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. 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. 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. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. 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. No marks or blemishes on wheel faces. 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. 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. 1910.306 - Specific purpose equipment and installations. Control power is off on a large number of machines. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. Where paralleled sets of current-carrying single-pole separable connectors are provided as input devices, they shall be prominently labeled with a warning indicating the presence of internal parallel connections. 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. Space about electric equipment. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. NEC 110.26 (A) still applies even if equipment will be in an ESWC. Dayton, Ohio 45420 Once again, however, the NFPA 70e electrical panel clearance requirements will match those of the NEC and of OSHA. 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. Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs. Where accessible to unqualified persons, the enclosure for the switch or circuit breaker shall be of the lockable type. Disconnecting means. 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 fact is, however, that it goes well beyond that. For example, a switchboard is located next to a disconnect (safety) switch. 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. Disconnecting means for runway conductors. 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. Entrance and access to workspace. OSHA Requirements for Electrical Panel Floor Markings It is not an official legal edition of the CFR. The width of Panel or 0.762 Meter which is Greater. Outdoor electric equipment shall be installed in suitable enclosures and shall be protected from accidental contact by unauthorized personnel, or by vehicular traffic, or by accidental spillage or leakage from piping systems. Another safety focused agency is the National Fire Protection Association, or NFPA. 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 designed for the purpose. Installation and use. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. 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. 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? Electric equipment that depends on the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment. Capable of accepting a lock. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Services, feeders, and branch circuits. Parts of electric equipment that in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material. 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.) 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. Circuit impedance and other characteristics. Electric equipment shall be free from recognized hazards that are likely to cause death or serious physical harm to employees. 7. 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. Electrically driven or controlled irrigation machines -. 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. Arcing parts. Carnivals, circuses, fairs, and similar events. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. All electrical conductors and equipment shall be approved. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. 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. Working space about electric equipment. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. Panels with 151 to 600 volts should have 42 of clearance around it. Single conductor cable shall be size No. 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. 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. 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? Maximum Number of Disconnects (i.e. Installations accessible to unqualified persons. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. Type. Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. Visit the Electric Power Generation, Transmission and Distribution Standard Page The ampere rating of this disconnecting means may not be less than the supply conductor ampacity. A disconnecting means shall be provided for each motor and controller. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. 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. Insulation integrity. Examination. Access. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. 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. 2 or larger. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. . 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). 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. 3. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. horizontally shall be provided. 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. 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. 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. Operation. Cables and mats shall be arranged so as not to present a tripping hazard. 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. This is necessary for all types of work including examination of the electrical panel, making adjustments to the electrical panel, servicing the electrical panel, and of course, performing maintenance on the electrical panel. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. OSHA requirements are set by statute, standards, and regulations. Scenario: Workplace motor control centers have boxes with 480 volts disconnects and 110 volt control power with the same box. Identified Replacement Component Required.. 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. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations.