Remote crane or hoist controls that may introduce hazardous electrical conditions into the cell line working zone shall employ one or more of the following systems: Pendant pushbutton with nonconductive supporting means and with nonconductive surfaces or ungrounded exposed conductive surfaces; or. Note that our enforcement guidance may be affected by changes to OSHA rules. No provision may be made to open or close this disconnecting means from any other part of the premises. Clearance. 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. Cells used as a source of electric energy and for electroplating processes and cells used for production of hydrogen are not covered by this paragraph. Hundreds of motors would be shutoff. Services shall be installed in accordance with applicable requirements of this subpart, and, in addition, shall comply with the following: Service equipment may not be installed in a location that is accessible to unqualified persons, unless the equipment is lockable; and. 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. The type of enclosure used in a given case shall be designed and constructed according to the hazards associated with the installation. 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. Insulation integrity. This is not only important for avoiding getting fined for violating the requirements, but also for ensuring your facility is as safe as possible. 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. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] What Constitutes Clearance Around Electrical Panels? Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. 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. 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. Durability. Similarly, panels with 151-600 volts require 42 inches of clearance. Eight (8) to ten (10) hours of start-up time could be required to re-load processing bins, fluidizing lines and processing transitions. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. Of course, this means having a lot of different wires and other electrical equipment located in one area. Access and entrance to working 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, All electrical conductors and equipment shall be approved. Disconnecting Means. Examination, installation, and use of equipment -. Cables and mats shall be arranged so as not to present a tripping hazard. 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. 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 paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. 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. Electrically driven or controlled irrigation machines -. 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. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Circuit impedance and other characteristics. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. 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. Mechanical execution of work. 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. 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. When it is necessary to perform work on energized equipment, OSHA 1910.333 (a) (2) requires safety-related work practices to be used and NFPA 70E Article 110.8 (B) (1) requires an Electrical Hazard Analysis before work is performed on live equipment operating at 50 volts and higher. Mr. William Overby Where there are live parts normally exposed on the front of switchboards or motor control centers, the working space in front of such equipment shall not be less than 3 feet (914 mm). Receptacles and their mating plugs for ungrounded equipment may not have provision for a grounding conductor and shall be of a configuration that prevents their use for equipment required to be grounded. Lighting fixtures and lighting outlets installed in the area extending between 1.52 m (5 ft) and 3.05 m (10 ft) horizontally from the inside walls of a pool shall be protected by a ground-fault circuit interrupter unless installed 1.52 m (5 ft) above the maximum water level and rigidly attached to the structure adjacent to or enclosing the pool. 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. 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. 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. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Portable distribution and termination boxes. 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 minimum elevation may be 2.4 m (8.0 ft) for installations built before April 16, 1981, if the nominal voltage between phases is in the range of 601-6600 volts. Subchapter 5. Power supply circuits and receptacles for portable electric equipment. 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 . 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. This letter constitutes OSHA's interpretation of the requirements discussed. The control for these disconnecting means shall be grouped and identified and shall be readily accessible at the principal exit doors. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. 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. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: This letter constitutes OSHA's interpretation of the requirements discussed. 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). Front working space. Another safety focused agency is the National Fire Protection Association, or NFPA. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Boxes shall be designed so that no live parts are exposed to accidental contact. Where a pool is installed permanently at a dwelling unit, at least one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit shall be located a minimum of 3.05 m (10 ft) and not more than 6.08 m (20 ft) from the inside wall of the pool. A disconnecting means shall be provided in the supply circuit. 1910.305 (g): Wiring requirements for flexible cords and cables. Suitability of equipment for an identified purpose may be evidenced by listing, labeling, or certification for that identified purpose. 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. A shunt trip device that opens the fused disconnect or circuit breaker when a switch located in the ride operator's console is closed is a permissible method of opening the circuit. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. A single means to control both the electronic equipment and HVAC system is permitted. Fire exit routes cannot be obstructed [29 CFR 1910.37 (a) (3)] and they cannot become more narrow at any point. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. Not posting required clearances in electrical panel areas, generally falls under this type of violation. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. These markings shall be of sufficient durability to withstand the environment involved. 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. By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. 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. 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. Arcing parts. 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. February 7, 1996 Illumination shall be provided for all working spaces about electric equipment. horizontally shall be provided. 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. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Entrance and access to workspace. The disconnecting means shall be a listed device. Working space. OSHA requirements are set by statute, standards, and regulations. Examination, installation, and use of equipment -. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. Outdoors, it must be GFCI protected. 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. 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. The relevant section of the national electric code here is NEC 110.26. Working space required by this standard may not be used for storage. 6. 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. Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided; Heating effects under all conditions of use; Classification by type, size, voltage, current capacity, and specific use; and. 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. Deteriorating agents. What About NFPA 70e Electrical Panel Clearance? 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. Thank you for your interest in occupational safety and health. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. If anything is found in a spot that is too close to the panel, the items can be moved right away. Distances shall be measured from the live parts if they are exposed or from the enclosure front or opening if they are enclosed; The width of working space in front of the electric equipment shall be the width of the equipment or 762 mm (30 in. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. The marking shall be of sufficient durability to withstand the environment involved. Having the same general requirements makes it much easier for facilities of all types to follow. Richard E. Fairfax, Director 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. The initial electrical inspection for a . Another nice thing about having these standardized requirements is that they apply across national boarders. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. Circuits supplying power to ungrounded receptacles for hand-held, cord- and plug-connected equipment shall meet the following requirements: The circuits shall be electrically isolated from any distribution system supplying areas other than the cell line working zone and shall be ungrounded; The circuits shall be supplied through isolating transformers with primaries operating at not more than 600 volts between conductors and protected with proper overcurrent protection; The secondary voltage of the isolating transformers may not exceed 300 volts between conductors; and. Other questions you can expect from an OSHA inspector include: Lighting fixtures, lighting outlets, and ceiling suspended (paddle) fans. 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. 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. Control power is off on a large number of machines. Most people think only about the area directly in front of the electrical panel. Dayton, Ohio 45420 This means you cannot place machinery or other equipment in the space around an electrical panel without making sure that it meets the NEC working clearance requirements. Electrolytic cells. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Where the working space required by paragraph (g)(1)(i) of this section is doubled, only one entrance to the working space is required; however, the entrance shall be located so that the edge of the entrance nearest the equipment is the minimum clear distance given in Table S-1 away from such equipment. Minimum clear distances may be 0.7 m (2.5 ft) for installations built before April 16, 1981. 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. 508 Carpenter Road Horizontal clearance between the conductor and Building. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. 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. 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). 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. Lock out/tag out after disconnecting, before voltage testing. 1. other equipment foreign to the electrical installation shall be located in . 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). The lighting outlets shall be arranged so that persons changing lamps or making repairs on the lighting system will not be endangered by live parts or other equipment. Electrical Safety. 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. OSHA requirements are set by statute, standards and regulations. 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. 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. Rather than move the motor control center at a cost of two million dollars, can a "safe job procedure" which is audited periodically be considered an acceptable alternative or is a variance required? 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. 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.
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