To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Exposed live parts on one side and grounded parts on the other side. Cranes and hoists. other equipment foreign to the electrical installation shall be located in . Concrete, brick, and tile walls are considered as grounded surfaces. The entrances to all buildings, rooms or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal, shall be kept locked or shall be under the observation of a qualified person at all times. Examination, installation, and use of equipment -. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts shall have a single means for disconnecting all ungrounded main power supply conductors for each unit. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. The following requirements apply to industrial and commercial laboratory equipment. Unused openings in boxes, raceways, auxiliary gutters, cabinets, equipment cases, or housings shall be effectively closed to afford protection substantially equivalent to the wall of the equipment. Cord- and plug-connected equipment. Cooling. Readily accessible and operable from the ground or floor level; Arranged to be locked in the open position; and. 5. 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. Pan 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. One of the easiest and most effective ways to make sure that nobody places anything in the area around your electrical panels is to mark the area with floor marking tape. On elevators with generator field control, the disconnecting means shall be located within sight of the motor controller for the driving motor of the motor-generator set. Following the 110.26 NEC standards is fairly easy. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. 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. Protection of electric equipment. The points of control shall be so located that persons are not likely to come in contact with any live part or moving part of the equipment while turning on the lights. Panels with 151 to 600 volts should have 42 of clearance around it. Lightning protection. 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. Flexible cords and cables shall be listed for extra-hard usage. Access. 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. OSHA requirements are set by statute, standards and regulations. Auxiliary nonelectrical connections. 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. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). 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. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? 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. 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. The converting apparatus (including the dc line) and high-frequency electric circuits (excluding the output circuits and remote-control circuits) shall be completely contained within enclosures of noncombustible material. No underwater lighting fixtures may be installed for operation at over 150 volts between conductors. Electric equipment shall be firmly secured to the surface on which it is mounted. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. Note to paragraph (j)(1) of this section: In determining these dimensions, the distance to be measured is the shortest path the supply cord of an appliance connected to the receptacle would follow without piercing a floor, wall, or ceiling of a building or other effective permanent barrier. The width of Panel or 0.762 Meter which is Greater. The frames and enclosures of portable electric equipment used within the cell line working zone may not be grounded, unless the cell line circuit voltage does not exceed 200 volts DC or the frames are guarded. Disconnecting means for runway conductors. For installations other than equipment described in paragraph (h)(2)(v) of this section, a wall, screen, or fence shall be used to enclose an outdoor electrical installation to deter access by persons who are not qualified. Control power is off on a large number of machines. The disconnecting means shall be readily accessible and capable of being locked in the open position. 1. Electricity has long been recognized as a serious workplace hazard. 110-26 of the National Electrical Code (NEC): 1) at least a 3-ft clearance in front of all electrical equipment; 2) a 30 in.-wide working space in front of equipment operating at 600V or less; and 3) minimum headroom clearance of 6 ft or the height of the . The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. Installations accessible to qualified persons only. 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. Boxes shall be designed so that no live parts are exposed to accidental contact. 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. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. Unless isolated from equipment by height or physical enclosures or covers that will afford adequate mechanical protection from vehicular traffic or accidental contact by unauthorized personnel or that complies with paragraph (g)(1)(vii)(A)(2) of this section, piping, ducts, or equipment foreign to the electrical installation may not be located in this area; The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to avoid damage from condensation, leaks, or breaks in such foreign systems. See if you can "orient" the disconnect so as to have requisite clearance in front. Identification of disconnecting means and circuits. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. Most people think only about the area directly in front of the electrical panel. 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. 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. If anything is found in a spot that is too close to the panel, the items can be moved right away. 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. Eight (8) to ten (10) hours of start-up time could be required to re-load processing bins, fluidizing lines and processing transitions. Condition B - Exposed live parts on one side and grounded parts on the other side. Mr. John C. (Jack) Schuldt, Sr. Safety of equipment shall be determined using the following considerations: Suitability for installation and use in conformity with the provisions of this subpart; Note to paragraph (b)(1)(i) of this section:Suitability of equipment for an identified purpose may be evidenced by listing or labeling for that identified purpose. A new section, 450.14, requires a disconnecting means for most transformers. Resistance welders. Another nice thing about having these standardized requirements is that they apply across national boarders. Clear Height in front of Panel >480V. Amusement rides or attractions may not be located under or within 4.57 m (15 ft) horizontally of conductors operating in excess of 600 volts. Employers may only use portable distribution and termination boxes that meet the following requirements: Occupational Safety & Health Administration. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. 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. We hope you find this information helpful. Outdoor electrical installations having exposed live parts shall be accessible to qualified persons only. Motor controllers. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. Classification by type, size, voltage, current capacity, specific use. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. Illumination shall be provided for all working spaces about electric equipment. Unfortunately, it is often difficult for people to remember exactly how much distance from a panel things can be. In existing buildings where electrical equipment is being replaced, minimum 3' working clearance shall be permitted for nominal voltage to ground less than 151V or 3'-6" for nominal voltage to ground greater than 150V between dead-front switchboards, switchgear, It is also easy to verify. OSHA requirements are set by statute, standards and regulations. 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. 1910.306 - Specific purpose equipment and installations. A disconnecting means shall be provided in the supply circuit. 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. Electric equipment shall be firmly secured to the surface on which it is mounted. 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. Motor controller enclosures for escalators or moving walks may be located in the balustrade on the side located away from the moving steps or moving treadway. Clearance. Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. Swimming pools, fountains, and similar installations. 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. 4. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. Here's a broad breakdown of space requirements when planning around electrical panels: 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. 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. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. Also, from time to time we update our guidance in response to new information. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. Operation. Occupational Safety & Health Administration. Not posting required clearances in electrical panel areas, generally falls under this type of violation. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. Sincerely, 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. Control panels. Others, such as office workers and sales people, work with electricity indirectly and may also be exposed to electrical hazards. Space about electric equipment. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. Installation and use. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. Electric equipment shall be installed in a neat and workmanlike manner. 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. Safety of equipment shall be determined on the basis of the following considerations: Suitability for installation and use in conformity with the provisions of this subpart. Except as elsewhere required or permitted by this standard, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by use of approved cabinets or other forms of approved enclosures or by any of the following means: 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. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. The marking shall be of sufficient durability to withstand the environment involved. 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. Does it require maintenance while energized? Clear Height in front of Panel <480V. OSHA's standard for general electrical requirements (29 CFR 1910.303) includes a section for establishing and maintaining space around electrical panels and other systems that require servicing, adjustments, or maintenance while energized. Working clearances. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. This exception was put in to correspond to 430.107 that requires at least one of the disconnecting means required for a motor and motor controller to be readily accessible. 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. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. This set of code identifies how much clearance is needed around any type of electrical panel based on a number of different factors. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). . 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. 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. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. Electricity has long been recognized as a serious workplace hazard. This letter constitutes OSHA's interpretation of the requirements discussed. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. However, working space is not required in back of equipment such as deadfront switchboards or control assemblies 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. 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. 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. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. The ampere rating of this disconnecting means may not be less than the supply conductor ampacity. The depth shall be as required in Table K-2. Arc welders. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. The initial electrical inspection for a . 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. If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. The disconnecting means shall be operable from a location readily accessible from the X-ray control. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. 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. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. Auxiliary electric equipment, such as motors, transducers, sensors, control devices, and alarms, mounted on an electrolytic cell or other energized surface shall be connected to the premises wiring systems by any of the following means: Multiconductor hard usage or extra hard usage flexible cord; Wire or cable in suitable nonmetallic raceways or cable trays; or. Lighting outlets and points of control. Installations accessible to unqualified persons. 8. 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. The top of the disconnect switch is only 72 inches (6 feet) above the floor. 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. Even if they know how much room in inches is required, they may not be able to properly estimate how much room they are leaving when placing items in the area. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Your scenario and questions, and our replies, follow. Parts of electric equipment that in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material. A caution notice is provided adjacent to the line connectors indicating that plug connection must be in the following sequence: Ungrounded conductor connection; and indicating that disconnection is in the reverse order; and. Working space. 2. 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 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. 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. Open disconnecting devices before tagging. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. Control panels not located in the same space as the drive machine shall be located in cabinets with doors or panels capable of being locked closed. 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