in distance) MAD, the answer is, “No thanks, it would be illegal to do so.” September –October 2015 OSHA’s 1910.269 Revision (Continued from page 1) Table R-6 - Alternative Minimum Approach Distances (MAD) for Voltages of 72.5 kV and Less 1 Nominal voltage Distance (kV) … Back to Electric Power Generation, Transmission and Distribution Standard | Minimum Approach Distance Calculator Text Version. Minimum Approach Distances (MAD) Minimum Approach Distances (MAD) The final rule updated OSHA’s default values for transient over voltages (TOV), selecting far more conservative values. If a 269-qualified worker needs to do a job within the minimum approach distance, he or she must use proper work techniques and the proper tools, and must wear appropriately-rated PPE. Typically known as the ten foot rule, non qualified workers cannot approach energized equipment to perform non electrical work at closer than ten feet or more. • Under no circumstance shall nonqualified personnel operate equipment closer than the minimum approach distance to energized aerial facilities regardless of the qualifications of others on the job, or the protection placed on the energized equipment. (46 cm). 2Employers may use the minimum approach distances in Table V-6, except that the employer may not use the minimum approach distances in Table V-6 for phase-to-phase exposures if an insulated tool spans the gap or if any large conductive object is in the gap. The minimum approach distance calculator is for use with phase-to-phase system voltages exceeding 72.5 kilovolts only. (a) The employer determines that it is infeasible to do the work without breaching the minimum approach distance under Table A of § 1926.1408. 800-321-6742 (OSHA) 0.011 otherwise, VL-G = phase-to-ground rms voltage, in kV, T = maximum anticipated per-unit transient overvoltage; for phase-to-ground exposures, T equals TL-G, the maximum per-unit transient overvoltage, phase-to-ground, determined by the employer under paragraph (c)(1)(ii) of [29 CFR 1926.960 or paragraph (l)(3)(ii) of 29 CFR 1910.269]; for phase-to-phase exposures, T equals 1.35TL-G + 0.45, A = altitude correction factor from Table V-4, M = 0.31 m, the inadvertent movement factor. Please click the button below to continue. Reduced air pressure at high altitudes causes a reduction in the electrical strength of an air gap. A minimum safe approach distance (MSAD) of 10 feet must be maintained between any portion of a scaffold system, forklift or aerial lift and any energized, uninsulated electrical component. TTY TTY www.OSHA.gov, Occupational Safety and Health Administration Table A Power line voltage – nominal kV, alternating current Minimum Approach Distance (feet) Up to 50 10 1 Employers may use the minimum approach distances in this table provided the worksite is at an elevation of 900 meters (3,000 feet) or less. (c) Minimum clearance distance. Washington, DC 20210 DOES THE NESC HAVE A PROBLEM? 1Employers may use the minimum approach distances in this table provided the worksite is at an elevation of 900 meters (3,000 feet) or less. OSHA does not allow an unqualified person to come within how many feet of an energized electrical circuit? 1 Employers may use the minimum approach distances in this table provided the worksite is at an elevation of 900 meters (3,000 feet) or less. It is a central element of OSHA’s standard for Electric Power Generation, Transmission and Distribution and employers have the responsibility to establish minimum approach distances based on OSHA’s formula for voltages over 72.6 kilovolts (29 CFR 1910.269). The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. If employees will be working at elevations greater than 900 meters (3,000 feet) above mean sea level, the employer shall determine minimum approach distances by multiplying the distances in this table by the correction factor in Table - 4 corresponding to the altitude … Back to Minimum Approach Distance Calculator | Text-Version Calculator Version. However, the employee would have to keep his or her chest and other insulated body parts at least 2 feet, 1 inch away from the parts energized at 7200 volts. For lines with voltages higher than 50kV, the required distance is even greater (see below). TTY ". For voltages up to 72.5 kV, the default distances are the same as proposed. Occupational Safety and Health Administration The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. What is the distance? 3. Erect and maintain an elevated warning line, barricade, or line of signs, in view of the operator, equipped with flags or similar high-visibility markings, at 20 feet from the power line (if using Option (2) of this section) or at the minimum approach distance under Table A (see § 1926.1408) (if using Option (3) of this section). OSHA provides a minimum approach distance calculator on its website and in the standard. Minimum Approach Distance Calculator You can use this page to calculate minimum approach distances for phase-to-phase system voltages exceeding 72.5 kilovolts in accordance with 29 CFR 1910.269 and 29 CFR Part 1926, Subpart V, as follows: As a result, exposed metal components such as D-rings and buckles used on arc flash fall arrest equipment are still Over 750V, not over 2kV 1 ft. 6 in. Cranes and derricks that approach working distance within 20 feet of power lines with operating voltages up to 350 kV, or within 50 feet of power lines with voltages greater than 350 kv, are mandated to take “encroachment prevention measures.”. If employees will be working at elevations greater than 900 meters (3,000 feet) above mean sea level, the employer shall determine minimum approach distances by multiplying the distances in this table by the correction factor in Table 2940.2-7 corresponding to the … — 1926.1408 (a)(2)(iii) If a crane is going to operate within 20 feet of an overhead power line up to 350 kV, do the following: NOTE: Not applicable to utility owner/operators. 269 (x). [See 29 CFR 1926.960.] The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Under Table R-6, the minimum approach distance for a 25 kV system is 2 feet, 4 inches for phase-to-ground exposures, and 2 feet, 7 inches for phase-to-phase exposures. (30.5 cm). See OSHA Standards 29 CFR 1926.1400. 200 Constitution Ave NW 200 Constitution Ave NW also be trained in minimum approach distances and how to maintain them. Please click the button below to continue. www.OSHA.gov. 800-321-6742 (OSHA) You can use this page to calculate minimum approach distances for phase-to-phase system voltages exceeding 72.5 kilovolts in accordance with 29 CFR 1910.269 and 29 CFR Part 1926, Subpart V, as follows: The calculator provides the minimum approach distance, in feet or meters (depending on your selection), for phase-to-ground and phase-to-phase exposures. Significant Changes to 1910.269 Voltage range (phase to phase) Minimum approach distance _____ 300V and less Avoid Contact . Operations in which any part of the crane/derrick, load line or load (including rigging and lifting accessories) is either closer than the minimum approach distance under Table 4 of an energized power line or the power line voltage is undetermined and the crane/derrick load line or load is within 20 feet from the power line is prohibited, except where you demonstrate that all of the following requirements are met: Thank you for visiting our site. (b) The employer determines that, after consultation with the utility owner/operator, it is infeasible to deenergize and ground the power line or relocate the power line. For phase-to-phase system voltages of 50 V to 300 V: 1, For phase-to-phase system voltages of 301 V to 5 kV: 1, For phase-to-phase system voltages of 5.1 kV to 72.5 kV: 1, 4, For phase-to-phase system voltages of more than 72.5 kV, nominal: 2, 4, C = 0.01 for phase-to-ground exposures that the employer can demonstrate consist only of air across the approach distance (gap), Occupational Safety and Health Administration, Back to Electric Power Generation, Transmission and Distribution Standard, Severe Storm and Flood Recovery Assistance. Footnote (1) Enter the maximum anticipated per-unit transient overvoltage, phase-to-ground, determined through an engineering analysis or assume a maximum anticipated per-unit transient overvoltage, phase-to-ground, in accordance with the following table: * Accessibility Assistance: Contact OSHA's Directorate of Standards and Guidance at (202) 693-1950 for assistance accessing this content. 200 Constitution Ave NW Table R-4—Electrical Component of the Minimum Approach Distance at 5.1 to 72.5 kV [D; In meters] Washington, DC 20210 The table R-6 minimum approach distance, for this scenario, would be 2 feet, 1 inch, rather than 2 feet, 2 inches because the described employee exposure appears to be phase-to-ground. As TOV is one of the major factors for calculating MAD, this change leaves utilities little option other than to calculate of system specific TOV values. For voltages exceeding 72.5 kV, the distances are based on the equations used to calculate the proposed distances (D = TOV × (C + a) + M). This is the most important rule: Work at a safe distance from all power lines. OSHA Subpart V •Minimum Approach Distances and Insulation •Minimum approach distance revisions were effective April 1, 2015. Distance: Approach: NEC: National Electrical Code. The same standard states that the top of the barrier must be no less than 1,500 mm (5 feet) above the adjacent walking surface. 200 Constitution Ave NW •Protection from Flames and Electric Arc Hazards •The employer must assess the workplace to identify workers exposed to flame or 800-321-6742 (OSHA) www.OSHA.gov, Occupational Safety and Health Administration 3The clear live-line tool distance shall equal or exceed the values for the indicated voltage ranges. PPE: Personal Protective Equipment. Users must request such authorization from the sponsor of the linked Web site. ELECTRICAL MINIMUM APPROACH DISTANCE TRAINING FOR NON-ELECTRICAL PERSONNEL Course 431. Mark the location of all overhead power lines and/or exposed underground cables on plans and drawings. 4 Until March 31, 2015, employers may use the minimum approach distances in Table 6 through Table 13 in Appendix B to this section. OSHA establishes Minimum Approach Distances (MAD) for both qualified and non qualified workers. 800-321-6742 (OSHA) NFPA: National Fire Protection Association. OSHA requires that you work at least 10 feet away from power lines 50,000 volts or less.
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