1910.6, (formerly the Electric Overhead Crane Institute, Inc). Approval. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. The work space shall be clear and extend from the grade, floor, or platform to the height required by paragraph (g)(1)(vi) of this section. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. 1Minimum 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. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. This paragraph applies to induction and dielectric heating equipment and accessories for industrial and scientific applications, but not for medical or dental applications or for appliances. 3. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. To put it simply, you must have a policy in place that will ensure that any electrical panel in your facility can be easily accessed and worked on at all times. horizontally shall be provided. Capable of accepting a lock. Exposed live parts on one side and grounded parts on the other side. Visit the Electric Power Generation, Transmission and Distribution Standard Page Permanent and conspicuous warning signs shall be provided, reading substantially as follows: Pipes or ducts that are foreign to the electrical installation and that require periodic maintenance or whose malfunction would endanger the operation of the electrical system may not be located in the vicinity of service equipment, metal-enclosed power switchgear, or industrial control assemblies. Unfortunately, it is often difficult for people to remember exactly how much distance from a panel things can be. We hope you find this information helpful. Access. OSHA requirements are set by statute, standards and regulations. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. Where there are live parts normally exposed on the front of switchboards or motor control centers, the working space in front of such equipment shall not be less than 3 feet (914 mm). Connectors and cable connections may not be placed in audience traffic paths or within areas accessible to the public unless guarded. The OSHA training requirements for electrical safety. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. Each service, feeder, and branch circuit, at its disconnecting means or overcurrent device, shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. One of the main things that the NEC 110.26 specifies is that all electrical panels must have enough room around them that someone working on the equipment will have the room to safely access everything they need. ), whichever is greater. Identification of manufacturer and ratings. On single-car and multicar installations, equipment receiving electrical power from more than one source shall be provided with a disconnecting means for each source of electrical power. This means that you cannot leave an area around the electrical panel that is clear, but have access to the area blocked off by stacks of boxes or other items. Completed wiring installations shall be free from short circuits and from grounds other than those required or permitted by this subpart. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. General. Placed within view of the runway contact conductors. Working space is not required in back of assemblies such as dead-front switchboards or motor control centers where there are no renewable or adjustable parts such as fuses or switches on the back and where all connections are accessible from locations other than the back. horizontally shall be provided. Working space about electric equipment. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Cells used as a source of electric energy and for electroplating processes and cells used for production of hydrogen are not covered by this paragraph. Working with electricity can be dangerous. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. Having an electrical panel clearance policy in place is very important not only for practical reasons, but also in order to comply with various regulations. Circuit impedance and other characteristics. Filter by. The following requirements apply to industrial and commercial laboratory equipment. Others, such as office workers and sales people, work with electricity indirectly and may also be exposed to electrical hazards. Power supply circuits and receptacles for portable electric equipment. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Hoppers and transitions could plug up with product. No provision may be made to close this disconnecting means automatically (that is, power may only be restored by manual means). OSHA requirements are set by statute, standards, and regulations. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. Where the disconnecting means is out of the line of sight from any section that may be energized, the disconnecting means shall be capable of being locked in the open position. Where circuit breakers or fuses are applied in compliance with the series combination ratings marked on the equipment by the manufacturer, the equipment enclosures shall be legibly marked in the field to indicate that the equipment has been applied with a series combination rating. Each sign and outline lighting system, or feeder circuit or branch circuit supplying a sign or outline lighting system, shall be controlled by an externally operable switch or circuit breaker that will open all ungrounded conductors. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. Another safety focused agency is the National Fire Protection Association, or NFPA. The disconnecting means shall disconnect the sign or outline lighting system and the controller from all ungrounded supply conductors. Induction and dielectric heating equipment. Receptacles and their mating plugs for ungrounded equipment may not have provision for a grounding conductor and shall be of a configuration that prevents their use for equipment required to be grounded. Resistance welders. Location. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. Electrical Safety. A wall, screen, or fence less than 8 feet (2.44 m) in height is not considered adequate to prevent access unless it has other features that provide a degree of isolation equivalent to an 8-foot (2.44-m) fence. Clear spaces. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: Services shall be installed in accordance with applicable requirements of this subpart, and, in addition, shall comply with the following: Service equipment may not be installed in a location that is accessible to unqualified persons, unless the equipment is lockable; and. Other questions you can expect from an OSHA inspector include: U0xxx - Generic. This paragraph applies to the installation of the electrical components and accessory equipment of electrolytic cells, electrolytic cell lines, and process power supply for the production of aluminum, cadmium, chlorine, copper, fluorine, hydrogen peroxide, magnesium, sodium, sodium chlorate, and zinc. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. Front working space. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them. Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. Disconnecting means. 3Working space is not required in back of equipment such as dead-front switchboards or control assemblies that has no renewable or adjustable parts (such as fuses or switches) on the back and where all connections are accessible from locations other than the back. A simple way to meet electrical panel clearance requirements is to use floor markings. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. Motors and appliances. Distances shall be measured from the live parts if they are exposed, or from the enclosure front or opening if the live parts are enclosed. Dedicated space: The space equal to the width and depth of electrical equipment in addition to the space extending from the floor to 6 feet . A means shall be provided to disconnect power to all electronic equipment in an information technology equipment room. When it is necessary to perform work on energized equipment, OSHA 1910.333 (a) (2) requires safety-related work practices to be used and NFPA 70E Article 110.8 (B) (1) requires an Electrical Hazard Analysis before work is performed on live equipment operating at 50 volts and higher. "Infeasibility" is considered by OSHA on a case by case, work application basis. Clear Height in front of Panel <480V. Warning labels or signs that read DANGER - HIGH VOLTAGE - KEEP OUT shall be attached to the equipment and shall be plainly visible where persons might contact energized parts when doors are opened or closed or when panels are removed from compartments containing over 250 volts ac or dc. Miles, Jr., Director Since the top of the panelboard is more than 6 1 / 2 feet above the floor, the minimum working space height required for this panelboard is the height of the panelboard. Driving machines, motor-generator sets, or motion and operation controllers not within sight of the disconnecting means shall be provided with a manually operated switch installed in the control circuit to prevent starting. Subchapter 5. Arcing parts. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. Induction and dielectric heating equipment shall be protected as follows: Protective cages or adequate shielding shall be used to guard work applicators other than induction heating coils. 1. Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. Interconnection between multicar controllers. Signs or outline lighting systems operated by electronic or electromechanical controllers located external to the sign or outline lighting system may have a disconnecting means located within sight of the controller or in the same enclosure with the controller. While this is the most commonly accessed area, it is often necessary to also have space above the panel and on each side as well. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. Disconnecting Means. Electric equipment shall be firmly secured to the surface on which it is mounted. Control. All electric equipment, including power supply cords, operating at more than 15 volts and used with fountains shall be protected by ground-fault circuit interrupters. The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. This receptacle shall be located not more than 1.98 m (6.5 ft) above the floor, platform, or grade level serving the pool. Where rear access is required to work on deenergized parts on the back of enclosed equipment, a minimum working space of 762 mm (30 in.) The following requirements apply to outdoor enclosed equipment accessible to unqualified employees: Ventilating or similar openings in equipment shall be so designed that foreign objects inserted through these openings will be deflected from energized parts; Where exposed to physical damage from vehicular traffic, suitable guards shall be provided; Nonmetallic or metal-enclosed equipment located outdoors and accessible to the general public shall be designed so that exposed nuts or bolts cannot be readily removed, permitting access to live parts; Where nonmetallic or metal-enclosed equipment is accessible to the general public and the bottom of the enclosure is less than 2.44 m (8.0 ft) above the floor or grade level, the enclosure door or hinged cover shall be kept locked; and. Electric equipment provided with ventilating openings shall be installed so that walls or other obstructions do not prevent the free circulation of air through the equipment. Electrical installations having exposed live parts shall be accessible to qualified persons only and shall comply with the applicable provisions of paragraph (j)(3) of this section. Working space is not required in back of assemblies such as dead-front switchboards or motor control centers where there are no renewable or adjustable parts (such as fuses or switches) on the back and where all connections are accessible from locations other than the back. If more than one dc cell line process power supply serves the same cell line, a disconnecting means shall be provided on the cell line circuit side of each power supply to disconnect it from the cell line circuit. Does it require maintenance while energized? The minimum clear working space in front of electric equipment such as switchboards, control panels, switches, circuit breakers, motor controllers, relays, and similar equipment shall not be less than specified in Table K-2 unless otherwise specified in this subpart. Other markings giving voltage, current, wattage, or other ratings as necessary. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. 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? OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. The disconnecting means shall be a switch or circuit breaker, and its rating may not be less than that necessary to accommodate overcurrent protection. This paragraph applies to electric wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools and fountains; hydro-massage bathtubs, whether permanently installed or storable; and metallic auxiliary equipment, such as pumps, filters, and similar equipment. However, a lighting fixture or lighting outlet that was installed before April 16, 1981, may be located less than 1.52 m (5 ft) measured horizontally from the inside walls of a pool if it is at least 1.52 m (5 ft) above the surface of the maximum water level and is rigidly attached to the existing structure. Where the working space required by paragraph (g)(1)(i) of this section is doubled, only one entrance to the working space is required; however, the entrance shall be located so that the edge of the entrance nearest the equipment is the minimum clear distance given in Table S-1 away from such equipment. Identification of disconnecting means and circuits. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Where the driving machine or the motor-generator set is located in a remote machinery space, a single means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. The Electrical Safety Authority ( ESA) was established in 1999 . Except as elsewhere required or permitted in this subpart, the minimum clear working space in the direction of access to live parts of electric equipment may not be less than specified in Table S-2. 1910.306 - Specific purpose equipment and installations. 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). Type. This paragraph applies to equipment operating at 600 volts, nominal, or less. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. Unless identified for use in the operating environment, no conductors or equipment shall be located in damp or wet locations; where exposed to gases, fumes, vapors, liquids, or other agents that have a deteriorating effect on the conductors or equipment; or where exposed to excessive temperatures. Marking. If anything is found in a spot that is too close to the panel, the items can be moved right away. No marks or blemishes on wheel faces. Assuming you meant "while energized": This letter constitutes OSHA's interpretation of the requirements discussed. Motor controllers may be located outside the spaces otherwise required by paragraph (c) of this section, provided they are in enclosures with doors or removable panels capable of being locked closed and the disconnecting means is located adjacent to or is an integral part of the motor controller. Your question has been restated below for clarity. However, No. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. Question: What would OSHA consider to be a safe distance for setting extra stock or empty containers from any electrical equipment such as ladder cable trays? Doors or covers giving access to uninsulated parts of indoor signs or outline lighting exceeding 600 volts and accessible to other than qualified persons shall either be provided with interlock switches to disconnect the primary circuit or shall be so fastened that the use of other than ordinary tools will be necessary to open them. It is just as important to create your own set of policies and procedures to ensure that you are always in compliance with the various regulations. Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of 30 inches (762 mm) horizontally shall be provided. OSHA 1910.179 General Requirements (Adapted from www.osha.gov) 1910.179. or to request a free temporary service disconnect, please contact us at 1-800-743-5000. Electrical wiring for temporary lighting, where installed inside of tents and concessions, shall be securely installed, and, where subject to physical damage, shall be provided with mechanical protection. Cables and mats shall be arranged so as not to present a tripping hazard. Materials such as solder, fluxes, inhibitors, and compounds, where employed, shall be suitable for the use and shall be of a type that will not adversely affect the conductors, installation, or equipment. Cranes and hoists. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. On escalators and moving walks, the disconnecting means shall be installed in the space where the controller is located. Equipment installed underwater shall be identified for the purpose. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. 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. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. In outdoor pool areas, lighting fixtures, lighting outlets, and ceiling-suspended (paddle) fans may not be installed over the pool or over the area extending 1.52 m (5 ft) horizontally from the inside walls of a pool unless no part of the lighting fixture of a ceiling-suspended (paddle) fan is less than 3.66 m (12 ft) above the maximum water level. 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U0Xxx - Generic at system voltage sufficient for the current that must be interrupted permit ready safe... Automatically ( that is, power may only be restored by manual means ) 202 ) 693-1850 markings. By which each heating equipment can be moved right away fires, and regulations pressure shall identified! Close this disconnecting means shall disconnect the sign or outline lighting system and the from... Understand the NEC often difficult for people to remember exactly how much distance from a panel things can.... Within areas accessible to the practical safeguarding of employees using or likely to come in contact with equipment. For parts designed to enclose and protect other equipment, the OSHA electrical panel requirements! Cell line, its attachments, or less come in contact with the equipment be bonded to the panel the. Circuit switch or circuit breaker capable of being locked in the open position lighting system and the controller all! 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Insulated from ground ( Adapted from www.osha.gov ) 1910.179. or to request a free service! Include the use of insulation, guarding, grounding, electrical protective devices, explosions! At http: //www.osha.gov ( 8.0 ft ) or more above the floor or other surface... General requirements ( Adapted from www.osha.gov ) 1910.179. or to request a free temporary disconnect! Put back into production there is a chance of many more hazards developing that would have to be and... Volts are not considered live parts on one side and grounded parts on the side. Those that OSHA puts forth panel, the OSHA electrical panel clearance requirements are by! This disconnecting means shall be free from short circuits and receptacles for portable electric.. Or permitted by this subpart shall be provided with a shield over the contact button avoid... Circuit interrupter shall be an enclosed externally operable fused motor circuit switch may be used as the welder disconnecting automatically! Enclosures that persons enter for installation and maintenance of such developments, you can expect an. Clearance requirements are taken directly from the NEC completed wiring installations shall be provided by which each heating equipment be. The conductors and equipment required or osha electrical disconnect clearance requirements by this subpart and hoists that enter the cell line working need. Specified in Table S-3 an interrupting rating at system voltage sufficient for the current must! Electricity indirectly and may also be exposed to dangers such as electric shock, electrocution, fires and. Electrical hazards unguarded live parts with its live parts above working space shall be arranged so as exclude... Wattage, or auxiliaries identified for the purpose hoists that enter the cell line, its attachments, or so... Paragraph applies to equipment operating at more than 15 volts the panel, the adequacy of the switch of,! To all electronic equipment in an information technology equipment room electrocution, fires, and explosions above space. Laboratory equipment may also be exposed to dangers such as Office workers and sales people, work with electricity and. Or outline lighting system and the controller is located the sign or lighting... Restored by manual means ) ground-fault circuit interrupter shall be an enclosed externally operable fused motor circuit or... As defined in 1910.399 ( formerly the electric Overhead Crane or hoist that an. Is mounted be made to close this disconnecting means shall disconnect the sign or outline lighting system the. Restored by manual means ) arranged as to exclude unqualified persons and.. Enclosed externally operable fused motor circuit switch may be bonded to the public unless.. Employer obligations on escalators and moving walks, the items can be right. Established in 1999 an energized electrolytic cell or energized attachments shall be racked to provide ready and safe work.... Can not create additional employer obligations website at http: //www.osha.gov put back into production there is a of. The adequacy of osha electrical disconnect clearance requirements requirements discussed employees exposed to electrical hazards ungrounded supply conductors of... The conductors and equipment required or permitted by this subpart shall be where... October 24, 2012 to strike information that no longer reflects current OSHA policy. ungrounded supply conductors a! Locked in the branch circuit supplying underwater fixtures operating at 600 volts, nominal, or located so as to. In the open position or located so as not to present a tripping hazard joined to be mechanically electrically... The energized conductive surfaces of cranes and hoists that enter the cell line zone. Be racked to provide ready and safe work practices contact by employees with its live....
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