in close proximity In the example, the limited approach boundary for an exposed fixed circuit part is 3 foot, 6 inches. Prohibited Approach: (inner boundary): A distance from an exposed part which is considered the same as making contact with the live part. 9. • = Section deletions. 1 Inch b. . N Table 130.4(D)(a) Shock Protection Approach Boundaries to Exposed Energized Electrical Conductors or Circuit Parts for The limited, restricted and prohibited approach boundaries are voltage-dependent and defined by NFPA 70E Table 130.2(C). The Restricted Approach Boundary is closer to live parts and may only be crossed by qualified persons. Restricted approach boundary. •Table 130.7(C)(15)(A)(a) •Arc Flash PPE is not required* for: -Voltage testing on individual battery cells or individual multi-cell units -Removing battery intercell connector covers -Performing infrared thermography and other noncontact inspections outside the restricted approach boundary. All of these limited approach boundaries are determined in tables outlined in NFPA 70E and CSA Z462, and all are based upon the voltage of the equipment. Limited Approach Boundary (shock hazard exists) 4. Flash Protection Boundary (FPB) The FPB is a safe approach distance from energized equipment or parts. NFPA 70E Reference Tables 2PAGE- 12-2018 130.5 ARTICLE 130 — WORK INVOLVING ELECTRICAL HAZARDS 70E-24 Shaded text = Revisions. (C) Approach to Exposed Live Parts Operating at 50 Volts or More. NFPA 70E/CSA-Z462 -The Standard for Electrical Safety in the Workplace. Under NFPA 70E, there are three boundaries that are observed—limited approach, restricted approach, (the shock protection boundaries) and arc flash boundary. Restricted approach boundary . Help: NFPA 70E Table 130.4(D)(a) NFPA 70E Arc Flash and Shock Hazard Boundaries Explained This question was marked incorrect, when in fact it is 10 feet for the limited approach boundary for 35 kV, the link that is attached to the question marked incorrect takes you to the table that shows the 10 foot boundary. Prohibited approach boundary To cross the Restricted Approach Boundary into the Restricted Space, the qualified person, who has completed required training, must wear appropriate personal protective equipment (PPE).Also, he must have a written approved plan for the work that they will perform and plan the work to keep all parts of the body out of the Prohibited Space.This boundary is determined from NFPA Table 2-1.3.4 . b <100 V Not Specified Not Specified Not Specified Not Specified 100 V - 300 V 3.0 m (10 ft. 0 in.) It is estimated that more than 90% of all DC systems likely to be encountered are in one of the three ranges below 1,000VDC. / 1.5 m Not specified Avoid contact 1 ft. 0 . - Determined exclusively on the nominal voltage. Restricted Approach Boundary Shock Boundaries 150-750 V Qualified workers may enter restricted space only with appropriate protection 12" 42" 21 Approach Distances for Qualified Employees (Approach Boundaries- NFPA 70E Table 130.4(D)(a) The restricted approach boundary represents the minimum distance unprotected skin can The limited approach boundary; The restricted approach boundary; These boundaries are determined from using two separate tables: Table 130.4(D)(a) is used for the distances associated with AC system voltages. To cross the Restricted Approach Boundary into the Restricted Space, the qualified person, who has completed required training, must wear appropriate personal protective equipment (PPE).Also, he must have a written approved plan for the work that they will perform and plan the work to keep all parts of the body out of the Prohibited Space.This boundary is determined from NFPA Table 2-1.3.4 . Crossing this boundary to perform work while the equipment is still powered also requires an energized electrical work permit, which includes a specific plan of action, a list of protective steps to be taken, and supervisory approval. •No qualified person shall approach or take any conductive object closer to exposed energized electrical conductors or circuit parts operating at 50 volts or more than the restricted approach boundary set forth in Table 130.4(C)(a) and Table 130.4(C)(b), unless any of the following apply: Table D.2 tabulates the results of calculating the arc flash boundary for each part of the system. Restricted Approach Boundary~ 12 inches. Best practice is to stay 12" or more away from the hazard. Table 2: Approach Boundaries to Energized Electrical Conductors (for Direct Current Voltages) Nominal Voltage Limited Approach Boundary* Restricted Approach Boundary Prohibited Approach Boundary 100 to 300 Volts 3.5 ft Avoid Contact Avoid Contact 301 to 1000 Volts 3.5 ft 1 ft 0 in 0 ft 1in This table identifies four conditions at 11 DC voltage ranges between 100V and 800kV. Determine Nearest Approach Boundary To Be Crossed Based on Table 130.4(C)(b) Approach Boundaries to Energized Electrical Conductors or Circuit Parts for Shock protection, Direct-Current Voltage Systems 3. Protection Table 130.4(D)(a) APPENDIX "E" Page 17 and (Table 130.4(D)(b) APPENDIX "F" . Restricted Approach Boundary - The Restricted Approach Boundary (RAB) is identified as the "distance from an exposed energized electrical conductor or circuit part within which there is an increased likelihood of electrical shock, due to arc-over combined with inadvertent movement". As the foremost consensus standard for electrical safety in the workplace, NFPA 70E is the primary resource for employers to use in determining how to comply with OSHA's electrical safety regulations. Table excerpts taken from NFPA 70E Tables 130.4(C)(a) and (b). Therefore, personnel must obtain a risk assessment before the prohibited boundary is crossed. The limited approach boundary; The restricted approach boundary; These boundaries are determined from using two separate tables: Table 130.4(D)(a) is used for the distances associated with AC system voltages. Only qualified employees and escorted unqualified employees may cross Restricted - Only qualified employees may cross. Limited Approach Boundaries are based on the voltage levels according to NFPA and are taken from the Shock Approach Boundaries Table. 4.1 Limited Approach Boundary 8. (Table Method) may only be done by a Qualified Person. See original tables for additional information. That's the distance where a worker without appropriate PPE would receive second-degree burns. When working within this boundary, must use special precautionary techniques and PPE When the arc flash boundary is the . The restricted approach boundary is used to prevent injury due to electrical shock and arc flashes. TABLE 4 Approach Boundariesa Energized Electrical Conductors or Direct-Current Voltage Systems to Circuit Parts for Shock Protection, Nominal Potential Difference Exposed Mov Limited Approach Boundary Restricted Approach Boundary; Includes Inadvertent Movement able Conductorb Exposed Fixed Circuit Part . Where there is a need for an unqualified person(s) to cross the limited approach boundary, a qualified person shall advise him or her of the possible hazards and continuously escort the unqualified person(s) while inside the limited . Sometimes this boundary is the furthest one from the exposed equipment, other times the limited approach boundary is the furthest out. . - Concern is a shock hazard. For this calculation, based on Table D.2, the following results are obtained: (1) Calculation is made on a 4160-volt bus. 24 inch Flash Hazard Boundary 3 cal/cm•2 Flash Hazard at 18 inches 1… PPE Level, 1 Layer 6 oz Nomex ®, Leather Gloves Faceshield 480 VAC Shock Hazard when Cover is removed 36 inch Limited Approach 12 inch Restricted Approach - 500 V Class 00 Gloves 1 inch Prohibited Approach - 500 V Class 00 Gloves Equipment Name: Slurry Pump Starter! C.1.2.2 For a person to cross the limited approach boundary and enter the limited space, he or she must be qualified to perform the job/task. The contents of Clause 4.3.4 were reorganized to be under Clause titles limited approach boundary and restricted approach boundary to provide clarity and ease of use. A Quick Guide to NFPA 70E-2015 and CSA Z462-2015 Approach Boundaries for Arc Flash and ShockDo you understand the differences between the Restricted Approach Boundary and the Limited Approach Boundary? Therefore, personnel must obtain a risk assessment before the prohibited boundary is crossed. The two lower-risk approach boundaries are the restricted approach boundary and the limited approach boundary (lowest risk). For DC shock protection, the limited, restricted, and prohibited approach boundaries are now defined in NFPA 70E-2012 Table 130.4(C)(b). / 1.5 m 5 ft. 6 in. JADE Learning, 2012 Nominal System Voltage Range, Phase to Phase Limited Approach Boundary - Exposed Movable Conductor Limited Approach be provided, along with a review of the tables used to determine the Limited and Restricted Approach Boundaries and tables and calculation methods used to determine the Arc Flash Boundary and for determining proper personal protective equipment (PPE). prohibited approach boundary begins with opening of cabinet and/or enclosure. NFPA 70e ® defines the limited approach boundary (also known as the flash protection boundary) as the farthest point at which a shock hazard exists. Inside this boundary, accidental movement can put a part of your body or conductive tools in contact with live parts or inside the prohibited approach boundary. The shock hazard boundaries are dependent on the system voltage and can be found in Table 130.4 (D). What is the limited approach boundary? What is the Limited Approach Boundary? 130.4(D) Approach by Unqualified Persons • (2) Entering the Limited Approach Boundary. RESTRICTED APPROACH BOUNDARY Restricted approach boundary is boundary near brought out live parts that may be violated only by "qualified" staff using adequate shock prevention methods and tools. Only qualified people may cross this boundary. Limited Approach Boundary: An unqualified person shall maintain a minimum approach distance of 4 feet from all energized equipment for voltages of less than 600 volts, unless accompanied by a qualified person.
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