Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. Application. NEC 110.26 (A) still applies even if equipment will be in an ESWC. 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. To put it simply, you must have a policy in place that will ensure that any electrical panel in your facility can be easily accessed and worked on at all times. Electrical panels are an essential component in any facility. This means you cannot place machinery or other equipment in the space around an electrical panel without making sure that it meets the NEC working clearance requirements. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. Other cord- and plug-connected, fixed or stationary equipment used with permanently installed pools. Identification of disconnecting means and circuits. 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. Interlock switches shall be used on all hinged access doors, sliding panels, or other such means of access to the applicator, unless the applicator is an induction heating coil at dc ground potential or operating at less than 150 volts ac. Flexible cords used with the following equipment may not exceed 0.9 m (3 ft) in length and shall have a copper equipment grounding conductor with a grounding-type attachment plug: Fountains. All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. 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. Lighting outlets and points of control. 1. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Voltage testing should follow lock out/tag out. 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. February 7, 1996 Another nice thing about having these standardized requirements is that they apply across national boarders. Equipment installed underwater shall be identified for the purpose. 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. We appreciate your interest in occupational safety and health. Type. President, Safety Specialties Incorporated Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Placed within view of the runway contact conductors. At least one entrance not less than 610 mm (24 in.) The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. These markings shall be of sufficient durability to withstand the environment involved. beyond the front of the electric equipment. Overcurrent protection of electrolytic cell dc process power circuits need not comply with the requirements of 1910.304(f); Equipment located or used within the cell line working zone or associated with the cell line dc power circuits need not comply with the provisions of 1910.304(g); and. 6. The following requirements apply to outdoor enclosed equipment accessible to unqualified employees: Ventilating or similar openings in equipment shall be so designed that foreign objects inserted through these openings will be deflected from energized parts; Where exposed to physical damage from vehicular traffic, suitable guards shall be provided; Nonmetallic or metal-enclosed equipment located outdoors and accessible to the general public shall be designed so that exposed nuts or bolts cannot be readily removed, permitting access to live parts; Where nonmetallic or metal-enclosed equipment is accessible to the general public and the bottom of the enclosure is less than 2.44 m (8.0 ft) above the floor or grade level, the enclosure door or hinged cover shall be kept locked; and. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. A disconnecting means shall be provided in the supply circuit. No underwater lighting fixtures may be installed for operation at over 150 volts between conductors. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. A warning sign shall be mounted on or next to the disconnecting means where multiple disconnecting means are used and parts of the controllers remain energized from a source other than the one disconnected. 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). 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. 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. Inside tents and concessions. Eight (8) to ten (10) hours of start-up time could be required to re-load processing bins, fluidizing lines and processing transitions. Capable of accepting a lock. Induction and dielectric heating equipment. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. 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. Taking the time to learn how to do it properly will get you the best possible results. Switchboards, panelboards, and distribution boards installed for the control of light and power circuits, and motor control centers shall be located in dedicated spaces and protected from damage. 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. Dear Mr. Schuldt: By partitions or screens so arranged that only qualified persons will have access to the space within reach of the live parts. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] 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). Thank you for your recent letter to the Occupational Safety and Health Administration (OSHA). It is also easy to verify. Line connectors are of the listed sequential-interlocking type so that load connectors are connected in the following sequence: Equipment grounding conductor connection; Grounded circuit-conductor connection, if provided; and, Ungrounded conductor connection; and so that disconnection is in the reverse order; or. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. How to determine requirementspart 2: To be on the safe side, the working space and space around electrical equipment should always be clear per 110.26 (A), if possible. Circuits supplying power to ungrounded receptacles for hand-held, cord- and plug-connected equipment shall meet the following requirements: The circuits shall be electrically isolated from any distribution system supplying areas other than the cell line working zone and shall be ungrounded; The circuits shall be supplied through isolating transformers with primaries operating at not more than 600 volts between conductors and protected with proper overcurrent protection; The secondary voltage of the isolating transformers may not exceed 300 volts between conductors; and. 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? A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. The minimum clear working space in front of electric equipment such as switchboards, control panels, switches, circuit breakers, motor controllers, relays, and similar equipment shall not be less than specified in Table K-2 unless otherwise specified in this subpart. Sincerely, Control panels not located in the same space as the drive machine shall be located in cabinets with doors or panels capable of being locked closed. Cord connectors may not be laid on the ground unless listed for wet locations. If an irrigation machine has a stationary point, a grounding electrode system shall be connected to the machine at the stationary point for lightning protection. Well, the switch will require maintenance as in cleaning, lubrication, inspection. 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; The width of working space in front of the electric equipment shall be the width of the equipment or 762 mm (30 in. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. In existing buildings where electrical equipment is being replaced, minimum 3' working clearance shall be permitted for nominal voltage to ground less than 151V or 3'-6" for nominal voltage to ground greater than 150V between dead-front switchboards, switchgear, Flexible cords and cables shall be listed for extra-hard usage. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. This page provides information that may aid in controlling electrical hazards in the workplace. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Auxiliary nonelectrical connections. Working clearances. 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. At 1-800-743-5000 OSHA says and plug-connected, fixed or stationary equipment used with permanently installed.... 2002 NEC for motor disconnect locations will help make safety a reality doors shall either open at 90. 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