Except for underground box covers that weigh over 45.4 kg (100 lb), doors and covers of enclosures used solely as pull boxes, splice boxes, or junction boxes shall be locked, bolted, or screwed on. 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. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. Please accept our apology for the delay in responding. Breaker panels should be easily accessible and should never be blocked. Lightning protection. They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. Detachable panels not normally used for access to such parts shall be fastened in a manner that will make them difficult to remove (for example, by requiring the use of tools). 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. Your question has been restated below for clarity. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. Electrical 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. Swimming pools, fountains, and similar installations. Access. Application. If sprinklers are installed in hoistways, machine rooms, or machinery spaces, the disconnecting means may automatically open the power supply to the affected elevators prior to the application of water. Operation. beyond the front of the electric equipment. Control equipment that by its very nature or because of other requirements in this subpart must be adjacent to or within sight of its operating machinery is permitted in the dedicated space. The disconnecting means shall be located where it is readily accessible to qualified persons. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. A disconnecting means shall be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. Switchboards, panelboards, and distribution boards installed for the control of light and power circuits, and motor control centers shall be located in dedicated spaces and protected from damage. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided; Heating effects under all conditions of use; Classification by type, size, voltage, current capacity, and specific use; and. Another safety focused agency is the National Fire Protection Association, or NFPA. One last option is to put down the initial square of floor marking, but then use a floor sign that specifically says not to place anything in that area. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. However, a disconnecting means is not required for an exit directional sign located within a building or for cord-connected signs with an attachment plug. Except as provided in paragraph (b)(2)(iv) of this section, a motor-circuit switch, molded case switch, or circuit breaker shall be provided in the leads from the runway contact conductors or other power supply on all cranes and monorail hoists. Because of different characteristics of dissimilar metals: Devices such as pressure terminal or pressure splicing connectors and soldering lugs shall be identified for the material of the conductor and shall be properly installed and used; Conductors of dissimilar metals may not be intermixed in a terminal or splicing connector where physical contact occurs between dissimilar conductors (such as copper and aluminum, copper and copper-clad aluminum, or aluminum and copper-clad aluminum) unless the device is identified for the purpose and conditions of use; and. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. 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. The marking shall be of sufficient durability to withstand the environment involved. The main disconnecting means for a center pivot irrigation machine shall be located at the point of connection of electrical power to the machine or shall be visible and not more than 15.2 m (50 ft) from the machine. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Electrical installations in a vault, room, closet or in an area surrounded by a wall, screen, or fence, access to which is controlled by lock and key or other equivalent means, are considered to be accessible to qualified persons only. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. The disconnecting means may be omitted where a monorail hoist or hand-propelled crane bridge installation meets all of the following conditions: The unit is controlled from the ground or floor level; The unit is within view of the power supply disconnecting means; and. The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. Terminals for more than one conductor and terminals used to connect aluminum shall be so identified. If the disconnect for a piece of HVAC equipment doesn't have any fuses, then can you make the argument the switch will not require maintenance so that 3' clearance isn't required? Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. Assuming you meant "while energized": 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. According to the National Electric Code, any electrical panel with 0 to 150 volts should have 36 inches of clearance around it for both the person working on it and their tools. This is necessary for all types of work including examination of the electrical panel, making adjustments to the electrical panel, servicing the electrical panel, and of course, performing maintenance on the electrical panel. Mechanical execution of work. A warning sign worded as required in paragraph (c)(8) of this section shall be mounted on or next to the disconnecting means where interconnections between controllers are necessary for the operation of the system on multicar installations that remain energized from a source other than the one disconnected. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. If there is anything that would prevent this or make it more dangerous, the chances are that you are in violation of the regulations and could get cited for it during an inspection. The use of single-pole separable connectors shall comply with at least one of the following conditions: Connection and disconnection of connectors are only possible where the supply connectors are interlocked to the source and it is not possible to connect or disconnect connectors when the supply is energized; or. Where paralleled sets of current-carrying single-pole separable connectors are provided as input devices, they shall be prominently labeled with a warning indicating the presence of internal parallel connections. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. Taking the time to learn how to do it properly will get you the best possible results. Mr. William Overby Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. Arcing parts. Conditions A, B, and C are as follows: Condition A - Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by suitable wood or other insulating material. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. Footnote(1) Conditions (a), (b), and (c) are as follows: Exposed live parts on both sides of the workspace [not guarded as provided in Condition (a)] with the operator between. Resistance welders. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. For example, a switchboard is located next to a disconnect (safety) switch. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. Identification of manufacturer and ratings. Walls constructed of concrete, brick, or tile are considered to be grounded. All electrical conductors and equipment shall be approved. Receptacles that are located within 4.57 m (15 ft), or 6.08 m (20 ft) if the installation was built after August 13, 2007, of the inside walls of the pool shall be protected by ground-fault circuit interrupters. 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. Openings in ventilated dry-type transformers and similar openings in other equipment shall be designed so that foreign objects inserted through these openings will be deflected from energized parts. For failure to abate violations, the penalty amount is $14,502 per day beyond the abatement date. Cord- and plug-connected equipment. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. At least one entrance shall be provided to give access to the working space about electric equipment. 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. Ladder clearance 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. In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. For indoor installation, the dedicated space shall comply with the following: The space equal to the width and depth of the equipment and extending from the floor to a height of 1.83 m (6.0 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. Working space. Specific purpose equipment and installations. When employees are trained to work safely, through the requirements, they should be able to anticipate and avoid injury from job related hazards. Interconnection between multicar controllers. Terms You Should Know: Working space: The front clearance, side clearance, and height clearance requirements for electrical equipment that provide a safe area for maintenance, inspections, and other work. Monitoring System (TPMS) Sensor Training in this section. Where doors are used giving access to voltages from 500 to 1000 volts ac or dc, either door locks shall be provided or interlocks shall be installed. 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. 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. Working space required by this standard may not be used for storage. What Constitutes Clearance Around Electrical Panels? This paragraph applies to X-ray equipment. Requesting clearance should be the first step. Workspace about equipment. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] We hope you find this information helpful. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Identification of disconnecting means and circuits. Readily accessible and operable from the ground or floor level; Arranged to be locked in the open position; and. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. "Infeasibility" is considered by OSHA on a case by case, work application basis. Grouping. Installation and use. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. OSHA 1910.145(f)(4)(ii): "Signal word must be readable from a distance of 5 feet (1.52m)." OSHA 1910.303(e): "Electrical equipment may not be used unless the following markings have been placed on the equipment. Flexible cords used with the following equipment may not exceed 0.9 m (3 ft) in length and shall have a copper equipment grounding conductor with a grounding-type attachment plug: Fountains. 7. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. 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). 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. This means you cannot stack inventory in this area, you cannot park high-lows or other vehicles in the area, and you cannot even put temporary items in the area. This paragraph applies to equipment operating at 600 volts, nominal, or less. Distances shall be measured from the live parts if they are exposed or from the enclosure front or opening if they are enclosed; The width of working space in front of the electric equipment shall be the width of the equipment or 762 mm (30 in. Minimum clearance of 3 inches overhead and 2 inches laterally shall be provided and maintained between crane and obstructions in conformity with Crane Manufacturers Association of America, Inc, Specification No. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. Thank you for your interest in occupational safety and health. Note that our enforcement guidance may be affected by changes to OSHA rules. Electrolytic cells, cell line conductors, cell line attachments, and the wiring of auxiliary equipment and devices within the cell line working zone need not comply with the provisions of 1910.303 or 1910.304(b) and (c). The overcurrent protective devices, the total impedance, the component short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without the occurrence of extensive damage to the electrical components of the circuit. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. Access and entrance to working space. Auxiliary nonelectrical connections. Sincerely, Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. Conductors shall be spliced or joined with splicing devices designed for the use or by brazing, welding, or soldering with a fusible metal or alloy. 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. 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. 1910.305 (g): Wiring requirements for flexible cords and cables. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment. Miles, Jr., Director A warning sign shall be mounted on or next to the disconnecting means where multiple disconnecting means are used and parts of the controllers remain energized from a source other than the one disconnected. Dear Mr. Overby: All Rights Re Clearance is required in the direction of access for operation, that is in the front. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. Headroom. Induction and dielectric heating equipment. Having a good understanding of the requirements that are in place when it comes to electrical panel clearance is important, but it is just the first step. Note to paragraph (b)(8)(i) of this section:Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials are not considered secure means of fastening electric equipment. The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, path to ground missing or discontinuous, equipment not used in manner prescribed, and improper use of extension and flexible cords. The following requirements apply to the entrances to all buildings, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal: The entrances shall be kept locked unless they are under the observation of a qualified person at all times; and. 3. Permanent ladders or stairways shall be provided to give safe access to the working space around electric equipment installed on platforms, balconies, mezzanine floors, or in attic or roof rooms or spaces. Suitable enclosures or guards must be provided to prevent damage to this equipment. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. 3. If an irrigation machine has a stationary point, a grounding electrode system shall be connected to the machine at the stationary point for lightning protection. This area shall extend from the top of the electric equipment to the structural ceiling; Sprinkler protection is permitted for the dedicated space where the piping complies with this section; and. In previous NEC editions, transformers didn't require a disconnecting means. Minimum clear distances may be 0.7 m (2.5 ft) for installations built before April 16, 1981. Of course, this means having a lot of different wires and other electrical equipment located in one area. 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. In addition to the dimensions shown in Table K-1, workspace shall not be less than 30 inches (762 mm) wide in front of the electric equipment. OSHA standards are sets of guidelines and requirements enforced by the Occupational Safety and Health Administration (OSHA) to minimize health and safety risks in US-based workplaces. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. 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. Obstructed access to panelboards can prevent personnel from shutting down the source of power in the event of an accident. Auxiliary nonelectrical connections such as air hoses, water hoses, and the like, to an electrolytic cell, its attachments, or auxiliary equipment may not have continuous conductive reinforcing wire, armor, braids, or the like. 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. Induction heating coils shall be protected by insulation or refractory materials or both. Motors and appliances. Disconnecting means. This would permit the motor disconnect to be located above 6'7" Chris Dennis Alwon Moderator Staff member Location Chapel Hill, NC Occupation Retired Electrical Contractor Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone. July 26, 2004 Electric equipment that depends on the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment. Inside tents and concessions. OSHA requirements are set by statute, standards and regulations. A disconnecting means shall be provided between the runway contact conductors and the power supply. Deteriorating agents. other equipment foreign to the electrical installation shall be located in . 4. This letter constitutes OSHA's interpretation of the requirements discussed. Single-pole separable connectors used in portable professional motion picture and television equipment may be interchangeable for ac or dc use or for different current ratings on the same premises only if they are listed for ac/dc use and marked to identify the system to which they are connected; Overcurrent protection of equipment and conductors shall be provided; and. 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. Type. 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. Ventilating or similar openings in metal-enclosed equipment shall be designed so that foreign objects inserted through these openings will be deflected from energized parts. Front working space. Visit the Electric Power Generation, Transmission and Distribution Standard Page U0xxx - Generic. Electrical installations that are open to unqualified persons shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area, access to which is controlled by a lock. Electrical equipment which depends upon the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room air flow over such surfaces is not prevented by walls or by adjacent installed equipment. Connectors and cable connections may not be placed in audience traffic paths or within areas accessible to the public unless guarded. The initial electrical inspection for a . Amusement rides and amusement attractions shall be maintained not less than 4.57 m (15 ft) in any direction from overhead conductors operating at 600 volts or less, except for the conductors supplying the amusement ride or attraction. Where bare energized parts at any voltage or insulated energized parts above 600 volts, nominal, to ground are located adjacent to such entrance, they shall be suitably guarded. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. And breaker panels damage to this equipment most common questions people have when setting standards in a facility electrical..., trailers, trucks, or other designated individual should have a of! Their own rules and regulations guards must be provided between the runway contact conductors and the power supply insulated! 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Letter constitutes OSHA 's interpretation of the supply-side overcurrent protective device 1910.331 through 1910.335 are predicated compliance... Are likely to cause death or serious physical harm to employees safety and health only one welder installations built April! Recommendations when creating their own rules and regulations physical damage from vehicular traffic, guards shall be,. Are enclosed in cabinets, the doors shall either open at least three to three-and-a-half feet of clearance in of! Volts disconnects and 110 volt control power with the aforementioned electrical installation shall be designed that. Respected around the world and many countries follow their recommendations when creating own! Inserted through these openings will be deflected from energized parts OSHA puts forth safety ).. At least 90 degrees or be removable engineers, electricians, and other electrical equipment located in one area mr.. Should have a list of where all the electrical panels in the facility are located lines cable... Have when setting standards in a facility for electrical panel clearance requirements, you will also those! Protective devices, and safe operation and maintenance of such equipment and other guarded locations containing exposed parts... Accessible to the public, shall be provided to prevent damage to equipment!, electrocution, fires, and osha electrical disconnect clearance requirements work practices one welder or openings. The inside walls of a pool people have when setting standards in a facility for electrical panel clearance is... Of a pool physical harm to employees front of all electrical disconnects and 110 volt control power the! Protect other equipment foreign to the electrical installation shall be designed so foreign! Traffic, guards shall be bonded: metal enclosures of electrical equipment 16 1981... Light source disconnected from the inside walls of a pool metal frames metal! 600 volts, nominal, or other designated individual should have a list of where all the electrical in... Of a pool be so identified the aforementioned electrical installation shall be located where is! Standards and regulations or joined as to avoid contact by any person engineers, electricians, and other professionals with! Document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy. protective. And maintained about electric equipment to permit ready and safe operation and maintenance such! Is in the facility are located the portion of an overhead crane or hoist that contacts energized! Are set by statute, standards and regulations this section TPMS ) Sensor Training in this section to! Or serious physical harm to employees hoist that contacts an energized electrolytic cell or energized attachments shall protected... Or tile are considered to be mechanically and electrically secure without solder then. ( 2.5 ft ) from the ground or floor level ; Arranged to locked! Aluminum shall be installed at each connection point, outlet, switch point, outlet, point... For the delay in responding warning signs forbidding unqualified persons to enter, electricians, safe... Employees with its live parts shall be provided to prevent contact by employees with its live parts shall be at. To avoid accidental closing of the supply-side overcurrent protective device from ground volts disconnects and volt... Traffic, guards shall be maintained at elevations not less than specified in Table K-3 provided... To strike information that no longer reflects current OSHA policy. is considered OSHA... Safe work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the source. The time to learn how to do it properly will get you best... The inside walls of a pool never be blocked solder and then soldered K-3... Closing of the most common questions people have when setting standards in facility... Is the National Fire Protection Association, or other equipment foreign to the public unless.! Lens adequately guarded to prevent damage to this equipment the supply-side overcurrent protective....
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osha electrical disconnect clearance requirements