osha electrical disconnect clearance requirements
The Electrical Safety program is designed to prevent electrically related injuries and property damage. "Infeasibility" is considered by OSHA on a case by case, work application basis. In deciding working space or free and clear distances around electrical contro… This letter constitutes OSHA's interpretation of the requirements discussed. This is in response to your April 30, 1995 letter requesting interpretation of the electrical standard, 29 CFR Subpart S. Your letter, which was addressed to Mr. Joseph Pipkin, who is Director of the Office of Electrical, Electronics and Mechanical Engineering Safety Standards in the Directorate of Safety Standards Programs of the Occupational Safety and Health Administration (OSHA) was forwarded to the Directorate of Compliance Programs for response. Reply: Deenergizing the 110 volt control circuit in the above scenario appears to be infeasible as discussed in Note 2 following paragraph 1910.333(a)(1). Clearance Tables. In order for the 480 volt circuit(s) to be considered deenergized, the lockout and tagging requirements of paragraph 1910.333(b)(2) must be met.
Hot glue machines would be shutdown and the glue would set.
Washington, DC 20210 OSHA Safety Regulations for Maintenance Workers, OSHA: Interpretation of “Readily Accessible”. Mr. John C. (Jack) Schuldt, Sr. To ensure that an electrical panel can be accessed at all times – during inspection, maintenance or emergency – OSHA has determined that the working space in front of the equipment must be at least 30-inches wide (or the width of the equipment). To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. This means a cover must be in place so the person on the “operating side of the equipment” cannot be exposed to any live components. 1. www.OSHA.gov. Defiance, Ohio 43512 Please click the button below to continue.
The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. This space cannot be used for permanent fixtures or temporary storage. Sincerely, 7.
Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. Because they include so many live wires and other charged parts, electrical panels must have a “dead front,” according to OSHA standards. Note that our enforcement guidance may be affected by changes to OSHA rules. Application for variances are covered under 29 CFR Part 1905. 5. Climbing over or moving furniture and other impediments to reach the equipment also constitutes a violation of the “readily accessible” standard. Hundreds of motors would be shutoff.
Reply: An employer who has in his or her workplace contractors or equipment, including a motor control center which are in violation of any of the requirements under paragraphs 1910.303 through 1910.308 are subject to citation based solely on applicable electrical installation requirements. Miles, Jr., Director Control power is off on a large number of machines. Eight (8) to ten (10) hours of start-up time could be required to re-load processing bins, fluidizing lines and processing transitions. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. 200 Constitution Ave NW Programmable Logic Controllers shut off in some instances and there is no power back-up. 3. We appreciate your interest in occupational safety and health. Rather than move the motor control center at a cost of two million dollars, can a "safe job procedure" which is audited periodically be considered an acceptable alternative or is a variance required? 2. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. 800-321-6742 (OSHA)
Application for variances under Paragraph 1910.11 must include a statement showing how the conditions, practices, means, methods, operations, or processes used or proposed to be used would provide employment and places of employment to employees which are as safe and healthful as those required under the standard from which a variance is sought. In addition to OSHA standards, electrical panels fall under National Electrical Code (NEC) regulations. There would be no additional need to deenergize circuits for other equipment to deenergize a motor and its controller disconnected by an individual disconnecting means which meets paragraph 1910.305(j)(4) requirements. Thank you for visiting our site. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. In commercial buildings, these dead fronts must be locked and access must only be granted to trained personnel. If we can be of further assistance, please contact the Office of General Industry [at (202) 693-1850].
The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: Question 2: A motor control center does not meet Table S-1 work clearances required under paragraph 1910.303(g)(1) when working on live parts operating at 600 volts or less. If electrical panels are locked, they are still considered readily accessible, as long as qualified persons can quickly access the keys.
All fluidizing lines-would have to be purged in order to prevent plugging of the line.
This means a 30 by 36 inch space (or larger) in front of panels, access panels on HVAC equipment and fused disconnects. The Occupational Health and Safety Administration (OSHA) and the National Fire Protection Association (NFPA) have outlined the amount of clearance necessary around an electric panel. His newscasts and reports have been broadcast on Clear Channel stations throughout the Northwest since 2006. -- Minimum Depth of Clear Working Space at, Table S-2. Safety electrical work practices; motor disconnects;work clearances. Washington, DC 20210 Application for variances are covered under 29 CFR Part 1905.
508 Carpenter Road According to the OSHA Standard 29 CFR 1910.303 (g), companies are required to provide 3 feet of clearance around electrical services and breaker panels with between 120 and 250 volts. Our in house safety person says that the expectation of clearance of a local disconnect is the same as the electrical panel that feeds it.
Question 1: Paragraph 1910.333(a)(1) requires that live parts to which an employee may be exposed must be deenergized before the employee works on or near them, unless the employee can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations. The location of the disconnect is on the wall behind the machine. John B. Users must request such authorization from the sponsor of the linked Web site. They have also determined that all live components must be enclosed to protect workers. 110.26(A)(1) Depth of Working Space. The working width around the panel must be at least 30 inches. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] Occupational Safety and Health Administration NEC 110.26 requires working clearance in front of equipment likely to require calibration, testing, or adjustment while energized. 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. 6. The depth of the working space in the direction of live parts shall not be less than that specified in table 110.26(A)(1) unless the requirements of 110.26(A)(1)(a), (A)(1)(b), or (A)(1)(c) are met. TTY Only employees qualified in this program may conduct adjustment, repair or replacement of electrical components or equipment. 200 Constitution Ave NW He graduated summa cum laude from Portland State University. 800-321-6742 (OSHA) 8.
February 7, 1996 Dear Mr. Schuldt:
Also, from time to time we update our guidance in response to new information. Electrical panels not only have to meet the explicit measurement standards of OSHA and NFPA, they must also be reasonably considered “readily accessible.” In a 2005 letter to the Marshall Space Flight Center, OSHA Director Richard Fairfax further clarified the term. President, Safety Specialties Incorporated Working Space around Indoor Panel/Circuit Board (NES 312.2) Clearance around an Indoor electrical panel (NEC 110.26) Clearance for Conductor Entering in Panel (NES 408.5) Clearance between Bare Metal Busbar in Panel (NES 408.5) Clearance of Outdoor electrical panel to Fence/Wall (NES 110.31) Table S-1. -- Minimum Depth of Clear Working Space at, Table S-3. If deenergizing the control circuit(s) is infeasible, paragraph 1910.333(c)(2) would apply to work on or near the 110 volt control circuit(s). Notes to Table S-2: 1 Minimum depth of clear working space in front of electric equipment with a nominal voltage to ground above 25,000 volts may be the same as that for 25,000 volts under Conditions A, B, and C for installations built before April 16, 1981. Hoppers and transitions could plug up with product.
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