Type. Conductors and equipment used on circuits exceeding 600 volts, nominal, shall comply with all applicable provisions of paragraphs (a) through (g) of this section and with the following provisions which supplement or modify those 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. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Completed wiring installations shall be free from short circuits and from grounds other than those required or permitted by this subpart. 1910.6, (formerly the Electric Overhead Crane Institute, Inc). Suitable enclosures or guards must be provided to prevent damage to this equipment. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. ), whichever is greater. Access and entrance to working space. Carnivals, circuses, fairs, and similar events. Disconnecting means. 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. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. 3. Other markings giving voltage, current, wattage, or other ratings as necessary. 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. This is why OSHA has put a requirement that all electrical panels have a minimum of three feet (36 inches) of room from the front of the panel to the nearest obstacle . Sincerely, wide and 1.98 m (6.5 ft) high at each end of the working space, except that: Where the location permits a continuous and unobstructed way of exit travel, one means of exit is permitted; or. Limit switch. 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. Arc welders. Induction and dielectric heating equipment. 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.) Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. 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. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. If deenergizing the control circuit(s) is infeasible, paragraph 1910.333(c)(2) would apply to work on or near the 110 volt control circuit(s). This letter constitutes OSHA's interpretation of the requirements discussed. 61, which is incorporated by reference as specified in Sec. 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. John B. Installations accessible to qualified persons only. 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. The disconnecting means shall be within sight of the equipment served. If more than one dc cell line process power supply serves the same cell line, a disconnecting means shall be provided on the cell line circuit side of each power supply to disconnect it from the cell line circuit. horizontally shall be provided. Open disconnecting devices before tagging. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Electricity has long been recognized as a serious workplace hazard. Filter by. All fluidizing lines-would have to be purged in order to prevent plugging of the line. Enclosure for electrical installations. 600 Volts, nominal, or less. NFPA 70E, Standard for Electrical Safety in the Workplace, Section 110.3 requires that all equipment be placed into an electrically safe work condition (ESWC) unless there is proper justification for the equipment to be energized. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. While OSHA is only followed in the United States, NFPA is a non-governmental organization. The disconnecting means shall be readily accessible and capable of being locked in the open position. Examination, installation, and use of equipment -. Single-car and multicar installations. Even in countries that do not have strict regulations when it comes to electrical panel clearance will often voluntarily choose to follow the recommendations found in NFPA 70e. A new section, 450.14, requires a disconnecting means for most transformers. 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. Control panels. 1910.305 (g): Wiring requirements for flexible cords and cables. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. Of course, it is also important to try to determine who placed the item there so that they can be provided with the relevant training to ensure it does not happen again. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. The width of Panel or 0.762 Meter which is Greater. 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. 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. Hot glue machines would be shutdown and the glue would set. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. Entrance and access to workspace. Condition B - Exposed live parts on one side and grounded parts on the other side. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably guarded. 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. Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. Also, from time to time we update our guidance in response to new information. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. Exposed live parts on one side and grounded parts on the other side. Conductors shall be spliced or joined with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] It is also easy to verify. Reply: 29 CFR 1910.303(g)(2)(ii) and 1910.303(h)(2)(ii) address the protection of electric equipment that may be exposed to physical damage. Directorate of Enforcement Programs This paragraph applies to electric wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools and fountains; hydro-massage bathtubs, whether permanently installed or storable; and metallic auxiliary equipment, such as pumps, filters, and similar equipment. There shall also be a similar means to disconnect the power to all dedicated heating, ventilating, and air-conditioning (HVAC) systems serving the room and to cause all required fire/smoke dampers to close. This paragraph applies to equipment operating at 600 volts, nominal, or less. 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. Illumination shall be provided for all working spaces about electric equipment. In previous NEC editions, transformers didn't require a disconnecting means. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. President, Safety Specialties Incorporated A clearance of at least 3 feet is required for equipment using 120 to 250 volts. 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. 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. Maximum Number of Disconnects (i.e. 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. Installation and use. Application for variances under Paragraph 1910.11 must include a statement showing how the conditions, practices, means, methods, operations, or processes used or proposed to be used would provide employment and places of employment to employees which are as safe and healthful as those required under the standard from which a variance is sought. 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