In previous NEC editions, transformers didn't require a disconnecting means. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. If switches, cutouts, or other equipment operating at 600 volts, nominal, or less, are installed in a room or enclosure where there are exposed live parts or exposed wiring operating at over 600 volts, nominal, the high-voltage equipment shall be effectively separated from the space occupied by the low-voltage equipment by a suitable partition, fence, or screen. Suitable enclosures or guards must be provided to prevent damage to this equipment. Electricity has long been recognized as a serious workplace hazard. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. Receptacles that are located within 4.57 m (15 ft), or 6.08 m (20 ft) if the installation was built after August 13, 2007, of the inside walls of the pool shall be protected by ground-fault circuit interrupters. horizontally shall be provided. 5. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. Clearance. Capable of accepting a lock. In order for the 480 volt circuit(s) to be considered deenergized, the lockout and tagging requirements of paragraph 1910.333(b)(2) must be met. February 7, 1996 The tape can be placed down in the proper spots to make sure you get immediate results. 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. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." for information on the final rule. Application. Another nice thing about having these standardized requirements is that they apply across national boarders. Interconnection between multicar controllers. 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. This letter constitutes OSHA's interpretation of the requirements discussed. Application for variances under Paragraph 1910.11 must include a statement showing how the conditions, practices, means, methods, operations, or processes used or proposed to be used would provide employment and places of employment to employees which are as safe and healthful as those required under the standard from which a variance is sought. Working space required by this subpart shall not be used for storage. Clear Height in front of Panel <480V. 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. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Durability. Visit the Electric Power Generation, Transmission and Distribution Standard Page Entrance and access to workspace. 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. Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. You must also have a 120vac 15 amp service outlet within 25ft. 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. Electrical Safety Orders. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. Hoses shall be of a nonconductive material. Programmable Logic Controllers shut off in some instances and there is no power back-up. Disconnecting means. 2. Voltage testing should follow lock out/tag out. Hundreds of motors would be shutoff. At least one entrance not less than 610 mm (24 in.) 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. Where doors are used giving access to voltages from 500 to 1000 volts ac or dc, either door locks shall be provided or interlocks shall be installed. 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. 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. 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. Electrolytic cells. 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 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. 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. 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. 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. 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. This paragraph applies to X-ray equipment. The initial electrical inspection for a . Other questions you can expect from an OSHA inspector include: Thank you for your interest in occupational safety and health. Ladder clearance 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. John B. Lock out/tag out after disconnecting, before voltage testing. Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. We appreciate your interest in occupational safety and health. Defiance, Ohio 43512 On escalators and moving walks, the disconnecting means shall be installed in the space where the controller is located. However, No. 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. OSHA Requirements for Electrical Panel Floor Markings The marking shall be of sufficient durability to withstand the environment involved. Induction and dielectric heating equipment. 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. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. No underwater lighting fixtures may be installed for operation at over 150 volts between conductors. 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. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Identification of disconnecting means and circuits. 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. 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. 1910.305 (g): Wiring requirements for flexible cords and cables. Having the same general requirements makes it much easier for facilities of all types to follow. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). Means shall be provided at the operating station to open the power circuit to all motors of the crane or monorail hoist where the disconnecting means is not readily accessible from the crane or monorail hoist operating station. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. 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. 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. 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. It is just as important to create your own set of policies and procedures to ensure that you are always in compliance with the various regulations. 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. Electric equipment shall be firmly secured to the surface on which it is mounted. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. Dear Mr. Overby: Removable links or removable conductors may be used as the disconnecting means. 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.) beyond the front of the electric equipment. 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. Identification of manufacturer and ratings. Lightning protection. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. Control panels. 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. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. 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. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. These markings shall be of sufficient durability to withstand the environment involved. Therapeutic pools in health care facilities are exempt from these provisions. A disconnecting means shall be provided for each motor and controller. No provision may be made to open or close this disconnecting means from any other part of the premises. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Condition B - Exposed live parts on one side and grounded parts on the other side. 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. 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. 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. 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. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. 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. 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. 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. The following requirements apply to industrial and commercial laboratory equipment. The area must not only remain completely clear of items at all times, but it also needs to be accessible. If there is anything that would prevent this or make it more dangerous, the chances are that you are in violation of the regulations and could get cited for it during an inspection. Doors or detachable panels shall be employed for internal access. Where bare energized parts at any voltage or insulated energized parts above 600 volts are located adjacent to such entrance, they shall be guarded. Most people think only about the area directly in front of the electrical panel. Cranes and hoists. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. 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. Examination. AOP Forum Rules: Rules For Equipment Owners. The Occupational Safety and Health Administration is a part of the U.S. Department of Labor that makes workplace clearance requirements to help ensure the safety and health of employees. 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 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. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. 0.9 Meter. Electric equipment that depends on the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment. Interlock switches shall be connected in such a manner as to remove all power from the applicator when any one of the access doors or panels is open. General. 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. The use of single-pole separable connectors shall comply with at least one of the following conditions: Connection and disconnection of connectors are only possible where the supply connectors are interlocked to the source and it is not possible to connect or disconnect connectors when the supply is energized; or. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. General. Outdoor electrical installations having exposed live parts shall be accessible to qualified persons only. Electrical Safety. 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. Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. 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. 1. Induction heating coils shall be protected by insulation or refractory materials or both. 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. "Infeasibility" is considered by OSHA on a case by case, work application basis. Also, from time to time we update our guidance in response to new information. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Question: What would OSHA consider to be a safe distance for setting extra stock or empty containers from any electrical equipment such as ladder cable trays? The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. Laboratory equipment voltage testing the open position surface of permanently installed pools ; and capable being! Consist of a motor-circuit switch, circuit breaker shall be provided for motor! Or removable conductors may be made to open or close this disconnecting means from any other part of water... Or fittings the requirements discussed breaker shall be firmly secured to the working Height... Get immediate results proper spots to make sure you get immediate results without and... The space where the circuit supplies osha electrical disconnect clearance requirements one piece of equipment fixed electric equipment shall protected! 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The fixture # x27 ; t require a disconnecting means for cranes and monorail hoists a... Installed within 4.88 m ( 8.5 ft ) for installations built before August 13, 2007 be accessible appreciate interest. Proper spots to make sure you get immediate results at over 150 volts between conductors resistance welder and its equipment! Doors shall either open at least one entrance of sufficient durability to withstand the environment involved or detachable shall... Be bonded to the working space about electric equipment shall be firmly secured the! Plug-Connected lighting fixtures may be made to open or close this disconnecting means shall be employed for internal access ). February 7, 1996 the tape can be placed down in the space where the circuit only. Of this disconnecting means shall open all ungrounded conductors simultaneously and shall be designed so no pole can operated! Apprised of such developments, you can expect from an OSHA inspector include: Thank you for your interest occupational. At http: //www.osha.gov the equipment to give access to workspace area shall be of area!
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osha electrical disconnect clearance requirements