Pan Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. Auxiliary nonelectrical connections. 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. The disconnecting means shall be capable of being locked in the open position. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. Electric equipment provided with ventilating openings shall be installed so that walls or other obstructions do not prevent the free circulation of air through the equipment. Note that our enforcement guidance may be affected by changes to OSHA rules. Note that our enforcement guidance may be affected by changes to OSHA rules. 2.0 Meter. 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. 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. For equipment connected to a 120-volt branch circuit of 30 amperes or less, a grounding-type attachment plug cap and receptacle of proper rating may serve as a disconnecting means. 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. 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. 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. 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. The width of Panel or 0.762 Meter which is Greater. 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. Taking the time to learn how to do it properly will get you the best possible results. 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. Electric equipment shall be firmly secured to the surface on which it is mounted. 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. Flexible cords and cables shall be listed for extra-hard usage. 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. Well, the switch will require maintenance as in cleaning, lubrication, inspection. Single conductor cable shall be size No. By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. Interrupting rating. The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. Keep the fire inside the fireplace. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. 2 or larger. Diffraction- and irradiation-type equipment shall have a pilot light, readable meter deflection, or equivalent means to indicate when the equipment is energized, unless the equipment or installation is effectively enclosed or is provided with interlocks to prevent access to live current-carrying parts during operation. The initial electrical inspection for a . 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. In addition, from time to time we update our guidance in response to new information. 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. 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. On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. Dear Mr. Overby: Does it require maintenance while energized? Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. February 7, 1996 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. Here's a broad breakdown of space requirements when planning around electrical panels: Entrance and access to workspace. Reply: Deenergizing the 110 volt control circuit in the above scenario appears to be infeasible as discussed in Note 2 following paragraph 1910.333(a)(1). Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. 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. Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. 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. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. 0.9 Meter. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: The following requirements apply to industrial and commercial laboratory equipment. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. Maximum Number of Disconnects (i.e. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Mechanical execution of work. 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. 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. Space about electric equipment. Examination. Breaker panels should be easily accessible and should never be blocked. Monitoring System (TPMS) Sensor Training in this section. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. Defiance, Ohio 43512 Working with electricity can be dangerous. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. 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. Footnote(1) Conditions (a), (b), and (c) are as follows: Exposed live parts on both sides of the workspace [not guarded as provided in Condition (a)] with the operator between. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. Miles, Jr., Director 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. 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. 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. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. 7. This paragraph applies to equipment operating at 600 volts, nominal, or less. 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. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. Where bare energized parts at any voltage or insulated energized parts above 600 volts, nominal, to ground are located adjacent to such entrance, they shall be suitably guarded. Electrical panels are an essential component in any facility. This is not only important for avoiding getting fined for violating the requirements, but also for ensuring your facility is as safe as possible. 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. Electrical installations having exposed live parts shall be accessible to qualified persons only and shall comply with the applicable provisions of paragraph (j)(3) of this section. The area must not only remain completely clear of items at all times, but it also needs to be accessible. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. This is for ANY electrical panel including the corner of the condenser where the wiring enters. Working space. Identification of disconnecting means and circuits. General. A warning sign worded as required in paragraph (c)(8) of this section shall be mounted on or next to the disconnecting means where interconnections between controllers are necessary for the operation of the system on multicar installations that remain energized from a source other than the one disconnected. The disconnecting means shall be readily accessible and capable of being locked in the open position. In outdoor pool areas, lighting fixtures, lighting outlets, and ceiling-suspended (paddle) fans may not be installed over the pool or over the area extending 1.52 m (5 ft) horizontally from the inside walls of a pool unless no part of the lighting fixture of a ceiling-suspended (paddle) fan is less than 3.66 m (12 ft) above the maximum water level. D-TPMS, Service required and DTC's DTC Diagnostic Trouble Codes with D-TPMS can be identified by one of the following VDN codes:. 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. Disconnecting means for runway conductors. 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. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Interlock switches shall be used on all hinged access doors, sliding panels, or other such means of access to the applicator, unless the applicator is an induction heating coil at dc ground potential or operating at less than 150 volts ac. If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Of course, this means having a lot of different wires and other electrical equipment located in one area. 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. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. 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. "Infeasibility" is considered by OSHA on a case by case, work application basis. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. 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. Condition B - Exposed live parts on one side and grounded parts on the other side. A fence may not be less than 2.13 m (7.0 ft) in height or a combination of 1.80 m (6.0 ft) or more of fence fabric and a 305-mm (1-ft) or more extension utilizing three or more strands of barbed wire or equivalent. Walls constructed of concrete, brick, or tile are considered to be grounded. 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. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. 2. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. Note to paragraph (b)(8)(i) of this section:Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials are not considered secure means of fastening electric equipment. Question 2: A motor control center does not meet Table S-1 work clearances required under paragraph 1910.303(g)(1) when working on live parts operating at 600 volts or less. July 26, 2004 What Constitutes Clearance Around Electrical Panels? Group 1. Splices. 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. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. Unless isolated from equipment by height or physical enclosures or covers that will afford adequate mechanical protection from vehicular traffic or accidental contact by unauthorized personnel or that complies with paragraph (g)(1)(vii)(A)(2) of this section, piping, ducts, or equipment foreign to the electrical installation may not be located in this area; The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to avoid damage from condensation, leaks, or breaks in such foreign systems. 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. Signs and outline lighting systems located within fountains shall have the disconnect located at least 1.52 m (5.0 ft) from the inside walls of the fountain. However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 153 mm (6 in.) (150 mm) For serious, other-than-serious, and posting requirement violations, OSHA issues a fine amount of $14,502 per violation. Portable distribution and termination boxes. Single-car and multicar installations. 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 identified for the purpose. 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. Insulation integrity. OSHA requirements are set by statute, standards and regulations. 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. Obstructed access to panelboards can prevent personnel from shutting down the source of power in the event of an accident. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. Sources that provide helpful information about electrical in the workplace. The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, path to ground missing or discontinuous, equipment not used in manner prescribed, and improper use of extension and flexible cords. Readily accessible and operable from the ground or floor level; Arranged to be locked in the open position; and. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. However, No. All electrical conductors and equipment shall be approved. 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. 1910.305 (g): Wiring requirements for flexible cords and cables. Specific purpose equipment and installations. The dielectric breakdown level is further influenced by relative humidity, temperature, and degree of pollution in the environment. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. 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. The relevant section of the national electric code here is NEC 110.26. All panel controls shall be of dead-front construction. 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. Where installed outdoors, the box shall be of weatherproof construction and mounted so that the bottom of the enclosure is not less than 152 mm (6 in.) Installations accessible to qualified persons only. 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. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. 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. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. Thank you for your interest in occupational safety and health. 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. Conditions A, B, and C are as follows: Condition A - Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by suitable wood or other insulating material. 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. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. This letter constitutes OSHA's interpretation of the requirements discussed. Distances shall be measured from the live parts if they are exposed, or from the enclosure front or opening if the live parts are enclosed. Another nice thing about having these standardized requirements is that they apply across national boarders. Directorate of Enforcement Programs 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. 3. 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. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. Installations accessible to unqualified persons. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. The provisions of paragraphs (j)(2), (j)(3), and (j)(4) of this section do not apply to equipment on the supply side of the service conductors. Sincerely, If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. Most people think only about the area directly in front of the electrical panel. Electrolytic cells. If remote controls are used for applying power, a selector switch shall be provided and interlocked to provide power from only one control point at a time. 508 Carpenter Road At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Where the disconnecting means is out of the line of sight from any section that may be energized, the disconnecting means shall be capable of being locked in the open position. 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. Working space for equipment likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the following dimensions, except as required or permitted elsewhere in this subpart: The depth of the working space in the direction of access to live parts may not be less than indicated in Table S-1. AOP Forum Rules: Rules For Equipment Owners. 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. 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. Approval. When employees are trained to work safely, through the requirements, they should be able to anticipate and avoid injury from job related hazards. 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. Sincerely, Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts shall have a single means for disconnecting all ungrounded main power supply conductors for each unit. 8. Circuit impedance and other characteristics. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. What is the residential electrical panel clearance requirements? Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. 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