Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Condition B - Exposed live parts on one side and grounded parts on the other side. Fire exit routes cannot be obstructed [29 CFR 1910.37 (a) (3)] and they cannot become more narrow at any point. 2. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. In addition, from time to time we update our guidance in response to new information. Dear Mr. Schuldt: 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. In locations where electric equipment would be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. 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. All splices and joints and the free ends of conductors shall be covered with an insulation equivalent to that of the conductors or with an insulating device designed for the purpose. Except as required or permitted elsewhere in this subpart, the dimension of the working space in the direction of access to live parts operating at 600 volts or less and likely to require examination, adjustment, servicing, or maintenance while alive shall not be less than indicated in Table K-1. 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. 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. 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. 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. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. These are generic codes which may not apply to all vehicles and we recommend you . However, a lighting fixture or lighting outlet that was installed before April 16, 1981, may be located less than 1.52 m (5 ft) measured horizontally from the inside walls of a pool if it is at least 1.52 m (5 ft) above the surface of the maximum water level and is rigidly attached to the existing structure. July 26, 2004 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. A disconnecting means shall be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder. Identification of disconnecting means and circuits. Protection of electric equipment. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. U0xxx - Generic. The work space shall be clear and extend from the grade, floor, or platform to the height required by paragraph (g)(1)(vi) of this section. The disconnecting means shall be readily accessible and capable of being locked in the open position. On escalators and moving walks, the disconnecting means shall be installed in the space where the controller is located. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. However, switches or other equipment operating at 600 volts, nominal, or less, and serving only equipment within the high-voltage vault, room, or enclosure may be installed in the high-voltage enclosure, room, or vault if accessible to qualified persons only. Examination, installation, and use of equipment -. Hoppers and transitions could plug up with product. Also, from time to time we update our guidance in response to new information. 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. 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 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. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. horizontally shall be provided. Installations accessible to qualified persons only. horizontally shall be provided. Lock out/tag out after disconnecting, before voltage testing. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. Electric equipment may not be used unless the following markings have been placed on the equipment: The manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product may be identified; and. They bring all the electrical lines into one centralized location so that the main power source can feed them. Warning labels or signs that read DANGER - HIGH VOLTAGE - KEEP OUT shall be attached to the equipment and shall be plainly visible where persons might contact energized parts when doors are opened or closed or when panels are removed from compartments containing over 250 volts ac or dc. The width of Panel or 0.762 Meter which is Greater. Other questions you can expect from an OSHA inspector include: Working clearances. 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. Enclosure for electrical installations. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. (10 cm) for every 10 kV over that voltage. Installation and use. The disconnecting means shall be a listed device. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. 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. The ampere rating of this disconnecting means may not be less than the supply conductor ampacity. 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). When installing or updating an electrical panel, it is important to make sure that there is plenty of room around the panel for the electrician to safely work. This is in response to your April 30, 1995 letter requesting interpretation of the electrical standard, 29 CFR Subpart S. Your letter, which was addressed to Mr. Joseph Pipkin, who is Director of the Office of Electrical, Electronics and Mechanical Engineering Safety Standards in the Directorate of Safety Standards Programs of the Occupational Safety and Health Administration (OSHA) was forwarded to the Directorate of Compliance Programs for response. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. Capable of accepting a lock. Your letter has been referred to the Directorate of Enforcement Program's (DEP's) Office of General Industry Enforcement for an answer to your question regarding clearances from electrical equipment. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). 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. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. Motor controllers may be located outside the spaces otherwise required by paragraph (c) of this section, provided they are in enclosures with doors or removable panels capable of being locked closed and the disconnecting means is located adjacent to or is an integral part of the motor controller. OSHA requirements are set by statute, standards and regulations. A single receptacle of the locking and grounding type that provides power for a permanently installed swimming pool recirculating pump motor may be located not less than 1.52 m (5 ft) from the inside walls of a pool. 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. Because this cabinet you saw is located near an exit door, let's first look at OSHA's general requirements for exit routes, emergency action plans and fire prevention plans [20 CFR 1910.37-39]. They also Secondly, installation can be tricky if one switches from an electric unit to a hybrid gas water heater or vice versa because of the required retrofitting. 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. 600 Volts, nominal, or less. Permanent and conspicuous warning signs shall be provided, reading substantially as follows: Pipes or ducts that are foreign to the electrical installation and that require periodic maintenance or whose malfunction would endanger the operation of the electrical system may not be located in the vicinity of service equipment, metal-enclosed power switchgear, or industrial control assemblies. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. This is necessary because it is not practical to run dozens, or even hundreds, of different electrical lines directly into the main circuit. When employees are trained to work safely, through the requirements, they should be able to anticipate and avoid injury from job related hazards. What Constitutes Clearance Around Electrical Panels? Where the driving machine or the motor-generator set is located in a remote machinery space, a single means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. The disconnecting means shall be within sight of the equipment served. Application. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. This page provides information that may aid in controlling electrical hazards in the workplace. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. No provision may be made to open or close this disconnecting means from any other part of the premises. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. 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. 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. 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. Exposed live parts on one side and grounded parts on the other side. Another safety focused agency is the National Fire Protection Association, or NFPA. 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. On elevators without generator field control, the disconnecting means shall be located within sight of the motor controller. 5. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that must be interrupted. The disconnecting means shall be a switch or circuit breaker, and its rating may not be less than that necessary to accommodate overcurrent protection. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. 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 supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. Directorate of Enforcement Programs Clearance is required in the direction of access for operation, that is in the front. 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. Portable distribution and termination boxes. beyond the front of the electric equipment. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. A good start is to make sure that you have a written policy that everyone in the facility is aware of that makes it clear that inventory and other items may not be placed around any electrical panel. The tape can be placed down in the proper spots to make sure you get immediate results. The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. In addition, from time to time we update our guidance in response to new information. 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. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. Electrical installations in a vault, room, or closet or in an area surrounded by a wall, screen, or fence, access to which is controlled by lock and key or other approved means, are considered to be accessible to qualified persons only. The control for these disconnecting means shall be grouped and identified and shall be readily accessible at the principal exit doors. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. 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. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. 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. Power supply circuits and receptacles for portable electric equipment. In previous NEC editions, transformers didn't require a disconnecting means. The overcurrent protective devices, the total impedance, the component short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without the occurrence of extensive damage to the electrical components of the circuit. Visit the Electric Power Generation, Transmission and Distribution Standard Page The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. 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. 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. It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. Unless identified for use in the operating environment, no conductors or equipment shall be located in damp or wet locations; where exposed to gases, fumes, vapors, liquids, or other agents that have a deteriorating effect on the conductors or equipment; or where exposed to excessive temperatures. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. 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. Inside tents and concessions. Switchboards, panelboards, and distribution boards installed for the control of light and power circuits, and motor control centers shall be located in dedicated spaces and protected from damage. 1910.305 (g): Wiring requirements for flexible cords and cables. 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. Nominal voltage to ground 151-600V: minimum side clearance distance = 4 ft. (1.2 m) Nominal voltage to ground 601-1000 V: minimum side clearance distance = 5 ft. (1.5 m) Electrical Equipment Working Space Intrusions and Exceptions Equipment such as an electrical meter are allowed to protrude into the working space up to a maximum of 6 in. You must also have a 120vac 15 amp service outlet within 25ft. Each sign and outline lighting system, or feeder circuit or branch circuit supplying a sign or outline lighting system, shall be controlled by an externally operable switch or circuit breaker that will open all ungrounded conductors. Electricity has long been recognized as a serious workplace hazard. 8. Minimum clearance of 3 inches overhead and 2 inches laterally shall be provided and maintained between crane and obstructions in conformity with Crane Manufacturers Association of America, Inc, Specification No. To put it simply, you must have a policy in place that will ensure that any electrical panel in your facility can be easily accessed and worked on at all times. 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.) Cooling. 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. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. Deteriorating agents. This letter constitutes OSHA's interpretation of the requirements discussed. Arcing parts. 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. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. Clear spaces. For equipment rated 1200 amperes or more and over 1.83 m (6.0 ft) wide, containing overcurrent devices, switching devices, or control devices, there shall be one entrance not less than 610 mm (24 in.) Obstructed access to panelboards can prevent personnel from shutting down the source of power in the event of an accident. All electrical conductors and equipment shall be approved. Employers may only use portable distribution and termination boxes that meet the following requirements: Occupational Safety & Health Administration. 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. As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6 feet of headroom space. Electric equipment shall be firmly secured to the surface on which it is mounted. Open disconnecting devices before tagging. Safety electrical work practices; motor disconnects;work clearances. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. Of course, this means having a lot of different wires and other electrical equipment located in one area. If the disconnect for a piece of HVAC equipment doesn't have any fuses, then can you make the argument the switch will not require maintenance so that 3' clearance isn't required? Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. 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, Note to paragraph (h)(5)(vi) of this section: Piping and other facilities are not considered foreign if provided for fire protection of the electrical installation. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. 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. Conductors shall be spliced or joined with splicing devices designed for the use or by brazing, welding, or soldering with a fusible metal or alloy. 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. 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. Induction heating coils shall be protected by insulation or refractory materials or both. 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. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. Doors or covers giving access to uninsulated parts of indoor signs or outline lighting exceeding 600 volts and accessible to other than qualified persons shall either be provided with interlock switches to disconnect the primary circuit or shall be so fastened that the use of other than ordinary tools will be necessary to open them. At least one entrance not less than 610 mm (24 in.) Single conductor cable shall be size No. 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. 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. 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. Most people think only about the area directly in front of the electrical panel. Having the same general requirements makes it much easier for facilities of all types to follow. At least one entrance shall be provided to give access to the working space about electric equipment. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. 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. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). 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 . Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). Outdoors, it must be GFCI protected. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? Examination. Terms You Should Know: Working space: The front clearance, side clearance, and height clearance requirements for electrical equipment that provide a safe area for maintenance, inspections, and other work. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. 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. 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. Every 10 kV over that voltage same box of persons using or likely come... & # x27 ; s an added article titled 230.85 Emergency disconnects we recommend.... That is in the proper spots to make sure you get immediate results to panelboards can prevent personnel osha electrical disconnect clearance requirements. 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