1910.6, (formerly the Electric Overhead Crane Institute, Inc). Most people think only about the area directly in front of the electrical panel. Clear spaces. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? Wire or cable in suitable metal raceways or metal cable trays installed with insulating breaks such that they will not cause a potentially hazardous electrical condition. Disconnecting means. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. Durability. Lightning protection. The relevant section of the national electric code here is NEC 110.26. 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. Safety electrical work practices; motor disconnects;work clearances. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. 8. A ground-fault circuit interrupter shall be installed in the branch circuit supplying underwater fixtures operating at more than 15 volts. 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 clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. The minimum working space height required for this disconnect switch is 6 1 / 2 feet (see Figure 1). 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. The type of enclosure used in a given case shall be designed and constructed according to the hazards associated with the installation. Where bare energized parts at any voltage or insulated energized parts above 600 volts are located adjacent to such entrance, they shall be guarded. other equipment foreign to the electrical installation shall be located in . 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. Examination, installation, and use of equipment -. Reply: 29 CFR 1910.303(g)(2)(ii) and 1910.303(h)(2)(ii) address the protection of electric equipment that may be exposed to physical damage. Conductors and equipment used on circuits exceeding 600 volts, nominal, shall comply with all applicable provisions of paragraphs (a) through (g) of this section and with the following provisions which supplement or modify those requirements. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. 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? For serious, other-than-serious, and posting requirement violations, OSHA issues a fine amount of $14,502 per violation. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. Also, from time to time we update our guidance in response to new information. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. 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. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. This exception was put in to correspond to 430.107 that requires at least one of the disconnecting means required for a motor and motor controller to be readily accessible. 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. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. Openings in ventilated dry-type transformers and similar openings in other equipment shall be designed so that foreign objects inserted through these openings will be deflected from energized parts. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. Connection of conductors to terminal parts shall ensure a good connection without damaging the conductors and shall be made by means of pressure connectors (including set-screw type), solder lugs, or splices to flexible leads. 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. The tape can be placed down in the proper spots to make sure you get immediate results. Lock out/tag out after disconnecting, before voltage testing. horizontally shall be provided. It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. 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. A disconnecting means shall be provided for each motor and controller. 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 . 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. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. 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 The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. 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. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. 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. 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. 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. Maximum Number of Disconnects (i.e. Working clearances. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. For indoor installation, the dedicated space shall comply with the following: The space equal to the width and depth of the equipment and extending from the floor to a height of 1.83 m (6.0 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. In previous NEC editions, transformers didn't require a disconnecting means. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. Therapeutic pools in health care facilities are exempt from these provisions. Hundreds of motors would be shutoff. 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. Identification of manufacturer and ratings. horizontally shall be provided. Driving machines, motor-generator sets, 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 to prevent starting. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. All panel controls shall be of dead-front construction. OSHA Requirements for Electrical Panel Floor Markings Please refer to paragraph 1910.305(j)(4) which, with exceptions, requires an individual disconnecting means for each motor and its associated controller. 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. 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. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." OSHA requirements are set by statute, standards, and regulations. On elevators without generator field control, the disconnecting means shall be located within sight of the motor controller. Clear Height in front of Panel <480V. They regulate companies to maintain safe and healthy working conditions and to provide suitable training and assistance to their employees before doing their jobs. Please accept our apology for the delay in responding. 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. Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. No provision may be made to close this disconnecting means automatically (that is, power may only be restored by manual means). Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. 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