Monitoring System (TPMS) Sensor Training in this section. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. 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? 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 information on the final rule. The relevant section of the national electric code here is NEC 110.26. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. 5 Steps Before Working Lines or Equipment as De-Energized. The overcurrent protective devices, the total impedance, the component short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without the occurrence of extensive damage to the electrical components of the circuit. 3. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. More importantly, however, it will also ensure that your electrical panels are readily accessible, which will make your facility safer. 5. Identification of manufacturer and ratings. Electrical installations having exposed live parts shall be accessible to qualified persons only and shall comply with the applicable provisions of paragraph (j)(3) of this section. 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). Portable distribution and termination boxes. 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. Approval. By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. The frames and enclosures of portable electric equipment used within the cell line working zone may not be grounded, unless the cell line circuit voltage does not exceed 200 volts DC or the frames are guarded. Measuring off the required distance around the electrical panels and putting down floor markings will make it extremely easy to see exactly where things can and cannot be placed. Protection of electric equipment. 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. 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. Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. Except as required or permitted elsewhere in this subpart, live parts of electric equipment operating at 50 volts or more shall be guarded against accidental contact by cabinets or other forms of enclosures, or by any of the following means: By location in a room, vault, or similar enclosure that is accessible only to qualified persons. Mounting. Footnote(1) Conditions (a), (b), and (c) are as follows: Exposed live parts on both sides of the workspace [not guarded as provided in Condition (a)] with the operator between. Carnivals, circuses, fairs, and similar events. Cord connectors may not be laid on the ground unless listed for wet locations. Mechanical execution of work. Electrical Safety Orders. 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. On elevators without generator field control, the disconnecting means shall be located within sight of the motor controller. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. Workspace about equipment. 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. This letter constitutes OSHA's interpretation of the requirements discussed. 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. A disconnecting means shall be provided for each motor and controller. Working space required by this subpart shall not be used for storage. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. Here's a broad breakdown of space requirements when planning around electrical panels: Grounding should be the last of these steps. 600 Volts, nominal, or less. Sincerely, 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. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Disconnecting Means. Where one entrance to the working space is permitted under the conditions described in paragraph (h)(4)(i)(A) of this section, the entrance shall be located so that the edge of the entrance nearest the switchboards and control panels is at least the minimum clear distance given in Table S-2 away from such equipment. Working space. 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. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. 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. To put it simply, you must have a policy in place that will ensure that any electrical panel in your facility can be easily accessed and worked on at all times. The OSHA training requirements for electrical safety. This is why OSHA has put a requirement that all electrical panels have a minimum of three feet (36 inches) of room from the front of the panel to the nearest obstacle . Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. The points of control shall be so located that persons are not likely to come in contact with any live part or moving part of the equipment while turning on the lights. 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. It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. Well, the switch will require maintenance as in cleaning, lubrication, inspection. If anything is found in a spot that is too close to the panel, the items can be moved right away. . If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Group 1. Circuit impedance and other characteristics. 2 or larger. On switchboard and control panels exceeding 48 inches (1.22 m) in width, there shall be one entrance at each end of such board where practicable. 4. 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. 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. General. 2.0 Meter. Examination. Disconnecting means. Fire exit routes cannot be obstructed [29 CFR 1910.37 (a) (3)] and they cannot become more narrow at any point. 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. 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. Minimum clearance of 3 inches overhead and 2 inches laterally shall be provided and maintained between crane and obstructions in conformity with Crane Manufacturers Association of America, Inc, Specification No. A disconnecting means shall be provided between the runway contact conductors and the power supply. No fixed work platform has been provided for servicing the unit. 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. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. The disconnecting means shall be located where it is readily accessible to qualified persons. Also, from time to time we update our guidance in response to new information. 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. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. While this is the most commonly accessed area, it is often necessary to also have space above the panel and on each side as well. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. Installations accessible to unqualified persons. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. 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. Because this cabinet you saw is located near an exit door, let's first look at OSHA's general requirements for exit routes, emergency action plans and fire prevention plans [20 CFR 1910.37-39]. Durability of markings. 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? 1. 1910.306 - Specific purpose equipment and installations. Exposed live parts on one side and grounded parts on the other side. Control power is off on a large number of machines. A single means to control both the electronic equipment and HVAC system is permitted. Occupational Safety & Health Administration, Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Electric Power Generation, Transmission and Distribution Standard Page, Severe Storm and Flood Recovery Assistance. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. In locations where electric equipment would be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. Unfortunately, it is often difficult for people to remember exactly how much distance from a panel things can be. 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. The manually operated switch shall be installed adjacent to this equipment. horizontally shall be provided. A new section, 450.14, requires a disconnecting means for most transformers. Motors and appliances. Lock out/tag out after disconnecting, before voltage testing. 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. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. Services, feeders, and branch circuits. Front working space. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The marking shall be of sufficient durability to withstand the environment involved. 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? 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. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. Clearance is required in the direction of access for operation, that is in the front. 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. Following the 110.26 NEC standards is fairly easy. February 7, 1996 Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. 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. 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. OSHA Electrical Panel Clearance Requirements. All panel controls shall be of dead-front construction. Conditions A, B, and C are as follows: Condition A - Exposed live parts on one side and no live or grounded parts on the other side of the working space, or exposed live parts on both sides effectively guarded by suitable wood or other insulating material. In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. 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. This paragraph applies to induction and dielectric heating equipment and accessories for industrial and scientific applications, but not for medical or dental applications or for appliances. One of the easiest and most effective ways to make sure that nobody places anything in the area around your electrical panels is to mark the area with floor marking tape. 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. 3Working space is not required in back of equipment such as dead-front switchboards or control assemblies that has 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. 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. A simple way to meet electrical panel clearance requirements is to use floor markings. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. 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. 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. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. Swimming pools, fountains, and similar installations. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. Therapeutic pools in health care facilities are exempt from these provisions. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. Auxiliary nonelectrical connections. At least one entrance not less than 24 inches (610 mm) wide and 6 feet 6 inches (1.98 m) high shall be provided to give access to the working space about electric equipment. Working space for equipment likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the following dimensions, except as required or permitted elsewhere in this subpart: The depth of the working space in the direction of access to live parts may not be less than indicated in Table S-1. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Clear spaces. Panels with 151 to 600 volts should have 42 of clearance around it. Specific purpose equipment and installations. 61, which is incorporated by reference as specified in Sec. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. OSHA requirements are set by statute, standards and regulations. This paragraph applies to X-ray equipment. Fixed electric equipment may be bonded to the energized conductive surfaces of the cell line, its attachments, or auxiliaries. Flexible cords and cables shall be listed for extra-hard usage. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. Clearance. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Access. Mr. John C. (Jack) Schuldt, Sr. Suitable enclosures or guards must be provided to prevent damage to this equipment. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. 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. Capable of accepting a lock. Application. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. In outdoor pool areas, lighting fixtures, lighting outlets, and ceiling-suspended (paddle) fans may not be installed over the pool or over the area extending 1.52 m (5 ft) horizontally from the inside walls of a pool unless no part of the lighting fixture of a ceiling-suspended (paddle) fan is less than 3.66 m (12 ft) above the maximum water level. The disconnecting means shall be capable of being locked in the open position. Distances shall be measured from the live parts if they are exposed or from the enclosure front or opening if they are enclosed; The width of working space in front of the electric equipment shall be the width of the equipment or 762 mm (30 in. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. 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. Arcing parts. Where there are live parts normally exposed on the front of switchboards or motor control centers, the working space in front of such equipment shall not be less than 3 feet (914 mm). In order for the 480 volt circuit(s) to be considered deenergized, the lockout and tagging requirements of paragraph 1910.333(b)(2) must be met. Your scenario and questions, and our replies, follow. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. These markings shall be of sufficient durability to withstand the environment involved. 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. Placed within view of the runway contact conductors. Marking. This page provides information that may aid in controlling electrical hazards in the workplace. The supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. They bring all the electrical lines into one centralized location so that the main power source can feed them. 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