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. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. The disconnecting means shall be capable of being locked in the open position. 2. 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. 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. Sufficient space shall be provided and maintained about electric equipment to permit ready and safe operation and maintenance of such equipment. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. 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. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. 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. 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. 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. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. Sincerely, 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. In previous NEC editions, transformers didn't require a disconnecting means. 3. 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. Services, feeders, and branch circuits. Disconnecting means required by this subpart shall be capable of being locked in the open position. This means if you have an inspection, you can count on the fact that the OSHA electrical panel clearance will be measured by the OSHA inspector to make sure that you are in compliance. On elevators without generator field control, the disconnecting means shall be located within sight of the motor controller. 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. Does it require maintenance while energized? Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage sufficient for the current that must be interrupted. Keep the fire inside the fireplace. Signs and outline lighting systems located within fountains shall have the disconnect located at least 1.52 m (5.0 ft) from the inside walls of the fountain. Classification by type, size, voltage, current capacity, specific use. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. General. OSHA 1910.179 General Requirements (Adapted from www.osha.gov) 1910.179. or to request a free temporary service disconnect, please contact us at 1-800-743-5000. 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. Identification of disconnecting means and circuits. It is also easy to verify. This page provides information that may aid in controlling electrical hazards in the workplace. OSHA's standard for general electrical requirements (29 CFR 1910.303) includes a section for establishing and maintaining space around electrical panels and other systems that require servicing, adjustments, or maintenance while energized. OSHA Electrical Panel Clearance Requirements. Question: What would OSHA consider to be a safe distance for setting extra stock or empty containers from any electrical equipment such as ladder cable trays? The specific electrical panel clearance requirements will depend on what area you are looking at, and how much voltage there is going through the panel. Examination. Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. The disconnecting means shall be within sight of the equipment served. 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. Minimum clear distances may be 0.7 m (2.5 ft) for installations built before April 16, 1981. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. The relevant section of the national electric code here is NEC 110.26. All panel controls shall be of dead-front construction. Pan Identification of manufacturer and ratings. 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. Single conductor cable shall be size No. Headroom. 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. Even if they know how much room in inches is required, they may not be able to properly estimate how much room they are leaving when placing items in the area. Most people think only about the area directly in front of the electrical panel. Other markings giving voltage, current, wattage, or other ratings as necessary. 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). Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. 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. Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). 2 or larger. Thank you for your interest in occupational safety and health. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. Access. Cord- and plug-connected equipment. 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. 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. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. 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. Lock out/tag out after disconnecting, before voltage testing. Electric equipment shall be free from recognized hazards that are likely to cause death or serious physical harm to employees. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided. No fixed work platform has been provided for servicing the unit. 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. The disconnecting means shall be constructed, enclosed, or located so as to avoid contact by employees with its live parts. 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. Protection of electric equipment. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Electrical wiring for temporary lighting, where installed inside of tents and concessions, shall be securely installed, and, where subject to physical damage, shall be provided with mechanical protection. Installation and use. President, Safety Specialties Incorporated The depth shall be as required in Table K-2. Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. 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. Placed within view of the runway contact conductors. 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 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. Safety of equipment shall be determined on the basis of the following considerations: Suitability for installation and use in conformity with the provisions of this subpart. 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. Workspace about equipment. 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. Note that our enforcement guidance may be affected by changes to OSHA rules. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Arcing parts. Hot glue machines would be shutdown and the glue would set. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. 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Electrical installation requirements ft ) of the protection thus provided to the space.
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osha electrical disconnect clearance requirements