The lighting outlets shall be so arranged that persons changing lamps or making repairs on the lighting system will not be endangered by live parts or other equipment. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. Condition B - Exposed live parts on one side and grounded parts on the other side. 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. 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, For example, a switchboard is located next to a disconnect (safety) switch. Arcing parts. Breaker panels should be easily accessible and should never be blocked. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. Q: Does OSHA standard 1910.303 include all electrical panels (i.e., electrical cabinets on machinery, electrical disconnects and breaker panels), or is it strictly related to breaker panels? Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. Arc welders. General. 2932 Hazel Ave. Electric equipment shall be firmly secured to the surface on which it is mounted. Monitoring System (TPMS) Sensor Training in this section. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. Requesting clearance should be the first step. This means if you have an inspection, you can count on the fact that the OSHA electrical panel clearance will be measured by the OSHA inspector to make sure that you are in compliance. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. The disconnecting means shall be readily accessible and capable of being locked in the open position. 8. Control panels. Electricity has long been recognized as a serious workplace hazard. Visit the Electric Power Generation, Transmission and Distribution Standard Page Inside tents and concessions. 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. Dear Mr. Schuldt: Where accessible to unqualified persons, the enclosure for the switch or circuit breaker shall be of the lockable type. If the voltage is higher than 50kV, the clearance shall be increased 4 in. 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. 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. Classification by type, size, voltage, current capacity, specific use. Taking the time to make sure that nothing is in these areas will help to avoid any type of penalties that may be issued if you are inspected by OSHA or other agencies. Outdoors, it must be GFCI protected. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. 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. Mounting. Question 1: Paragraph 1910.333(a)(1) requires that live parts to which an employee may be exposed must be deenergized before the employee works on or near them, unless the employee can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations. Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. 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. What is the residential electrical panel clearance requirements? The ampere rating of this disconnecting means may not be less than the supply conductor ampacity. Protection of electric equipment. Illumination shall be provided for all working spaces about electric equipment. Concrete, brick, and tile walls are considered as grounded surfaces. 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. 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. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. 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. 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 . OSHA requirements are set by statute, standards and regulations. Where rear access is required to work on the deenergized parts on the back of enclosed equipment, a minimum working space 762 mm (30 in.) The manually operated switch shall be installed adjacent to this equipment. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. beyond the front of the electric equipment. Your scenario and questions, and our replies, follow. The Electrical Safety Authority ( ESA) was established in 1999 . The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. The following requirements apply to industrial and commercial laboratory equipment. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. Each ride and concession shall be provided with a fused disconnect switch or circuit breaker located within sight and within 1.83 m (6 ft) of the operator's station. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Location. 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. Front working space. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. 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. We hope you find this information helpful. Lock out/tag out after disconnecting, before voltage testing. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. 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. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. Therapeutic pools in health care facilities are exempt from these provisions. Where doors are used giving access to voltages of over 1000 volts ac or dc, either mechanical lockouts with a disconnecting means to prevent access until circuit parts within the cubicle are deenergized, or both door interlocking and mechanical door locks, shall be provided. 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. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. 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. 2. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. The markings required by paragraphs (f)(1) and (f)(2) of this section shall be of sufficient durability to withstand the environment involved. 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. Open disconnecting devices before tagging. 1910.303 (g) (1) (vi) (B) For installations built on or after August 13, 2007, 1.98 m (6.5 ft), except that where the electrical equipment exceeds 1.98 m (6.5 ft) in height, the minimum headroom may not be less than the height of the equipment. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. Others will place the square around the area and then use diagonal stripes of floor markings to fill out the area, which makes it even more clear that nothing should be put in that place. Cord- and plug-connected equipment. Interrupting rating. In addition, enclosed please find a copy of 29 CFR 1910.303(g) and 1910.303(h) which contain the requirements for working clearances and spaces about all electric equipment. 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. Electricity has long been recognized as a serious workplace hazard. Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. 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. 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. All panel controls shall be of dead-front construction. It also helps by segmenting the power off in a way that prevents a full power outage when there is an issue in one area. This paragraph covers the installation of portable wiring and equipment, including wiring in or on all structures, for carnivals, circuses, exhibitions, fairs, traveling attractions, and similar events. 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. Electrolytic cells. Where energized parts are exposed, the minimum clear workspace shall not be less than 6 feet 6 inches (1.98 m) high (measured vertically from the floor or platform), or less than 3 feet (914 mm) wide (measured parallel to the equipment). Clear Height in front of Panel >480V. 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. 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. Note that our enforcement guidance may be affected by changes to OSHA rules. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant. Equipment intended to interrupt current at fault levels shall have an interrupting rating sufficient for the nominal circuit voltage and the current that is available at the line terminals of the equipment. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. John B. Placed within view of the runway contact conductors. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: On switchboard and control panels exceeding 48 inches (1.22 m) in width, there shall be one entrance at each end of such board where practicable. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone. 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. Outdoor electrical installations having exposed live parts shall be accessible to qualified persons only. "Infeasibility" is considered by OSHA on a case by case, work application basis. All fluidizing lines-would have to be purged in order to prevent plugging of the line. 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. This letter constitutes OSHA's interpretation of the requirements discussed. 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. Lightning protection. Ungrounded portable electric equipment shall be distinctively marked and shall employ plugs and receptacles of a configuration that prevents connection of this equipment to grounding receptacles and that prevents inadvertent interchange of ungrounded and grounded portable electric equipment. Application for variances are covered under 29 CFR Part 1905. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). Grounding should be the last of these steps. 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. These are generic codes which may not apply to all vehicles and we recommend you . 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. Mr. Schuldt: Where accessible to unqualified persons, the enclosure for the or... 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