other equipment foreign to the electrical installation shall be located in . 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. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. 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 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. Note to paragraph (b)(8)(i) of this section:Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials are not considered secure means of fastening electric equipment. Richard E. Fairfax, Director If we can be of further assistance, please contact the Office of General Industry [at (202) 693-1850]. General. 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. Inside tents and concessions. The marking shall be of sufficient durability to withstand the environment involved. The marking required by paragraph (f)(5)(i) of this section shall be readily visible and shall state Caution - Series Combination System Rated __ Amperes. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. 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. 3. A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. Electrical equipment provided with ventilating openings shall be installed so that walls or other obstructions do not prevent the free circulation of air through the equipment. For example, a switchboard is located next to a disconnect (safety) switch. High-Voltage Electrical Safety Orders (Sections 2700 - 2989) Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. Auxiliary nonelectrical connections such as air hoses, water hoses, and the like, to an electrolytic cell, its attachments, or auxiliary equipment may not have continuous conductive reinforcing wire, armor, braids, or the like. Note to paragraph (j)(1) of this section: In determining these dimensions, the distance to be measured is the shortest path the supply cord of an appliance connected to the receptacle would follow without piercing a floor, wall, or ceiling of a building or other effective permanent barrier. A disconnecting means shall be provided between the runway contact conductors and the power supply. Sincerely, This is in response to your April 30, 1995 letter requesting interpretation of the electrical standard, 29 CFR Subpart S. Your letter, which was addressed to Mr. Joseph Pipkin, who is Director of the Office of Electrical, Electronics and Mechanical Engineering Safety Standards in the Directorate of Safety Standards Programs of the Occupational Safety and Health Administration (OSHA) was forwarded to the Directorate of Compliance Programs for response. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. Circuit impedance and other characteristics. The tape can be placed down in the proper spots to make sure you get immediate results. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. . Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. 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. This paragraph applies to equipment operating at 600 volts, nominal, or less. Following the 110.26 NEC standards is fairly easy. The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. 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. With these tools, floor marking for electrical panel compliance can be accomplished without spending too much on time or effort. 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. Remote crane or hoist controls that may introduce hazardous electrical conditions into the cell line working zone shall employ one or more of the following systems: Pendant pushbutton with nonconductive supporting means and with nonconductive surfaces or ungrounded exposed conductive surfaces; or. 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. 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. Electric equipment shall be installed in a neat and workmanlike manner. Motor controllers. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. Front working space. Electrical installations having exposed live parts shall be accessible to qualified persons only and shall comply with the applicable provisions of paragraph (j)(3) of this section. It also helps by segmenting the power off in a way that prevents a full power outage when there is an issue in one area. Connectors and cable connections may not be placed in audience traffic paths or within areas accessible to the public unless guarded. The marking shall be of sufficient durability to withstand the environment involved. Type. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. Doors or detachable panels shall be employed for internal access. 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. 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. 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. wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. No marks or blemishes on wheel faces. Electric equipment shall be firmly secured to the surface on which it is mounted. If remote controls are used for applying power, a selector switch shall be provided and interlocked to provide power from only one control point at a time. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. Occupational Safety & Health Administration. Except as provided in paragraph (b)(2)(iv) of this section, a motor-circuit switch, molded case switch, or circuit breaker shall be provided in the leads from the runway contact conductors or other power supply on all cranes and monorail hoists. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. Electrical panels are an essential component in any facility. Your question has been restated below for clarity. Integrated electrical systems covered by 1910.308(g) need not have the disconnecting means required by paragraph (e)(1) of this section. It designs clearance requirements that make sure employees have enough space around workplace equipment and in work and walking spaces. Portable distribution and termination boxes. What is the residential electrical panel clearance requirements? This letter constitutes OSHA's interpretation of the requirements discussed. Many workers are unaware of the potential electrical hazards present in their work environment, which makes them more vulnerable to the danger of electrocution. For the NEC 2020, there's an added article titled 230.85 Emergency Disconnects. They bring all the electrical lines into one centralized location so that the main power source can feed them. Control panels. Induction and dielectric heating equipment. The disconnecting means may be omitted where a monorail hoist or hand-propelled crane bridge installation meets all of the following conditions: The unit is controlled from the ground or floor level; The unit is within view of the power supply disconnecting means; and. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. Clearance. However, a lighting fixture or lighting outlet that was installed before April 16, 1981, may be located less than 1.52 m (5 ft) measured horizontally from the inside walls of a pool if it is at least 1.52 m (5 ft) above the surface of the maximum water level and is rigidly attached to the existing structure. In locations where electric equipment would be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. 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. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. Measuring off the required distance around the electrical panels and putting down floor markings will make it extremely easy to see exactly where things can and cannot be placed. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. 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. For equipment connected to a 120-volt branch circuit of 30 amperes or less, a grounding-type attachment plug cap and receptacle of proper rating may serve as a disconnecting means. Where doors are used giving access to voltages of over 1000 volts ac or dc, either mechanical lockouts with a disconnecting means to prevent access until circuit parts within the cubicle are deenergized, or both door interlocking and mechanical door locks, shall be provided. 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. These are generic codes which may not apply to all vehicles and we recommend you . 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. 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. 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. 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. 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. 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