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. 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. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. 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. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. When employees are trained to work safely, through the requirements, they should be able to anticipate and avoid injury from job related hazards. This could be literally hundreds of machines. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. 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. 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). Examination, installation, and use of equipment -. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. Clearance. Working space is not required in back of assemblies such as dead-front switchboards or motor control centers 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. 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. Classification by type, size, voltage, current capacity, specific use. Diffraction- and irradiation-type equipment shall have a pilot light, readable meter deflection, or equivalent means to indicate when the equipment is energized, unless the equipment or installation is effectively enclosed or is provided with interlocks to prevent access to live current-carrying parts during operation. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. 1910.305 (g): Wiring requirements for flexible cords and cables. 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. Receptacles that are located within 4.57 m (15 ft), or 6.08 m (20 ft) if the installation was built after August 13, 2007, of the inside walls of the pool shall be protected by ground-fault circuit interrupters. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. For serious, other-than-serious, and posting requirement violations, OSHA issues a fine amount of $14,502 per violation. Distances shall be measured from the live parts if they are exposed, or from the enclosure front or opening if the live parts are enclosed. 1910.6, (formerly the Electric Overhead Crane Institute, Inc). As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6 feet of headroom space. 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. 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. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). Lightning protection. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment. Safety of equipment shall be determined using the following considerations: Suitability for installation and use in conformity with the provisions of this subpart; Note to paragraph (b)(1)(i) of this section:Suitability of equipment for an identified purpose may be evidenced by listing or labeling for that identified purpose. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. 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. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. 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. Outdoors, it must be GFCI protected. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. In all cases, the working space shall permit at least a 90-degree opening of equipment doors or hinged panels; and. Also, from time to time we update our guidance in response to new information. If we can be of further assistance, please contact the Office of General Industry [at (202) 693-1850]. Hot glue machines would be shutdown and the glue would set. Cooling. 8. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. 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. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. 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. Unless identified for use in the operating environment, no conductors or equipment shall be located in damp or wet locations; where exposed to gases, fumes, vapors, liquids, or other agents that have a deteriorating effect on the conductors or equipment; or where exposed to excessive temperatures. Induction heating coils shall be protected by insulation or refractory materials or both. 5. We appreciate your interest in occupational safety and health. Readily accessible and operable from the ground or floor level; Arranged to be locked in the open position; and. 3. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. Except as provided in paragraph (b)(2)(iv) of this section, a motor-circuit switch, molded case switch, or circuit breaker shall be provided in the leads from the runway contact conductors or other power supply on all cranes and monorail hoists. The depth shall be as required in Table K-2. Panels with 151 to 600 volts should have 42 of clearance around it. 1. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. Thank you for your interest in occupational safety and health. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. Condition B - Exposed live parts on one side and grounded parts on the other side. Arcing parts. This paragraph covers the installation of portable wiring and equipment, including wiring in or on all structures, for carnivals, circuses, exhibitions, fairs, traveling attractions, and similar events. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. These markings can include floor marking tape, floor signs, and labels. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. Note that our enforcement guidance may be affected by changes to OSHA rules. 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. (150 mm) 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. A limit switch or other device shall be provided to prevent the load block from passing the safe upper limit of travel of any hoisting mechanism. . A shunt trip device that opens the fused disconnect or circuit breaker when a switch located in the ride operator's console is closed is a permissible method of opening the circuit. John B. 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. At least one entrance shall be provided to give access to the working space about electric equipment. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. Electrical is addressed in specific OSHA standards for general industry and maritime. Electric 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. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. Specific purpose equipment and installations. 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. 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. Single-car and multicar installations. Examination, installation, and use of equipment -. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. Electrical Safety. 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). 0.9 Meter (3 Ft) Clearance When Facing Other Electrical Panels <480V. Employers may only use portable distribution and termination boxes that meet the following requirements: Occupational Safety & Health Administration. 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. 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. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. 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. Detachable panels not normally used for access to such parts shall be fastened in a manner that will make them difficult to remove (for example, by requiring the use of tools). Cranes and hoists. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. 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. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. No architectural appurtenance or other equipment may be located in the working space required by paragraph (g)(1)(i) of this section. Pan 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. Where rear access is required to work on deenergized parts on the back of enclosed equipment, a minimum working space of 762 mm (30 in.) 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. Arcing parts. 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. 0.9 Meter. Insulated wire or insulated busbars operating at not over 300 volts are not considered live parts. Control panels. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. Your question has been restated below for clarity. 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. Inside tents and concessions. Durability of markings. This paragraph applies to the installation of the electrical components and accessory equipment of electrolytic cells, electrolytic cell lines, and process power supply for the production of aluminum, cadmium, chlorine, copper, fluorine, hydrogen peroxide, magnesium, sodium, sodium chlorate, and zinc. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. 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. 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. This paragraph applies to equipment operating at 600 volts, nominal, or less. The fact is, however, that it goes well beyond that. Defiance, Ohio 43512 Installation and use. 2.0 Meter. 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. Disconnecting means. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 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