Electrical equipment shall not be used unless the manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product may be identified is placed on the equipment and unless other markings are provided giving voltage, current, wattage, or other ratings as necessary. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. 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. Preventing Obstructions Around Electrical Panels, NEC 110.26 specifies is that all electrical panels, the NFPA 70e electrical panel clearance requirements, Floor Marking for Electrical Panel Compliance, Occupational Safety and Health Administration (OSHA). Mr. John C. (Jack) Schuldt, Sr. OSHA's position that the main or emergency switches must be capable of being locked out. Portable distribution and termination boxes. 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. Most people think only about the area directly in front of the electrical panel. Durability of markings. 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. Doors or detachable panels shall be employed for internal access. For installations other than equipment described in paragraph (h)(2)(v) of this section, a wall, screen, or fence shall be used to enclose an outdoor electrical installation to deter access by persons who are not qualified. At first glance many people would read the NEC electrical panel clearance requirements and assume that it simply means that you cannot put any additional equipment within the set amount of space. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. 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. 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? X-Ray equipment. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 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. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. Electrical panels are an essential component in any facility. 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. Except as elsewhere required or permitted by this standard, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by use of approved cabinets or other forms of approved enclosures or by any of the following means: 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. 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. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. No provision may be made to close this disconnecting means automatically (that is, power may only be restored by manual means). Hoppers and transitions could plug up with product. Suitable enclosures or guards must be provided to prevent damage to this equipment. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Space about electric equipment. This paragraph applies to equipment operating at 600 volts, nominal, or less. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). 2 or larger. The overcurrent protection may not exceed the ampere rating of the receptacle, except as permitted in 1910.305(j)(4) for motor loads; Where single-pole connectors are used, they shall comply with the following: Where ac single-pole portable cable connectors are used, they shall be listed and of the locking type. 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. A disconnecting means shall be provided in the supply circuit. By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. 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. 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. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. horizontally shall be provided. Detachable panels not normally used for access to such parts shall be fastened in a manner that will make them difficult to remove (for example, by requiring the use of tools). It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. 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. 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. 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.) Control panels not located in the same space as the drive machine shall be located in cabinets with doors or panels capable of being locked closed. Application for variances are covered under 29 CFR Part 1905. Filter by. Splices. Therapeutic pools in health care facilities are exempt from these provisions. All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. 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. This letter constitutes OSHA's interpretation of the requirements discussed. 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. Electrical Safety. Inside tents and concessions. However, working space is not required in back of equipment such as deadfront switchboards or control assemblies where there are no renewable or adjustable parts (such as fuses or switches) on the back and where all connections are accessible from locations other than the back. The disconnecting means shall be a listed device. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. For equipment operating at 600 volts, nominal or less to ground, electrical panels must have a minimum of three feet of clearance in front of the panel and a minimum clearance width of 2.5 feet or the width of the equipment, whichever is greater. 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. For indoor installation, the dedicated space shall comply with the following: The space equal to the width and depth of the equipment and extending from the floor to a height of 1.83 m (6.0 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. A simple way to meet electrical panel clearance requirements is to use floor markings. Identification of manufacturer and ratings. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. However, No. Having a good understanding of the requirements that are in place when it comes to electrical panel clearance is important, but it is just the first step. 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. Electrolytic cells. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. 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. 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. 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. 61, which is incorporated by reference as specified in Sec. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. 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. 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. The width of Panel or 0.762 Meter which is Greater. If more than one dc cell line process power supply serves the same cell line, a disconnecting means shall be provided on the cell line circuit side of each power supply to disconnect it from the cell line circuit. 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. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Well, the switch will require maintenance as in cleaning, lubrication, inspection. Note that our enforcement guidance may be affected by changes to OSHA rules. 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. Your question has been restated below for clarity. Monitoring System (TPMS) Sensor Training in this section. No marks or blemishes on wheel faces. Resistance welders. The disconnecting means shall be operable from a location readily accessible from the X-ray control. 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. Electric equipment shall be installed in a neat and workmanlike manner. 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. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. Durability. 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. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. Induction heating coils shall be protected by insulation or refractory materials or both. Disconnecting means. Illumination shall be provided for all working spaces about electric equipment. 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