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. Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, may not be damaged or contaminated by foreign materials such as paint, plaster, cleaners, abrasives, or corrosive residues. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. Induction heating coils shall be protected by insulation or refractory materials or both. AOP Forum Rules: Rules For Equipment Owners. In addition, from time to time we update our guidance in response to new information. Here's a broad breakdown of space requirements when planning around electrical panels: The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. Interrupting rating. Hot glue machines would be shutdown and the glue would set. Dear Mr. Schuldt: They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Lighting fixtures, lighting outlets, and ceiling suspended (paddle) fans. Where a pool is installed permanently at a dwelling unit, at least one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit shall be located a minimum of 3.05 m (10 ft) and not more than 6.08 m (20 ft) from the inside wall of the pool. Disconnecting means. 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. 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. One of the main things that the NEC 110.26 specifies is that all electrical panels must have enough room around them that someone working on the equipment will have the room to safely access everything they need. If deenergizing the control circuit(s) is infeasible, paragraph 1910.333(c)(2) would apply to work on or near the 110 volt control circuit(s). 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. Insulation integrity. Exposed live parts on one side and grounded parts on the other side. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Monitoring System (TPMS) Sensor Training in this section. General. Identification of disconnecting means and circuits. High-Voltage Electrical Safety Orders (Sections 2700 - 2989) Examination, installation, and use of equipment -. 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. Your question has been restated below for clarity. Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by cabinets or other forms of enclosures, or by any of the following means: By location in a room, vault, or similar enclosure that is accessible only to qualified persons. 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. At least one entrance not less than 610 mm (24 in.) 8. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. You're not if you fail to comply with the following three clearance requirements in Sec. 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. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. 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. Protection of electric equipment. A means shall be provided to disconnect power to all electronic equipment in an information technology equipment room. We hope you find this information helpful. 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. 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. (150 mm) This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. 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? 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. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. On elevators with generator field control, the disconnecting means shall be located within sight of the motor controller for the driving motor of the motor-generator set. 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. Receptacles on circuits supplied by an isolating transformer with an ungrounded secondary: May not be used in any other location in the 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. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. 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. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. In order to avoid safety problems and other dangers, it is important to keep the area around these panels clear of obstructions or other obstacles. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. Other questions you can expect from an OSHA inspector include: 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. 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. 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. 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. Working space required by this standard may not be used for storage. Single-car and multicar installations. . Grounding should be the last of these steps. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. 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. 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. The specific electrical panel clearance requirements will depend on what area you are looking at, and how much voltage there is going through the panel. 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. Clearance. A simple way to meet electrical panel clearance requirements is to use floor markings. U0xxx - Generic. 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. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." July 26, 2004 Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Even if they know how much room in inches is required, they may not be able to properly estimate how much room they are leaving when placing items in the area. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Electrolytic cells. horizontally shall be provided. This paragraph applies to X-ray equipment. This exception was put in to correspond to 430.107 that requires at least one of the disconnecting means required for a motor and motor controller to be readily accessible. Taking the time to make sure that nothing is in these areas will help to avoid any type of penalties that may be issued if you are inspected by OSHA or other agencies. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. Permanent ladders or stairways shall be provided to give safe access to the working space around electric equipment installed on platforms, balconies, mezzanine floors, or in attic or roof rooms or spaces. Installations accessible to unqualified persons. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. 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. Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. If fixed electric equipment is mounted on an energized conductive surface, it shall be bonded to that surface. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. We appreciate your interest in occupational safety and health. 6. Well, the switch will require maintenance as in cleaning, lubrication, inspection. 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. Any openings in such partitions or screens shall be so sized and located that persons are not likely to come into accidental contact with the live parts or to bring conducting objects into contact with them. 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. 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. 508 Carpenter Road 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]. On a regular basis, they should go out and inspect the areas around them to make sure nothing has been placed where it should not go. 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. 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. Arcing parts. 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. 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. 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. Dayton, Ohio 45420 7. All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. 61, which is incorporated by reference as specified in Sec. 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. This is necessary for all types of work including examination of the electrical panel, making adjustments to the electrical panel, servicing the electrical panel, and of course, performing maintenance on the electrical panel. Sufficient access and working space shall be provided and maintained about all electric equipment to permit ready and safe operation and maintenance of such equipment. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). 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. 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