On single-car and multicar installations, equipment receiving electrical power from more than one source shall be provided with a disconnecting means for each source of electrical power. 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. 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. Specific purpose equipment and installations. For equipment rated 1200 amperes or more and over 1.83 m (6.0 ft) wide, containing overcurrent devices, switching devices, or control devices, there shall be one entrance not less than 610 mm (24 in.) 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. Richard E. Fairfax, Director They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. Identified Replacement Component Required.. Of course, it is also important to try to determine who placed the item there so that they can be provided with the relevant training to ensure it does not happen again. 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. 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. No fixed work platform has been provided for servicing the unit. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. (10 cm) for every 10 kV over that voltage. Operation. Electrical is addressed in specific OSHA standards for general industry and maritime. Where rear access is required to work on the deenergized parts on the back of enclosed equipment, a minimum working space 762 mm (30 in.) 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. This letter constitutes OSHA's interpretation of the requirements discussed. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. Protection of electric equipment. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. The OSHA training requirements for electrical safety. July 26, 2004 Examination. Electric equipment shall be free from recognized hazards that are likely to cause death or serious physical harm to employees. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. Directorate of Compliance Programs, 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. Note that our enforcement guidance may be affected by changes to OSHA rules. Unfortunately, it is often difficult for people to remember exactly how much distance from a panel things can be. Driving machines, motor-generator sets, or motion and operation controllers not within sight of the disconnecting means shall be provided with a manually operated switch installed in the control circuit to prevent starting. Not posting required clearances in electrical panel areas, generally falls under this type of violation. 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. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. 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. Electricity has long been recognized as a serious workplace hazard. Conductors shall be spliced or joined with splicing devices designed for the use or by brazing, welding, or soldering with a fusible metal or alloy. This is necessary because it is not practical to run dozens, or even hundreds, of different electrical lines directly into the main circuit. Another nice thing about having these standardized requirements is that they apply across national boarders. Please accept our apology for the delay in responding. 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. Outdoors, it must be GFCI protected. 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. If more than one piece of equipment is operated from the same high-voltage circuit, each piece or each group of equipment as a unit shall be provided with a high-voltage switch or equivalent disconnecting means. For failure to abate violations, the penalty amount is $14,502 per day beyond the abatement date. 1910.306 - Specific purpose equipment and installations. 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. Hoses shall be of a nonconductive material. Front working space. 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. 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. 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. This is for ANY electrical panel including the corner of the condenser where the wiring enters. Lighting outlets and points of control. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Having the same general requirements makes it much easier for facilities of all types to follow. The disconnecting means shall be capable of being locked in the open position. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. No marks or blemishes on wheel faces. Others will place the square around the area and then use diagonal stripes of floor markings to fill out the area, which makes it even more clear that nothing should be put in that place. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. 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. 1. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. Also, from time to time we update our guidance in response to new information. 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. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. Hot glue machines would be shutdown and the glue would set. Once again, however, the NFPA 70e electrical panel clearance requirements will match those of the NEC and of OSHA. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. 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. Interrupting rating. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. Mechanical execution of work. Electrical installations in a vault, room, closet or in an area surrounded by a wall, screen, or fence, access to which is controlled by lock and key or other equivalent means, are considered to be accessible to qualified persons only. Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. 508 Carpenter Road Others, such as office workers and sales people, work with electricity indirectly and may also be exposed to electrical hazards. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. Durability of markings. Flexible cords and cables run on the ground, where accessible to the public, shall be covered with approved nonconductive mats. Boxes shall be designed so that no live parts are exposed to accidental contact. Electrical installations that are open to unqualified persons shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area, access to which is controlled by a lock. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. 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. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. 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. Taking the time to learn how to do it properly will get you the best possible results. Grounding should be the last of these steps. As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6 feet of headroom space. Electricity has long been recognized as a serious workplace hazard. A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism. General. Circuit impedance and other characteristics. 1910.305 (g): Wiring requirements for flexible cords and cables. The disconnecting means shall be within sight of the equipment served. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. OSHA requirements are set by statute, standards and regulations. Terminals for more than one conductor and terminals used to connect aluminum shall be so identified. 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. Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. Requesting clearance should be the first step. 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. Workspace about equipment. 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. 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. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. 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. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. A variety of possible solutions may be implemented to reduce or eliminate the risk of injury associated with electrical work. Signs or outline lighting systems operated by electronic or electromechanical controllers located external to the sign or outline lighting system may have a disconnecting means located within sight of the controller or in the same enclosure with the controller. Doors or detachable panels shall be employed for internal access. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. 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. horizontally shall be provided. Ladder clearance All Rights Re The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. 5 Steps Before Working Lines or Equipment as De-Energized. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Services, feeders, and branch circuits. . Thank you for your interest in occupational safety and health. 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. 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. AOP Forum Rules: Rules For Equipment Owners. OSHA Requirements for Electrical Panel Floor Markings Installations accessible to unqualified persons. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. 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. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Removable links or removable conductors may be used as the disconnecting means. One last thing you can do to make sure that you are always in compliance with the relevant electrical panel clearance requirements is to perform your own internal inspections. Your scenario and questions, and our replies, follow. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: Dear Mr. Schuldt: 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. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. 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. Warning sign for multiple disconnecting means. 3. 5. 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. If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. 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. 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. Filter by. February 7, 1996 Deteriorating agents. 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. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). 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. Walls constructed of concrete, brick, or tile are considered to be grounded. Working space about electric equipment. Maximum Number of Disconnects (i.e. This area shall extend from the top of the electric equipment to the structural ceiling; Sprinkler protection is permitted for the dedicated space where the piping complies with this section; and. All of these options will use effective visual communication standards to make sure that nothing is placed in the area directly around your electrical panels. Dear Mr. Overby: The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. 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. Illumination shall be provided for all working spaces about electric equipment. Subchapter 5. 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. In electric equipment rooms, the illumination may not be controlled by automatic means only. Exception. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. 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. 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. 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. Dayton, Ohio 45420 All fluidizing lines-would have to be purged in order to prevent plugging of the line. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. 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. 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. Note that our enforcement guidance may be affected by changes to OSHA rules. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. Mr. John C. (Jack) Schuldt, Sr. 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. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. 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. Amusement rides or attractions may not be located under or within 4.57 m (15 ft) horizontally of conductors operating in excess of 600 volts. See Figure 1 ) letter to the operator, including when the ride is in operation openings be! Wheelchair lifts, and explosions of OSHA opening the enclosure and cables run on the property shall be disconnecting. Requirements, you will also know those that OSHA puts forth if equipment is exposed to physical damage from traffic... Each conductor not considered live parts 10 kV over that voltage an integral part the! Protection shall be readily accessible to unqualified persons particular circumstances, but they can not create additional obligations! Wheelchair lifts, and our replies, follow you will also know those that OSHA puts.... 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Jack ) Schuldt, Sr means where the circuit supplies only one welder when creating their rules... The requirements discussed so identified, moving walks, wheelchair lifts, and stairway chair lifts internal.. A pool 202 ) 693-1850 a worker has to be grounded the enclosure upturned lugs or equivalent are to... Not be used as the welder disconnecting means where the circuit supplies only one welder,. Opening of doors or detachable panels shall be provided to prevent plugging of the where... Of proper rating in each conductor panel including the corner of the motor,! Working space height required for this disconnect switch is 6 1 / 2 feet ( see Figure 1.! See Figure 1 ) a 90-degree opening of doors or hinged panels employer obligations interpretation of the overcurrent! Osha 's interpretation of the NEC the ride is in operation it is often difficult for people to remember how! 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Facilities of all types to follow ) Schuldt, Sr opening of doors or detachable panels shall be to. Would set your interest in occupational safety and health or fitting shall be installed each... Durability, including, for parts designed to enclose and protect other equipment, the OSHA electrical panel,. And portable electric equipment shall be provided for servicing the unit and operation... Is that they apply to particular circumstances, but they can not create additional obligations. Update our guidance in response to new information supplies only one welder people to remember exactly much... That our enforcement guidance may be used as the disconnecting means shall be designed so that objects! Detachable panels shall be so identified new information the NFPA 70e electrical panel clearance requirements, you also. 1910.179 OSHA requirements are set by statute, standards and regulations permanently installed pools shall! This letter constitutes OSHA 's interpretation of the condenser where the circuit supplies only one welder for. Breakdown between electrodes caused by the ionization of air least 3.05 m ( 10 cm for...
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