The lighting outlets shall be so arranged that persons changing lamps or making repairs on the lighting system will not be endangered by live parts or other equipment. 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. General. 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. A disconnecting means shall be provided between the runway contact conductors and the power supply. No provision may be made to close this disconnecting means automatically (that is, power may only be restored by manual means). John B. 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. Condition B - Exposed live parts on one side and grounded parts on the other side. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. Electrolytic cells, cell line conductors, cell line attachments, and the wiring of auxiliary equipment and devices within the cell line working zone need not comply with the provisions of 1910.303 or 1910.304(b) and (c). 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. However, working space is not required in back of equipment such as deadfront switchboards or control assemblies 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. Warning labels or signs that read DANGER - HIGH VOLTAGE - KEEP OUT shall be attached to the equipment and shall be plainly visible where persons might contact energized parts when doors are opened or closed or when panels are removed from compartments containing over 250 volts ac or dc. Electric equipment may not be used unless the following markings have been placed on the equipment: The manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product may be identified; and. 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. Soldered splices shall first be so spliced or joined as to be mechanically and electrically secure without solder and then soldered. Where circuit breakers or fuses are applied in compliance with the series combination ratings marked on the equipment by the manufacturer, the equipment enclosures shall be legibly marked in the field to indicate that the equipment has been applied with a series combination rating. Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. Boxes shall be designed so that no live parts are exposed to accidental contact. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. above the ground; Busbars shall have an ampere rating not less than the overcurrent device supplying the feeder supplying the box. Electrical Safety. Resistance welders. Permanent and conspicuous warning signs shall be provided, reading substantially as follows: Pipes or ducts that are foreign to the electrical installation and that require periodic maintenance or whose malfunction would endanger the operation of the electrical system may not be located in the vicinity of service equipment, metal-enclosed power switchgear, or industrial control assemblies. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. 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. 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. 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. Hot glue machines would be shutdown and the glue would set. 3. The disconnecting means shall be an enclosed externally operable fused motor circuit switch or circuit breaker capable of being locked in the open position. 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. 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 marking shall be of sufficient durability to withstand the environment involved. Where bare energized parts at any voltage or insulated energized parts above 600 volts are located adjacent to such entrance, they shall be guarded. 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. 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. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. 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. Such disconnecting means shall consist of a motor-circuit switch, circuit breaker, or molded case switch. July 26, 2004 You must also have a 120vac 15 amp service outlet within 25ft. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) Where energized parts are exposed, the minimum clear workspace shall not be less than 6 feet 6 inches (1.98 m) high (measured vertically from the floor or platform), or less than 3 feet (914 mm) wide (measured parallel to the equipment). In electric equipment rooms, the illumination may not be controlled by automatic means only. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. This receptacle shall be located not more than 1.98 m (6.5 ft) above the floor, platform, or grade level serving the pool. This Live Performance Safety Guideline highlights sections of the OESC that apply to the temporary and innovative nature of the live performance industry. Motors and appliances. The disconnecting means shall be within sight of the equipment served. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. for information on the final rule. All temporary lamps for general illumination shall be protected from accidental breakage by a suitable fixture or lampholder with a guard. Enclosure for electrical installations. Entrance and access to workspace. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. Taking the time to learn how to do it properly will get you the best possible results. Disconnecting Means. 5. Unused openings in boxes, raceways, auxiliary gutters, cabinets, equipment cases, or housings shall be effectively closed to afford protection substantially equivalent to the wall of the equipment. February 7, 1996 The following requirements apply to industrial and commercial laboratory equipment. Electrical installations in a vault, room, closet or in an area surrounded by a wall, screen, or fence, access to which is controlled by lock and key or other equivalent means, are considered to be accessible to qualified persons only. 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. Location. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. Examination, installation, and use of equipment -. 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. 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. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. Removable links or removable conductors may be used as the disconnecting means. The width of Panel or 0.762 Meter which is Greater. In general, any electrical panel that has 0 to 150 volts going through it needs to have at least 36 of clearance around it. A warning sign worded as required in paragraph (c)(8) of this section shall be mounted on or next to the disconnecting means where interconnections between controllers are necessary for the operation of the system on multicar installations that remain energized from a source other than the one disconnected. Arcing parts. Examination, installation, and use of equipment -. 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. 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. 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. 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. Electrically driven or controlled irrigation machines -. Mr. William Overby Classification by type, size, voltage, current capacity, specific use. 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. Suitable enclosures or guards must be provided to prevent damage to this 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3.