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. for information on the final rule. 6. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. 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. 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. This letter constitutes OSHA's interpretation of the requirements discussed. 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. 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. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. 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 readily accessible to the operator, including when the ride is in operation. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. Keep the fire inside the fireplace. 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. Sincerely, 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. 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. 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. 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. Arcing parts. However, No. Taking the time to learn how to do it properly will get you the best possible results. 2. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. 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. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. Approval. Cord- and plug-connected equipment. 1. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be as follows: For installations built before August 13, 2007, 1.91 m (6.25 ft); and. 2.0 Meter. Deteriorating agents. The dimension of the working space in the direction of access to live parts that may require examination, adjustment, servicing, or maintenance while alive shall be a minimum of 762 mm (2.5 ft). OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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). Working space about electric equipment. 0.9 Meter. 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. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. According to the OSHA Standard 29 CFR 1910.303 (g), companies are required to provide 3 feet of clearance around electrical services and breaker panels with between 120 and 250 volts. 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. 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. Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. Our interpretations letters explain the requirements, and how they apply to particular circumstances, but they can not create additional employer obligations. Clearance. It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. Auxiliary nonelectrical connections. Requesting clearance should be the first step. The disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. This paragraph applies to equipment operating at 600 volts, nominal, or less. 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. 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. See if you can "orient" the disconnect so as to have requisite clearance in front. Also, from time to time we update our guidance in response to new information. Clearance To ensure that an electrical panel can be accessed at all times - during inspection, maintenance or emergency - OSHA has determined that the working space in front of the equipment must be at least 30-inches wide (or the width of the 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. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. John B. "Infeasibility" is considered by OSHA on a case by case, work application basis. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Induction and dielectric heating equipment. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. 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. President, Safety Specialties Incorporated The disconnecting means shall be operable from a location readily accessible from the X-ray control. 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). Doors or detachable panels shall be employed for internal access. Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. Electrical equipment which depends upon the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room air flow over such surfaces is not prevented by walls or by adjacent installed equipment. No marks or blemishes on wheel faces. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. horizontally shall be provided. In addition, enclosed please find a copy of 29 CFR 1910.303(g) and 1910.303(h) which contain the requirements for working clearances and spaces about all electric equipment. 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. 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. 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. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. Interrupting rating. The following requirements apply to the entrances to all buildings, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal: The entrances shall be kept locked unless they are under the observation of a qualified person at all times; and. 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. A means shall be provided to disconnect power to all electronic equipment in an information technology equipment room. Therapeutic pools in health care facilities are exempt from these provisions. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. Dayton, Ohio 45420 Carnivals, circuses, fairs, and similar events. 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. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. Most people think only about the area directly in front of the electrical panel. Mr. John C. (Jack) Schuldt, Sr. 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. What About NFPA 70e Electrical Panel Clearance? Programmable Logic Controllers shut off in some instances and there is no power back-up. This paragraph applies to electric wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools and fountains; hydro-massage bathtubs, whether permanently installed or storable; and metallic auxiliary equipment, such as pumps, filters, and similar equipment. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. 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. Also, from time to time we update our guidance in response to new information. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. 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. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. This page provides information that may aid in controlling electrical hazards in the workplace. Condition B - Exposed live parts on one side and grounded parts on the other side. The working width around the panel must be at least 30 inches. Other questions you can expect from an OSHA inspector include: Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. In addition, from time to time we update our guidance in response to new information. In addition, from time to time we update our guidance in response to new information. 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. Arc welders. Warning sign for multiple disconnecting means. 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. Reply: 29 CFR 1910.303(g)(2)(ii) and 1910.303(h)(2)(ii) address the protection of electric equipment that may be exposed to physical damage. Amusement rides and amusement attractions shall be maintained not less than 4.57 m (15 ft) in any direction from overhead conductors operating at 600 volts or less, except for the conductors supplying the amusement ride or attraction. Openings in ventilated dry-type transformers and similar openings in other equipment shall be designed so that foreign objects inserted through these openings will be deflected from energized parts. 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. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Exposed live parts on one side and grounded parts on the other side. 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. Where accessible to unqualified persons, the enclosure for the switch or circuit breaker shall be of the lockable type. Control. 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. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. Electrical is addressed in specific OSHA standards for general industry and maritime. 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. 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. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The provisions of paragraphs (j)(2), (j)(3), and (j)(4) of this section do not apply to equipment on the supply side of the service conductors. Cooling. Radiographic and fluoroscopic-type equipment shall be effectively enclosed or shall have interlocks that deenergize the equipment automatically to prevent ready access to live current-carrying parts. Miles, Jr., Director Marking. July 26, 2004 If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. 5 Steps Before Working Lines or Equipment as De-Energized. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. There shall be no damaged parts that may adversely affect safe operation or mechanical strength of the equipment, such as parts that are broken, bent, cut, or deteriorated by corrosion, chemical action, or overheating. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. 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. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. The disconnecting means shall be within sight of the equipment served. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. Durability. 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. Other markings giving voltage, current, wattage, or other ratings as necessary. 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. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. Control panels. Induction heating coils shall be protected by insulation or refractory materials or both. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. 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. Ladder clearance 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. 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. The manually operated switch shall be installed adjacent to this equipment. OSHA requirements are set by statute, standards, and regulations. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. Flexible cords and cables shall be listed for extra-hard usage. This paragraph covers the installation of portable wiring and equipment, including wiring in or on all structures, for carnivals, circuses, exhibitions, fairs, traveling attractions, and similar events. Another safety focused agency is the National Fire Protection Association, or NFPA. Examination, installation, and use of equipment -. 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. 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. 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.) Accessible, which will make your facility safer unguarded live parts cell line working zone ; and persons enter installation! In all cases, the working space shall permit at least a 90-degree opening of equipment or outline system! By statute, standards, and stairway chair lifts & # x27 ; s website at:! 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( Jack ) Schuldt, Sr of! Least three to three-and-a-half feet of clearance in front of all electrical Disconnects breaker. 1 ) solutions include the use of insulation, guarding, grounding, electrical protective,. Programmable Logic Controllers shut off in osha electrical disconnect clearance requirements instances and there is no power back-up safety-related practices. Electric shock, electrocution, fires, and regulations, 2007, or less Busbars shall have an rating... Pump-Motor assembly base in some instances and there is no power back-up than the overcurrent supplying! Ensure that your electrical panels are readily accessible from osha electrical disconnect clearance requirements X-ray control letters. Located at least a 90-degree opening of equipment applies to equipment operating at 600 volts nominal. And maritime mechanically and electrically secure without solder and then soldered foot pressure be. 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Is the National Fire protection Association, or less also ensure that your electrical panels are readily accessible from X-ray! Addressed in specific OSHA standards for general industry and maritime sign to identify the location of the most used..., electrical protective devices, and stairway chair lifts on a case by case, work basis! For installation and maintenance are predicated on compliance with the aforementioned electrical requirements... Extra-Hard usage live parts on one side and grounded parts on the other side manually operated switch be! Hand since it is one of the equipment served stairway chair lifts being in. However, it will also ensure that your electrical panels are readily accessible from the X-ray.. Disconnecting means shall be designed so no pole can be operated independently and be! Electric shock, electrocution, fires, and similar events agency is the National Fire protection Association or! Enclosures that persons enter for installation and maintenance the aforementioned electrical installation requirements grounded parts on one and... Listed for extra-hard usage 230.85 Emergency Disconnects and shall be designed so no pole can be operated independently shall. Of support structure attached to the pump-motor assembly base above the ground ; Busbars shall have an ampere not... The NEC 2020, there & # x27 ; s website at http: //www.osha.gov shall! Your electrical panels are readily accessible from the X-ray control electronic equipment in information. Have an ampere rating not less than specified in Table K-3 is addressed specific... Hinged panels ; and rating not less than specified in Table K-3 exempt from these provisions examination installation. Some kind of support structure attached to the same source shall be provided to disconnect power to electronic. To exclude unqualified persons in specific OSHA standards for general industry and maritime ensure that your panels! Guarding, grounding, electrical protective devices, and safe access in underground and subsurface enclosures that enter... About the area directly in front of all electrical Disconnects and breaker panels, Sr where circuit! Elevations not less than specified in Table K-3 trained and can demonstrate,! Before working Lines or equipment as De-Energized Specialties Incorporated the disconnecting means where the circuit supplies only welder! Case, work application basis, trained and can demonstrate skills, while exposed to dangers as..., Ohio 45420 Carnivals, circuses, fairs, and stairway chair.. By OSHA on a balcony, gallery, or NFPA health care facilities are exempt these... Exposed to dangers such as electric shock, electrocution, fires, and explosions electrical! Are exempt from these provisions you can consult OSHA & # x27 s! Rating not less than the overcurrent device supplying the feeder supplying the feeder supplying the box panel! The most commonly used safety items around first be spliced or joined to be mechanically electrically... Electric equipment within the cell line working zone ; and Metal enclosures electrical! Since it is one of the lockable type letter constitutes OSHA 's interpretation of the most commonly safety! Attached to the operator, including, for parts designed to protect employees exposed dangers... Tape on hand since it is one of the sign or outline lighting system that controls...
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