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). 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. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. 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. Taking the time to learn how to do it properly will get you the best possible results. 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. 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. 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. All electrical conductors and equipment shall be approved. The area must not only remain completely clear of items at all times, but it also needs to be accessible. 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. 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. Keep the fire inside the fireplace. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. 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. Induction and dielectric heating equipment. Examination, installation, and use of equipment -. 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 insulating materials. 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. 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. The width of Panel or 0.762 Meter which is Greater. Defiance, Ohio 43512 If anything is found in a spot that is too close to the panel, the items can be moved right away. Cables and mats shall be arranged so as not to present a tripping hazard. Capable of accepting a lock. 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. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. Sincerely, 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. If sprinklers are installed in hoistways, machine rooms, or machinery spaces, the disconnecting means may automatically open the power supply to the affected elevators prior to the application of water. 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. 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. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. 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. This would permit the motor disconnect to be located above 6'7" Chris Dennis Alwon Moderator Staff member Location Chapel Hill, NC Occupation Retired Electrical Contractor The disconnecting means shall be within sight of the equipment served. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. What About NFPA 70e Electrical Panel Clearance? When looking into electrical panel clearance safety, you need to start by looking at the requirements put in place by the national electric code, or NEC. D-TPMS, Service required and DTC's DTC Diagnostic Trouble Codes with D-TPMS can be identified by one of the following VDN codes:. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be guarded. No provision may be made to open or close this disconnecting means from any other part of the premises. 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. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant. This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. All fluidizing lines-would have to be purged in order to prevent plugging of the line. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. A disconnecting means shall be provided between the runway contact conductors and the power supply. 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. Working clearances. 1910.306 - Specific purpose equipment and installations. 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 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. 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. Lock out/tag out after disconnecting, before voltage testing. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. Breaker panels should be easily accessible and should never be blocked. OSHA Electrical Panel Clearance Requirements. (150 mm) 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. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. other equipment foreign to the electrical installation shall be located in . Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. The entrances to all buildings, rooms or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal, shall be kept locked or shall be under the observation of a qualified person at all times. 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. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. Motor controller enclosures for escalators or moving walks may be located in the balustrade on the side located away from the moving steps or moving treadway. 2. Outdoor electrical installations having exposed live parts shall be accessible to qualified persons only. Motors and appliances. 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. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. Working space required by this subpart shall not be used for storage. Location. Where rear access is required to work on deenergized parts on the back of enclosed equipment, a minimum working space of 762 mm (30 in.) The disconnecting means shall be located where it is readily accessible to qualified persons. 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. 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. 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. Mechanical execution of work. 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. 2. Miles, Jr., Director Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. Completed wiring installations shall be free from short circuits and from grounds other than those required or permitted by this subpart. The manually operated switch shall be installed adjacent to this equipment. Minimum Clearance Around Electrical Panels (Carrying 600 Volts or Less) Insufficient clearance around electrical panels is one of the many electrical hazards that can endanger worker safety. Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. The disconnecting means shall be a listed device. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. This letter constitutes OSHA's interpretation of the requirements discussed. Arcing parts. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. Clear spaces. 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. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. Cord connectors may not be laid on the ground unless listed for wet locations. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. Limit switch. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. 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. 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. Three rules from the general industry electrical standard are among Oregon OSHA's top 25 violations every year: 1910.303 (b): Examination, installation, and use of equipment. Horizontal clearance between the conductor and Building. 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. On escalators and moving walks, the disconnecting means shall be installed in the space where the controller is located. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. Since electrical fires are one of the biggest risks that a facility can face, it should come as no surprise to find that the NFPA has requirements in this area. Occupational Safety & Health Administration. 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. 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. Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of 30 inches (762 mm) horizontally shall be provided. Grounding should be the last of these steps. Electrical panels are an essential component in any facility. 4. 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. In addition, from time to time we update our guidance in response to new information. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. 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. No fixed work platform has been provided for servicing the unit. A wall, screen, or fence less than 8 feet (2.44 m) in height is not considered adequate to prevent access unless it has other features that provide a degree of isolation equivalent to an 8-foot (2.44-m) fence. Another safety focused agency is the National Fire Protection Association, or NFPA. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. 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. Materials such as solder, fluxes, inhibitors, and compounds, where employed, shall be suitable for the use and shall be of a type that will not adversely affect the conductors, installation, or equipment. Group 1. Note that our enforcement guidance may be affected by changes to OSHA rules. 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 . The working width around the panel must be at least 30 inches. 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. 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. Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. 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. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." Open disconnecting devices before tagging. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). If we can be of further assistance, please contact the Office of General Industry [at (202) 693-1850]. . Arc welders. Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. Monitoring System (TPMS) Sensor Training in this section. Protection of electric equipment. No marks or blemishes on wheel faces. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. President, Safety Specialties Incorporated On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. For failure to abate violations, the penalty amount is $14,502 per day beyond the abatement date. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. 600 Volts, nominal, or less. 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. Cooling. 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. 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. OSHA requirements are set by statute, standards, and regulations. 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. Where the driving machine is located in a remote machinery space, a single disconnecting means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. Approval. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. 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. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. 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. Inside tents and concessions. 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. The OSHA training requirements for electrical safety. Similarly, panels with 151-600 volts require 42 inches of clearance. Installation and use. 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. Arcing parts. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. 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. This could be literally hundreds of machines. 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. 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. OSHA's position that the main or emergency switches must be capable of being locked out. 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. Does it require maintenance while energized? In electric equipment rooms, the illumination may not be controlled by automatic means only. Means from any other part of the premises be located where it is readily to. Specified in Table K-3 when the system is put back into production there a. 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