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 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. Open disconnecting devices before tagging. Following the 110.26 NEC standards is fairly easy. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). OSHA Requirements for Electrical Panel Floor Markings Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Panels with 151 to 600 volts should have 42 of clearance around it. However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 153 mm (6 in.) This letter constitutes OSHA's interpretation of the requirements discussed. Where installed outdoors, the box shall be of weatherproof construction and mounted so that the bottom of the enclosure is not less than 152 mm (6 in.) Miles, Jr., Director Your letter has been referred to the Directorate of Enforcement Program's (DEP's) Office of General Industry Enforcement for an answer to your question regarding clearances from electrical equipment. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. Type. horizontally shall be provided. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? The disconnecting means shall be capable of being locked in the open position. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. Electrical panels need to be installed 4 off the ground with the center grip handle of the highest circuit breaker is no more than 6'7 high to be NEC compliant. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. 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. 2 or larger. Grounding should be the last of these steps. Installations accessible to unqualified persons. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. By location in a room, vault, or similar enclosure that is accessible only to qualified persons; By suitable permanent, substantial partitions or screens so arranged so that only qualified persons will have access to the space within reach of the live parts. 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. Your question has been restated below for clarity. Workspace about equipment. Splices. The tape can be placed down in the proper spots to make sure you get immediate results. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. It states: For one- and two-family dwelling units, all service conductors shall terminate in disconnecting means having a short-circuit current rating equal to or greater than the available fault current, installed in a readily accessible outdoor location. Wire or cable in suitable metal raceways or metal cable trays installed with insulating breaks such that they will not cause a potentially hazardous electrical condition. Cranes and hoists. This is not only important for avoiding getting fined for violating the requirements, but also for ensuring your facility is as safe as possible. 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. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. The fact is, however, that it goes well beyond that. On elevators without generator field control, the disconnecting means shall be located within sight of the motor controller. Interrupting rating. 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. On switchboard and control panels exceeding 1.83 m (6.0 ft) in width, there shall be one entrance at each end of such boards unless the location of the switchboards and control panels permits a continuous and unobstructed way of exit travel, or unless the work space required in paragraph (h)(5)(i) of this section is doubled. Arcing parts. 1910.306 - Specific purpose equipment and installations. 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. 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. 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. Condition B - Exposed live parts on one side and grounded parts on the other side. A single receptacle of the locking and grounding type that provides power for a permanently installed swimming pool recirculating pump motor may be located not less than 1.52 m (5 ft) from the inside walls of a pool. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Three rules from the general industry electrical standard are among Oregon OSHA's top 25 violations every year: 1910.303 (b): Examination, installation, and use of equipment. Durability of markings. This fault shall be assumed to be either between two or more of the circuit conductors, or between any circuit conductor and the grounding conductor or enclosing metal raceway. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. We appreciate your interest in occupational safety and health. 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. Driving machines 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 adjacent to the equipment in order to prevent starting. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. Disconnecting means required by this subpart shall be capable of being locked in the open position. Enclosure, Occupational Safety & Health Administration, Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. The disconnecting means shall be located where it is readily accessible to qualified persons. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Defiance, Ohio 43512 Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by cabinets or other forms of enclosures, or by any of the following means: By location in a room, vault, or similar enclosure that is accessible only to qualified persons. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be guarded. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. However, No. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be as follows: For installations built before August 13, 2007, 1.91 m (6.25 ft); and. 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. 1910.305 (g): Wiring requirements for flexible cords and cables. Lock out/tag out after disconnecting, before voltage testing. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. 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. Also, from time to time we update our guidance in response to new information. Note to paragraph (h)(5)(vi) of this section: Piping and other facilities are not considered foreign if provided for fire protection of the electrical installation. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. The points of control shall be located so that persons are prevented from contacting any live part or moving part of the equipment while turning on the lights. Interrupting rating. At least one entrance not less than 24 inches (610 mm) wide and 6 feet 6 inches (1.98 m) high shall be provided to give access to the working space about electric equipment. Grouping. Electrolytic cells. Our interpretations letters explain the requirements, and how they apply to particular circumstances, but they can not create additional employer obligations. 5 Steps Before Working Lines or Equipment as De-Energized. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. Location. Where the driving machine is located in a remote machinery space, a single disconnecting means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. Electrical equipment shall not be used unless the manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product may be identified is placed on the equipment and unless other markings are provided giving voltage, current, wattage, or other ratings as necessary. 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? How to determine requirementspart 2: To be on the safe side, the working space and space around electrical equipment should always be clear per 110.26 (A), if possible. It is not an official legal edition of the CFR. Here's a broad breakdown of space requirements when planning around electrical panels: The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. The Occupational Safety and Health Administration is a part of the U.S. Department of Labor that makes workplace clearance requirements to help ensure the safety and health of employees. They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. No fixed work platform has been provided for servicing the unit. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. They bring all the electrical lines into one centralized location so that the main power source can feed them. Where there is more than one driving machine in a machine room, the disconnecting means shall be numbered to correspond to the identifying number of the driving machine that they control. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. For equipment connected to a 120-volt branch circuit of 30 amperes or less, a grounding-type attachment plug cap and receptacle of proper rating may serve as a disconnecting means. Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, may not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues. Cables and mats shall be arranged so as not to present a tripping hazard. Cord connectors may not be laid on the ground unless listed for wet locations. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: This is for ANY electrical panel including the corner of the condenser where the wiring enters. Signs and outline lighting systems located within fountains shall have the disconnect located at least 1.52 m (5.0 ft) from the inside walls of the fountain. Connection of conductors to terminal parts shall ensure a good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads. Line connectors are of the listed sequential-interlocking type so that load connectors are connected in the following sequence: Equipment grounding conductor connection; Grounded circuit-conductor connection, if provided; and, Ungrounded conductor connection; and so that disconnection is in the reverse order; or. . It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. There shall be no damaged parts that may adversely affect safe operation or mechanical strength of the equipment, such as parts that are broken, bent, cut, or deteriorated by corrosion, chemical action, or overheating. A fence may not be less than 2.13 m (7.0 ft) in height or a combination of 1.80 m (6.0 ft) or more of fence fabric and a 305-mm (1-ft) or more extension utilizing three or more strands of barbed wire or equivalent. 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. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. 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. In addition, from time to time we update our guidance in response to new information. Marking. 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. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. for information on the final rule. 508 Carpenter Road Since electrical fires are one of the biggest risks that a facility can face, it should come as no surprise to find that the NFPA has requirements in this area. A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism. 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. For example, a switchboard is located next to a disconnect (safety) switch. 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. Electrical Safety Orders. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. Motors and appliances. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6 feet of headroom space. At least one entrance not less than 610 mm (24 in.) Outdoor electric equipment shall be installed in suitable enclosures and shall be protected from accidental contact by unauthorized personnel, or by vehicular traffic, or by accidental spillage or leakage from piping systems. 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). 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. Clearance. High-Voltage Electrical Safety Orders (Sections 2700 - 2989) 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. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. The disconnecting means shall be within sight of the equipment served. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 4. The disconnecting means shall be a switch or circuit breaker, and its rating may not be less than that necessary to accommodate overcurrent protection. 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. For equipment rated 1200 amperes or more and over 1.83 m (6.0 ft) wide, containing overcurrent devices, switching devices, or control devices, there shall be one entrance not less than 610 mm (24 in.) Space about electric equipment. A disconnecting means shall be provided for each motor and controller. This paragraph applies to equipment operating at 600 volts, nominal, or less. Headroom. July 26, 2004 A simple way to meet electrical panel clearance requirements is to use floor markings. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. (10 cm) for every 10 kV over that voltage. Dear Mr. Overby: If remote controls are used for applying power, a selector switch shall be provided and interlocked to provide power from only one control point at a time. Interlock switches shall be connected in such a manner as to remove all power from the applicator when any one of the access doors or panels is open. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. You're not if you fail to comply with the following three clearance requirements in Sec. Suitability of equipment for an identified purpose may be evidenced by listing, labeling, or certification for that identified purpose. When looking into electrical panel clearance safety, you need to start by looking at the requirements put in place by the national electric code, or NEC. 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. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. 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. Receptacles on circuits supplied by an isolating transformer with an ungrounded secondary: May not be used in any other location in the facility. The disconnecting means shall be a listed device. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. General. Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone. All of these options will use effective visual communication standards to make sure that nothing is placed in the area directly around your electrical panels. 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. By elevation of 8 feet (2.44 m) or more above the floor or other working surface and so installed as to exclude unqualified persons. Nominal voltage to ground 151-600V: minimum side clearance distance = 4 ft. (1.2 m) Nominal voltage to ground 601-1000 V: minimum side clearance distance = 5 ft. (1.5 m) Electrical Equipment Working Space Intrusions and Exceptions Equipment such as an electrical meter are allowed to protrude into the working space up to a maximum of 6 in. Well, the switch will require maintenance as in cleaning, lubrication, inspection. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. Resistance welders. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. 2. Wiring for an amusement ride, attraction, tent, or similar structure may not be supported by another ride or structure unless specifically identified for the purpose. Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that must be interrupted. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. Note that our enforcement guidance may be affected by changes to OSHA rules. Service equipment shall be mounted on solid backing and installed so as to be protected from the weather, unless the equipment is of weatherproof construction. 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. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. 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. Employer obligations ( 2 ) NOTE: for SI units: one foot=0.3048 m. Elevation of unguarded live above! Room, but also their tools the employer shall ensure that electrical equipment, not just panels... Be arranged so as not to present a tripping hazard enclosures that persons enter installation... Use of insulation, guarding, grounding, electrical protective devices, and other professionals work electricity!, however, that it goes well beyond that employees Exposed to dangers such as electric shock,,. Than specified in Table S-3 be laid on the other side with these tools, marking... Secure without solder and then soldered volts, nominal, or molded case.! 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