The disconnecting means shall be capable of being locked in the open position. Suitability of equipment for an identified purpose may be evidenced by listing, labeling, or certification for that identified purpose. 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. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. 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. The minimum clear working space in front of electric equipment such as switchboards, control panels, switches, circuit breakers, motor controllers, relays, and similar equipment shall not be less than specified in Table K-2 unless otherwise specified in this subpart. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. All other receptacles on the property shall be located at least 3.05 m (10 ft) from the inside walls of a pool. General. Where the driving machine or the motor-generator set is located in a remote machinery space, a single means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. 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. Induction heating coils shall be protected by insulation or refractory materials or both. 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. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. Electrolytic cells. 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. Working space. They also Secondly, installation can be tricky if one switches from an electric unit to a hybrid gas water heater or vice versa because of the required retrofitting. 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. 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. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. 0.9 Meter (3 Ft) Clearance When Facing Other Electrical Panels <480V. On wheelchair lifts and stairway chair lifts, the disconnecting means shall be located within sight of the motor controller. Switchboards, panelboards, and distribution boards installed for the control of light and power circuits, and motor control centers shall be located in dedicated spaces and protected from damage. 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 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. Working space about electric equipment. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. The Ontario Electrical Safety Code ( OESC) deals in detail with permanent and temporary theatrical electrical installations. It is also easy to verify. 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. 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 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. If deenergizing the control circuit(s) is infeasible, paragraph 1910.333(c)(2) would apply to work on or near the 110 volt control circuit(s). Enclosure for electrical installations. Examination, installation, and use of equipment -. Identification of manufacturer and ratings. Motor controllers. Does it require maintenance while energized? 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. 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. 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. This letter constitutes OSHA's interpretation of the requirements discussed. Parts of electric equipment which in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. Overcurrent protection of electrolytic cell dc process power circuits need not comply with the requirements of 1910.304(f); Equipment located or used within the cell line working zone or associated with the cell line dc power circuits need not comply with the provisions of 1910.304(g); and. Grounding should be the last of these steps. 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. 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. 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. Carnivals, circuses, fairs, and similar events. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. The width of Panel or 0.762 Meter which is Greater. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Headroom. The disconnecting means shall be operable from a location readily accessible from the X-ray control. July 26, 2004 Conductors shall be spliced or joined with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy. 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. This is necessary because it is not practical to run dozens, or even hundreds, of different electrical lines directly into the main circuit. 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. Capable of accepting a lock. Electrical panels are an essential component in any facility. 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. Sincerely, wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. A disconnecting means shall be provided in the supply circuit. 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. 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. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. This set of code identifies how much clearance is needed around any type of electrical panel based on a number of different factors. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. They can also be mounted on some kind of support structure attached to the pump-motor assembly base. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. 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. 110-26 of the National Electrical Code (NEC): 1) at least a 3-ft clearance in front of all electrical equipment; 2) a 30 in.-wide working space in front of equipment operating at 600V or less; and 3) minimum headroom clearance of 6 ft or the height of the . 600 Volts, nominal, or less. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. This fault shall be assumed to be either between two or more of the circuit conductors, or between any circuit conductor and the grounding conductor or enclosing metal raceway. Installations accessible to qualified persons only. OSHA requirements are set by statute, standards and regulations. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. If anything is found in a spot that is too close to the panel, the items can be moved right away. Workspace about equipment. The work space shall be clear and extend from the grade, floor, or platform to the height required by paragraph (g)(1)(vi) of this section. 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). 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. Here's a broad breakdown of space requirements when planning around electrical panels: Location. Walls constructed of concrete, brick, or tile are considered to be grounded. All electrical conductors and equipment shall be approved. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. High-Voltage Electrical Safety Orders (Sections 2700 - 2989) The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: The disconnecting means shall be a listed device. John B. Following the 110.26 NEC standards is fairly easy. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. Portable distribution and termination boxes. Marking. 2.0 Meter. Cord connectors may not be laid on the ground unless listed for wet locations. horizontally shall be provided. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. ), whichever is greater. Access and entrance to working space. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Group 1. Maximum Number of Disconnects (i.e. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. The tape can be placed down in the proper spots to make sure you get immediate results. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. 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. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Approval. These are generic codes which may not apply to all vehicles and we recommend you . Hundreds of motors would be shutoff. If the voltage is higher than 50kV, the clearance shall be increased 4 in. Hoses shall be of a nonconductive material. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. No fixed work platform has been provided for servicing the unit. Driving machines 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 adjacent to the equipment in order to prevent starting. Each sign and outline lighting system, or feeder circuit or branch circuit supplying a sign or outline lighting system, shall be controlled by an externally operable switch or circuit breaker that will open all ungrounded conductors. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. Safety electrical work practices; motor disconnects;work clearances. Application. A disconnecting means shall be provided between the runway contact conductors and the power supply. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. While OSHA is only followed in the United States, NFPA is a non-governmental organization. Durability of markings. Disconnecting means. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." Cranes and hoists. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] Wiring for an amusement ride, attraction, tent, or similar structure may not be supported by another ride or structure unless specifically identified for the purpose. Note that our enforcement guidance may be affected by changes to OSHA rules. Programmable Logic Controllers shut off in some instances and there is no power back-up. Operation. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant. 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 dielectric breakdown level is further influenced by relative humidity, temperature, and degree of pollution in the environment. 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. The following requirements apply to industrial and commercial laboratory equipment. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided; Heating effects under all conditions of use; Classification by type, size, voltage, current capacity, and specific use; and. Cables and mats shall be arranged so as not to present a tripping hazard. 3. Exposed live parts on one side and grounded parts on the other side. Warning sign for multiple disconnecting means. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. . 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. 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. See if you can "orient" the disconnect so as to have requisite clearance in front. Terminals for more than one conductor and terminals used to connect aluminum shall be so identified. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? Exception. No architectural appurtenance or other equipment may be located in the working space required by paragraph (g)(1)(i) of this section. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. It is not an official legal edition of the CFR. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 600 Volts, nominal, or less. Equipment intended to break current shall have an interrupting rating at system voltage sufficient for the current that must be interrupted. Placed within view of the runway contact conductors. Electrically driven or controlled irrigation machines -. The Electrical Safety Authority ( ESA) was established in 1999 . Motor controllers may be located outside the spaces otherwise required by paragraph (c) of this section, provided they are in enclosures with doors or removable panels capable of being locked closed and the disconnecting means is located adjacent to or is an integral part of the motor controller. 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. If the disconnect for a piece of HVAC equipment doesn't have any fuses, then can you make the argument the switch will not require maintenance so that 3' clearance isn't required? Your scenario and questions, and our replies, follow. Interrupting rating. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. The area must not only remain completely clear of items at all times, but it also needs to be accessible. 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. Enclosure, 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. OSHA Requirements for Electrical Panel Floor Markings Electrolytic cells, cell line conductors, cell line attachments, and the wiring of auxiliary equipment and devices within the cell line working zone need not comply with the provisions of 1910.303 or 1910.304(b) and (c). Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. 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. The supply circuit switch may be used as the welder disconnecting means where the circuit supplies only one welder. 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. 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. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. Electric equipment shall be installed in a neat and workmanlike manner. Electric equipment shall be firmly secured to the surface on which it is mounted. Examination. 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. If fixed electric equipment is mounted on an energized conductive surface, it shall be bonded to that surface. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. 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. 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. Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone. According to the National Electric Code, any electrical panel with 0 to 150 volts should have 36 inches of clearance around it for both the person working on it and their tools. 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. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. Space about electric equipment. Clear Height in front of Panel <480V. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. Identification of disconnecting means and circuits. 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. Panels with 151 to 600 volts should have 42 of clearance around it. Visit the Electric Power Generation, Transmission and Distribution Standard Page 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. In addition to the dimensions shown in Table K-1, workspace shall not be less than 30 inches (762 mm) wide in front of the electric equipment. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. A simple way to meet electrical panel clearance requirements is to use floor markings. Once again, however, the NFPA 70e electrical panel clearance requirements will match those of the NEC and of OSHA. Hot glue machines would be shutdown and the glue would set. Where the driving machine is located in a remote machinery space, a single disconnecting means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. Also, from time to time we update our guidance in response to new information. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. Directorate of Enforcement Programs Preventing Obstructions Around Electrical Panels, NEC 110.26 specifies is that all electrical panels, the NFPA 70e electrical panel clearance requirements, Floor Marking for Electrical Panel Compliance, Occupational Safety and Health Administration (OSHA). 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.
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