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. Note that our enforcement guidance may be affected by changes to OSHA rules. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). Your question has been restated below for clarity. 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 ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. 2 or larger. Electrically driven or controlled irrigation machines -. 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. It is not an official legal edition of the CFR. 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. 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. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Disconnecting means. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. Carnivals, circuses, fairs, and similar events. Obstructed access to panelboards can prevent personnel from shutting down the source of power in the event of an accident. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. 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. 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. 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. Electric equipment shall be firmly secured to the surface on which it is mounted. The manually operated switch shall be installed adjacent to this equipment. 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. Electrical wiring for temporary lighting, where installed inside of tents and concessions, shall be securely installed, and, where subject to physical damage, shall be provided with mechanical protection. Similarly, panels with 151-600 volts require 42 inches of clearance. The top of the disconnect switch is only 72 inches (6 feet) above the floor. Electric equipment and wiring methods in or on rides, concessions, or other units shall be provided with mechanical protection where such equipment or wiring methods are subject to physical damage. 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. 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. It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. All fluidizing lines-would have to be purged in order to prevent plugging of the line. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Sincerely, ), whichever is greater. Clear Height in front of Panel >480V. Driving machines, motor-generator sets, 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 to prevent starting. Application for variances are covered under 29 CFR Part 1905. Electrolytic cells. 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. 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. The following requirements apply to industrial and commercial laboratory equipment. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them; By placement on a suitable balcony, gallery, or platform so elevated and otherwise located as to prevent access by unqualified persons; or. Power supply circuits and receptacles for portable electric equipment. A disconnecting means shall be provided in the supply circuit. Location. This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. 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. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. Examination. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Not posting required clearances in electrical panel areas, generally falls under this type of violation. The working width around the panel must be at least 30 inches. This paragraph applies to induction and dielectric heating equipment and accessories for industrial and scientific applications, but not for medical or dental applications or for appliances. 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. 1. Type. Equipment installed underwater shall be identified for the purpose. 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). 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. Where one entrance to the working space is permitted under the conditions described in paragraph (h)(4)(i)(A) of this section, the entrance shall be located so that the edge of the entrance nearest the switchboards and control panels is at least the minimum clear distance given in Table S-2 away from such equipment. Dear Mr. Overby: Examination, installation, and use of equipment -. 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. 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. Installations accessible to qualified persons only. The following requirements apply to indoor installations that are accessible to other than qualified persons: The installations shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area to which access is controlled by a lock; Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs; and. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. Condition B - Exposed live parts on one side and grounded parts on the other side. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. Others, such as office workers and sales people, work with electricity indirectly and may also be exposed to electrical hazards. Identification of manufacturer and ratings. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. Mr. William Overby 6. 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. 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. Thank you for your interest in occupational safety and health. Outdoors, it must be GFCI protected. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. Occupational Safety & Health Administration, Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Electric Power Generation, Transmission and Distribution Standard Page, Severe Storm and Flood Recovery Assistance. A variety of possible solutions may be implemented to reduce or eliminate the risk of injury associated with electrical work. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. U0xxx - Generic. "Infeasibility" is considered by OSHA on a case by case, work application basis. What About NFPA 70e Electrical Panel Clearance? Electricity has long been recognized as a serious workplace hazard. 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 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. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. 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. It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. Dedicated space: The space equal to the width and depth of electrical equipment in addition to the space extending from the floor to 6 feet . If anything is found in a spot that is too close to the panel, the items can be moved right away. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. At least one entrance not less than 610 mm (24 in.) Where accessible to unqualified persons, the enclosure for the switch or circuit breaker shall be of the lockable type. 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. For equipment operating at 600 volts, nominal or less to ground, electrical panels must have a minimum of three feet of clearance in front of the panel and a minimum clearance width of 2.5 feet or the width of the equipment, whichever is greater. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. 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. 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. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. 1910.305 (g): Wiring requirements for flexible cords and cables. 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. You're not if you fail to comply with the following three clearance requirements in Sec. 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. Removable links or removable conductors may be used as the disconnecting means. Installation and use. This paragraph applies to equipment operating at 600 volts, nominal, or less. The following requirements apply to outdoor enclosed equipment accessible to unqualified employees: Ventilating or similar openings in equipment shall be so designed that foreign objects inserted through these openings will be deflected from energized parts; Where exposed to physical damage from vehicular traffic, suitable guards shall be provided; Nonmetallic or metal-enclosed equipment located outdoors and accessible to the general public shall be designed so that exposed nuts or bolts cannot be readily removed, permitting access to live parts; Where nonmetallic or metal-enclosed equipment is accessible to the general public and the bottom of the enclosure is less than 2.44 m (8.0 ft) above the floor or grade level, the enclosure door or hinged cover shall be kept locked; and. What Constitutes Clearance Around Electrical Panels? Flexible cords and cables shall be listed for extra-hard usage. This receptacle shall be located not more than 1.98 m (6.5 ft) above the floor, platform, or grade level serving the pool. 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. Induction heating coils shall be protected by insulation or refractory materials or both. 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. If more than one piece of equipment is operated from the same high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a high-voltage switch or equivalent disconnecting means. Approval. Also, from time to time we update our guidance in response to new information. A disconnecting means shall be provided between the runway contact conductors and the power supply. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. 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. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Electrical Safety Orders. Overcurrent protection of electrolytic cell dc process power circuits need not comply with the requirements of 1910.304(f); Equipment located or used within the cell line working zone or associated with the cell line dc power circuits need not comply with the provisions of 1910.304(g); and. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. Does it require maintenance while energized? Working space about electric equipment. Another safety focused agency is the National Fire Protection Association, or NFPA. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. The dimension of the working space in the direction of access to live parts that may require examination, adjustment, servicing, or maintenance while alive shall be a minimum of 762 mm (2.5 ft). On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. 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