If the disconnecting means is an integral part of the motor controller, it shall be operable without opening the enclosure. The disconnecting means shall disconnect the sign or outline lighting system and the controller from all ungrounded supply conductors. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Hoses shall be of a nonconductive material. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) 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; By placement on a suitable balcony, gallery, or platform so elevated and otherwise located as to prevent access by unqualified persons; or. 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. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. No underwater lighting fixtures may be installed for operation at over 150 volts between conductors. 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. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. Materials such as solder, fluxes, inhibitors, and compounds, where employed, shall be suitable for the use and shall be of a type that will not adversely affect the conductors, installation, or equipment. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. Question 2: A motor control center does not meet Table S-1 work clearances required under paragraph 1910.303(g)(1) when working on live parts operating at 600 volts or less. 61, which is incorporated by reference as specified in Sec. All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. Disconnecting means. 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). This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. All panel controls shall be of dead-front construction. By location in a room, vault, or similar enclosure that is accessible only to qualified persons; By suitable permanent, substantial partitions or screens so arranged so that only qualified persons will have access to the space within reach of the live parts. 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 disconnecting means shall be provided with a sign to identify the location of the supply-side overcurrent protective device. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. Application for variances are covered under 29 CFR Part 1905. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. Location. Other questions you can expect from an OSHA inspector include: Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. 8. 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. If more than one dc cell line process power supply serves the same cell line, a disconnecting means shall be provided on the cell line circuit side of each power supply to disconnect it from the cell line circuit. Suitable enclosures or guards must be provided to prevent damage to this equipment. Keep the fire inside the fireplace. Examples of solutions include the use of insulation, guarding, grounding, electrical protective devices, and safe work practices. Control equipment that by its very nature or because of other requirements in this subpart must be adjacent to or within sight of its operating machinery is permitted in the dedicated space. Flexible cords and cables shall be listed for extra-hard usage. Miles, Jr., Director Lighting outlets and points of control. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. 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. Occupational Safety & Health Administration. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 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. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. 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. Three rules from the general industry electrical standard are among Oregon OSHA's top 25 violations every year: 1910.303 (b): Examination, installation, and use of 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. 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. Installations accessible to unqualified persons. 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. Arcing parts. It states: For one- and two-family dwelling units, all service conductors shall terminate in disconnecting means having a short-circuit current rating equal to or greater than the available fault current, installed in a readily accessible outdoor location. 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. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. We appreciate your interest in occupational safety and health. 1. The disconnecting means shall be a switch or circuit breaker, and its rating may not be less than that necessary to accommodate overcurrent protection. Auxiliary nonelectrical connections such as air hoses, water hoses, and the like, to an electrolytic cell, its attachments, or auxiliary equipment may not have continuous conductive reinforcing wire, armor, braids, or the like. 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 ampere rating of this disconnecting means may not be less than the supply conductor ampacity. Richard E. Fairfax, Director OSHA Electrical Panel Clearance Requirements. This would permit the motor disconnect to be located above 6'7" Chris Dennis Alwon Moderator Staff member Location Chapel Hill, NC Occupation Retired Electrical Contractor 1910.303 (g) (1) (vi) (B) For installations built on or after August 13, 2007, 1.98 m (6.5 ft), except that where the electrical equipment exceeds 1.98 m (6.5 ft) in height, the minimum headroom may not be less than the height of the equipment. 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. 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. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. Deteriorating agents. Permanent and conspicuous warning signs shall be provided, reading substantially as follows: Pipes or ducts that are foreign to the electrical installation and that require periodic maintenance or whose malfunction would endanger the operation of the electrical system may not be located in the vicinity of service equipment, metal-enclosed power switchgear, or industrial control assemblies. Directorate of Compliance Programs, Occupational Safety & Health Administration, Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Hoppers and transitions could plug up with product. One last option is to put down the initial square of floor marking, but then use a floor sign that specifically says not to place anything in that area. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. Identification of manufacturer and ratings. Mr. William Overby 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. 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. "Infeasibility" is considered by OSHA on a case by case, work application basis. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] The manually operated switch shall be installed adjacent to this equipment. Boxes shall be designed so that no live parts are exposed to accidental contact. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably guarded. Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of 30 inches (762 mm) horizontally shall be provided. Monitoring System (TPMS) Sensor Training in this section. The main disconnecting means for a center pivot irrigation machine shall be located at the point of connection of electrical power to the machine or shall be visible and not more than 15.2 m (50 ft) from the machine. 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? Electrical installations that are open to unqualified persons shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area, access to which is controlled by a lock. 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. 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 marking shall be of sufficient durability to withstand the environment involved. Clearance. A single means to control both the electronic equipment and HVAC system is permitted. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. 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. (150 mm) Electrically driven or controlled irrigation machines -. 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. 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. This is in response to your April 30, 1995 letter requesting interpretation of the electrical standard, 29 CFR Subpart S. Your letter, which was addressed to Mr. Joseph Pipkin, who is Director of the Office of Electrical, Electronics and Mechanical Engineering Safety Standards in the Directorate of Safety Standards Programs of the Occupational Safety and Health Administration (OSHA) was forwarded to the Directorate of Compliance Programs for response. The lighting outlets shall be so arranged that persons changing lamps or making repairs on the lighting system will not be endangered by live parts or other equipment. 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. 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. OSHA standard 1910.303 clearance requirements apply to many types of electrical equipment, not just breaker panels. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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.) 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. Approval. Interrupting rating. 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. Auxiliary nonelectrical connections. Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. Induction and dielectric heating equipment shall be protected as follows: Protective cages or adequate shielding shall be used to guard work applicators other than induction heating coils. There would be no additional need to deenergize circuits for other equipment to deenergize a motor and its controller disconnected by an individual disconnecting means which meets paragraph 1910.305(j)(4) requirements. 1Minimum depth of clear working space in front of electric equipment with a nominal voltage to ground above 25,000 volts may be the same as that for 25,000 volts under Conditions A, B, and C for installations built before April 16, 1981. The Electrical Safety Authority ( ESA) was established in 1999 . OSHA 1910.145(f)(4)(ii): "Signal word must be readable from a distance of 5 feet (1.52m)." OSHA 1910.303(e): "Electrical equipment may not be used unless the following markings have been placed on the equipment. OSHA Requirements for Electrical Panel Floor Markings Splices. Panels with 151 to 600 volts should have 42 of clearance around it. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. 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. 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. Note that our enforcement guidance may be affected by changes to OSHA rules. The disconnecting means shall be within sight of the equipment served. 2 or larger. 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. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. 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). For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. In electric equipment rooms, the illumination may not be controlled by automatic means only. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. 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. 4. Electric equipment shall be firmly secured to the surface on which it is mounted. Approval. Examination, installation, and use of equipment -. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Circuit impedance and other characteristics. These are generic codes which may not apply to all vehicles and we recommend you . The disconnecting means shall be a listed device. 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). . OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. These markings can include floor marking tape, floor signs, and labels. Also, from time to time we update our guidance in response to new information. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. Access and entrance to working space. Following the 110.26 NEC standards is fairly easy. Employers may only use portable distribution and termination boxes that meet the following requirements: Occupational Safety & Health Administration. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. This letter constitutes OSHA's interpretation of the requirements discussed. Electric equipment and wiring methods in or on rides, concessions, or other units shall be provided with mechanical protection where such equipment or wiring methods are subject to physical damage. Induction and dielectric heating equipment. On escalators and moving walks, the disconnecting means shall be installed in the space where the controller is located. 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. 600 Volts, nominal, or less. 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. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. A new section, 450.14, requires a disconnecting means for most transformers. 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. Except for underground box covers that weigh over 45.4 kg (100 lb), doors and covers of enclosures used solely as pull boxes, splice boxes, or junction boxes shall be locked, bolted, or screwed on. Disconnecting means for runway conductors. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. 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? By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. The following requirements apply to indoor installations that are accessible to other than qualified persons: The installations shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area to which access is controlled by a lock; Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs; and. horizontally shall be provided. Where the disconnecting means is out of the line of sight from any section that may be energized, the disconnecting means shall be capable of being locked in the open position. If fixed electric equipment is mounted on an energized conductive surface, it shall be bonded to that surface. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. Arc welders. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. 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. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. 3. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. Enclosure for electrical installations. 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. Application. 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. 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. No architectural appurtenance or other equipment may be located in the working space required by paragraph (g)(1)(i) of this section. Electrical Safety Orders. 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. Thank you for your interest in occupational safety and health. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. 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. Group 1. Lightning protection. 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. This receptacle shall be located not more than 1.98 m (6.5 ft) above the floor, platform, or grade level serving the pool. Be listed for such use 8.5 ft ) of the water surface of permanently installed pools resistance welder and control... Enclose and protect other equipment, 600 V or less to ground portable electric equipment the! Through these openings will be deflected from energized parts water surface of permanently installed pools the illumination may be. Control both the electronic equipment and HVAC system is permitted: occupational safety & health Administration and provide... 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