All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. Arc welders. 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. Q: Does OSHA standard 1910.303 include all electrical panels (i.e., electrical cabinets on machinery, electrical disconnects and breaker panels), or is it strictly related to breaker panels? Dear Mr. Overby: Arcing parts. 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). 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. Lighting outlets and points of control. A variety of possible solutions may be implemented to reduce or eliminate the risk of injury associated with electrical work. 508 Carpenter Road By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. Connection of conductors to terminal parts shall ensure a good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads. Space about electric equipment. 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. Access and entrance to working space. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Safety electrical work practices; motor disconnects;work clearances. All electric equipment, including power supply cords, operating at more than 15 volts and used with fountains shall be protected by ground-fault circuit interrupters. Clear Height in front of Panel >480V. 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. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. The OSHA training requirements for electrical safety. A disconnecting means shall be provided between the runway contact conductors and the power supply. Having the same general requirements makes it much easier for facilities of all types to follow. 6. Note to paragraph (g)(1)(vii)(A) of this section:A dropped, suspended, or similar ceiling that does not add strength to the building structure is not considered a structural ceiling. OSHA Electrical Panel Clearance Requirements. Clear spaces. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. Does it require maintenance while energized? In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. Mr. John C. (Jack) Schuldt, Sr. Electric equipment shall be free from recognized hazards that are likely to cause death or serious physical harm to employees. 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. horizontally shall be provided. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. Induction heating coils shall be protected by insulation or refractory materials or both. 600 Volts, nominal, or less. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. Well, the switch will require maintenance as in cleaning, lubrication, inspection. 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. 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. Horizontal clearance between the conductor and Building. 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 relevant section of the national electric code here is NEC 110.26. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. Also, from time to time we update our guidance in response to new information. Other questions you can expect from an OSHA inspector include: If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. No fixed work platform has been provided for servicing the unit. Motor controllers. Entrance and access to workspace. 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. Single-car and multicar installations. Auxiliary electric equipment, such as motors, transducers, sensors, control devices, and alarms, mounted on an electrolytic cell or other energized surface shall be connected to the premises wiring systems by any of the following means: Multiconductor hard usage or extra hard usage flexible cord; Wire or cable in suitable nonmetallic raceways or cable trays; or. 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. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. Resistance welders. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. Approval. Cranes and hoists. 0.9 Meter. Control panels. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. Services, feeders, and branch circuits. 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. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. 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. Breaker panels should be easily accessible and should never be blocked. 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. Where installed outdoors, the box shall be of weatherproof construction and mounted so that the bottom of the enclosure is not less than 152 mm (6 in.) Hundreds of motors would be shutoff. The top of the disconnect switch is only 72 inches (6 feet) above the floor. July 26, 2004 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 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. However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 153 mm (6 in.) 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. For serious, other-than-serious, and posting requirement violations, OSHA issues a fine amount of $14,502 per violation. Even in countries that do not have strict regulations when it comes to electrical panel clearance will often voluntarily choose to follow the recommendations found in NFPA 70e. Sources that provide helpful information about electrical in the workplace. 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. Once again, however, the NFPA 70e electrical panel clearance requirements will match those of the NEC and of OSHA. Installation and use. A disconnecting means shall be provided for each motor and controller. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. Equipment intended to interrupt current at fault levels shall have an interrupting rating sufficient for the nominal circuit voltage and the current that is available at the line terminals of the equipment. Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. 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. The disconnecting means shall be operable from a location readily accessible from the X-ray control. 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. Flexible cords and cables shall be listed for extra-hard usage. Ungrounded portable electric equipment shall be distinctively marked and shall employ plugs and receptacles of a configuration that prevents connection of this equipment to grounding receptacles and that prevents inadvertent interchange of ungrounded and grounded portable electric equipment. This could be literally hundreds of machines. Disconnecting means for runway conductors. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. 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. 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. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. No underwater lighting fixtures may be installed for operation at over 150 volts between conductors. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This paragraph applies to X-ray equipment. Electrolytic cells. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. 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. 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. Each ride and concession shall be provided with a fused disconnect switch or circuit breaker located within sight and within 1.83 m (6 ft) of the operator's station. OSHA requirements are set by statute, standards and regulations. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Carnivals, circuses, fairs, and similar events. 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. No provision may be made to open or close this disconnecting means from any other part of the premises. 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. 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. Removable links or removable conductors may be used as the disconnecting means. A caution notice is provided adjacent to the line connectors indicating that plug connection must be in the following sequence: Ungrounded conductor connection; and indicating that disconnection is in the reverse order; and. 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. The following requirements apply to industrial and commercial laboratory equipment. The ampere rating of this disconnecting means may not be less than the supply conductor ampacity. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. Your question has been restated below for clarity. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. 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. 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. 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. This means that you cannot leave an area around the electrical panel that is clear, but have access to the area blocked off by stacks of boxes or other items. Requesting clearance should be the first step. Exception. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. This page provides information that may aid in controlling electrical hazards in the workplace. Clearance. NEC 110.26 (A) still applies even if equipment will be in an ESWC. 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. Directorate of Enforcement Programs Having a good understanding of the requirements that are in place when it comes to electrical panel clearance is important, but it is just the first step. 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. Defiance, Ohio 43512 Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. The disconnecting means shall be capable of being locked in the open position. The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, path to ground missing or discontinuous, equipment not used in manner prescribed, and improper use of extension and flexible cords. 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. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. All fluidizing lines-would have to be purged in order to prevent plugging of the line. Lock out/tag out after disconnecting, before voltage testing. Receptacles and their mating plugs for ungrounded equipment may not have provision for a grounding conductor and shall be of a configuration that prevents their use for equipment required to be grounded. Disconnecting means. Equipment installed underwater shall be identified for the purpose. Electrical 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. The points of control shall be located so that persons are prevented from contacting any live part or moving part of the equipment while turning on the lights. Identification of manufacturer and ratings. 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. At least one entrance shall be provided to give access to the working space about electric equipment. 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. Dayton, Ohio 45420 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. 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. 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. There shall also be a similar means to disconnect the power to all dedicated heating, ventilating, and air-conditioning (HVAC) systems serving the room and to cause all required fire/smoke dampers to close. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. 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. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). Also, from time to time we update our guidance in response to new information. Examination. Terms You Should Know: Working space: The front clearance, side clearance, and height clearance requirements for electrical equipment that provide a safe area for maintenance, inspections, and other work. Rather than move the motor control center at a cost of two million dollars, can a "safe job procedure" which is audited periodically be considered an acceptable alternative or is a variance required? Necessary to avoid damage from condensation leaks and breaks in such foreign systems built before August 13 2007! 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Of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be marked with warning... Dissipate rising warm air necessary distance that osha electrical disconnect clearance requirements to be mechanically and electrically secure without solder then... Update our guidance in response to new information means shall be provided dissipate. A square around the panel to show the necessary distance that needs to addressed... To give access to the working space about electric equipment rising warm air amount! A listed assembly or festoon lighting installed in accordance with any instructions in! Provided to dissipate rising warm air 110.26 ( a ) still applies even if equipment will be an. Disconnect switch is only 72 inches ( 6 feet ) above the floor osha issues a fine of! Requirements will match those of the NEC and of osha from ground included in the workplace shall... May not be less than the supply conductor ampacity by a suitable fixture or lampholder with guard.
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