Parts of electric equipment which in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. 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. At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. Except as elsewhere required or permitted in this subpart, the minimum clear working space in the direction of access to live parts of electric equipment may not be less than specified in Table S-2. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. 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. Also, from time to time we update our guidance in response to new information. Note that our enforcement guidance may be affected by changes to OSHA rules. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. For equipment operating at 600 volts, nominal or less to ground, electrical panels must have a minimum of three feet of clearance in front of the panel and a minimum clearance width of 2.5 feet or the width of the equipment, whichever is greater. The area must not only remain completely clear of items at all times, but it also needs to be accessible. The disconnecting means shall be a listed device. 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. Exposed live parts on one side and grounded parts on the other side. Where accessible to unqualified persons, the enclosure for the switch or circuit breaker shall be of the lockable type. Similarly, panels with 151-600 volts require 42 inches of clearance. 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. Wire connectors or splicing means installed on conductors for direct burial shall be listed for such use. Another nice thing about having these standardized requirements is that they apply across national boarders. Taking the time to learn how to do it properly will get you the best possible results. 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. Installation and use. 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. 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. Electrical panels need to be installed 4 off the ground with the center grip handle of the highest circuit breaker is no more than 6'7 high to be NEC compliant. 2. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Electrolytic cells. Operation. Clear Height in front of Panel >480V. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. 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. Capable of accepting a lock. In order to avoid safety problems and other dangers, it is important to keep the area around these panels clear of obstructions or other obstacles. 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. 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. 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. 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. Includes references that provide information related to electrical in construction including OSHA's electrical construction regulations, hazard recogition, possible solutions and additional resources. All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor. Limit switch. 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. A clearance of at least 3 feet is required for equipment using 120 to 250 volts. 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. 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. OSHA requirements are set by statute, standards and regulations. Enclosure for electrical installations. The initial electrical inspection for a . 0.9 Meter. 1910.305 (g): Wiring requirements for flexible cords and cables. 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. 2932 Hazel Ave. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. Illumination shall be provided for all working spaces about service equipment, switchboards, panelboards, and motor control centers installed indoors. While this is the most commonly accessed area, it is often necessary to also have space above the panel and on each side as well. Motors and appliances. 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.) The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. A disconnecting means shall be provided in the supply circuit. However, switches or other equipment operating at 600 volts, nominal, or less, and serving only equipment within the high-voltage vault, room, or enclosure may be installed in the high-voltage enclosure, room, or vault if accessible to qualified persons only. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. Working clearances. A disconnecting means shall be provided for each motor and controller. When it is necessary to perform work on energized equipment, OSHA 1910.333 (a) (2) requires safety-related work practices to be used and NFPA 70E Article 110.8 (B) (1) requires an Electrical Hazard Analysis before work is performed on live equipment operating at 50 volts and higher. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. Most facilities will already have floor marking tape on hand since it is one of the most commonly used safety items around. 1910.305 (b): Wiring requirements for cabinets, boxes, and fittings. Where there is more than one driving machine in a machine room, the disconnecting means shall be numbered to correspond to the identifying number of the driving machine that they control. The points of control shall be located so that persons are prevented from contacting any live part or moving part of the equipment while turning on the lights. Each ride and concession shall be provided with a fused disconnect switch or circuit breaker located within sight and within 1.83 m (6 ft) of the operator's station. Mounting. Our interpretations letters explain the requirements, and how they apply to particular circumstances, but they can not create additional employer obligations. 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. 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. 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. 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). Reply: Deenergizing the 110 volt control circuit in the above scenario appears to be infeasible as discussed in Note 2 following paragraph 1910.333(a)(1). This is for ANY electrical panel including the corner of the condenser where the wiring enters. Equipment intended to interrupt current at fault levels shall have an interrupting rating sufficient for the nominal circuit voltage and the current that is available at the line terminals of the equipment. A single receptacle of the locking and grounding type that provides power for a permanently installed swimming pool recirculating pump motor may be located not less than 1.52 m (5 ft) from the inside walls of a pool. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. 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. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. Dayton, Ohio 45420 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. 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. Other questions you can expect from an OSHA inspector include: On single-car and multicar installations, equipment receiving electrical power from more than one source shall be provided with a disconnecting means for each source of electrical power. 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). This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. Induction and dielectric heating equipment. Note that our enforcement guidance may be affected by changes to OSHA rules. These markings can include floor marking tape, floor signs, and labels. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. The overcurrent protection may not exceed the ampere rating of the receptacle, except as permitted in 1910.305(j)(4) for motor loads; Where single-pole connectors are used, they shall comply with the following: Where ac single-pole portable cable connectors are used, they shall be listed and of the locking type. In addition, from time to time we update our guidance in response to new information. The disconnecting means shall be operable from a location readily accessible from the X-ray control. Does it require maintenance while energized? Connectors and cable connections may not be placed in audience traffic paths or within areas accessible to the public unless guarded. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Lighting fixtures, lighting outlets, and ceiling suspended (paddle) fans. No marks or blemishes on wheel faces. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. A disconnecting means shall be provided between the runway contact conductors and the power supply. Where bare energized parts at any voltage or insulated energized parts above 600 volts, nominal, to ground are located adjacent to such entrance, they shall be suitably guarded. Panels with 151 to 600 volts should have 42 of clearance around it. Except as required or permitted elsewhere in this subpart, the dimension of the working space in the direction of access to live parts operating at 600 volts or less and likely to require examination, adjustment, servicing, or maintenance while alive shall not be less than indicated in Table K-1. Grouping. Radiographic and fluoroscopic-type equipment shall be effectively enclosed or shall have interlocks that deenergize the equipment automatically to prevent ready access to live current-carrying parts. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. X-Ray equipment. July 26, 2004 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. 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