osha electrical disconnect clearance requirements

Safety electrical work practices; motor disconnects;work clearances. Resistance welders. Interconnection between multicar controllers. A disconnecting means shall be provided in the supply circuit. The points of control shall be so located that persons are not likely to come in contact with any live part or moving part of the equipment while turning on the lights. 5. Connectors and cable connections may not be placed in audience traffic paths or within areas accessible to the public unless guarded. Electrical installations that are open to unqualified persons shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area, access to which is controlled by a lock. Portable distribution and termination boxes. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. In electric equipment rooms, the illumination may not be controlled by automatic means only. Per the NEC, 30" wide by 36" front to back by 6.5' vertical clearance. 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. OSHA Requirements for Electrical Panel Floor Markings Unless isolated from equipment by height or physical enclosures or covers that will afford adequate mechanical protection from vehicular traffic or accidental contact by unauthorized personnel or that complies with paragraph (g)(1)(vii)(A)(2) of this section, piping, ducts, or equipment foreign to the electrical installation may not be located in this area; The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to avoid damage from condensation, leaks, or breaks in such foreign systems. 3. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be as follows: For installations built before August 13, 2007, 1.91 m (6.25 ft); and. By elevation of 8 feet (2.44 m) or more above the floor or other working surface and so installed as to exclude unqualified persons. The top of the disconnect switch is only 72 inches (6 feet) above the floor. 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). A disconnecting means shall be provided between the runway contact conductors and the power supply. [46 FR 4056, Jan. 16, 1981, as amended at 73 FR 64205, Oct. 29, 2008], Occupational Safety & Health Administration. 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. 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. Defiance, Ohio 43512 Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. Electrical wiring for temporary lighting, where installed inside of tents and concessions, shall be securely installed, and, where subject to physical damage, shall be provided with mechanical protection. Also, from time to time we update our guidance in response to new information. 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. Signs or outline lighting systems operated by electronic or electromechanical controllers located external to the sign or outline lighting system may have a disconnecting means located within sight of the controller or in the same enclosure with the controller. The disconnecting means shall be operable from a location readily accessible from the X-ray control. Working space about electric equipment. Requesting clearance should be the first step. 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. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Standard Number: 1910.179 OSHA requirements are set by statute, standards and regulations. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. 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. In addition, from time to time we update our guidance in response to new information. Sincerely, Electric 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. They are respected around the world and many countries follow their recommendations when creating their own rules and regulations. Examination, installation, and use of equipment -. This means if you have an inspection, you can count on the fact that the OSHA electrical panel clearance will be measured by the OSHA inspector to make sure that you are in compliance. Where installed outdoors, the box shall be of weatherproof construction and mounted so that the bottom of the enclosure is not less than 152 mm (6 in.) Disconnecting Means. 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. Control power is off on a large number of machines. Completed wiring installations shall be free from short circuits and from grounds other than those required or permitted by this subpart. 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. 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. Approval. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. 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. Your question has been restated below for clarity. The electric panel door must be able to open to a 90-degree angle. Keep the fire inside the fireplace. 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. Working space for equipment likely to require examination, adjustment, servicing, or maintenance while energized shall comply with the following dimensions, except as required or permitted elsewhere in this subpart: The depth of the working space in the direction of access to live parts may not be less than indicated in Table S-1. Unfortunately, it is often difficult for people to remember exactly how much distance from a panel things can be. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. Mounting. Your safety manager or other designated individual should have a list of where all the electrical panels in the facility are located. One of the main things that the NEC 110.26 specifies is that all electrical panels must have enough room around them that someone working on the equipment will have the room to safely access everything they need. The relevant section of the national electric code here is NEC 110.26. The Ontario Electrical Safety Code ( OESC) deals in detail with permanent and temporary theatrical electrical installations. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). 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. This paragraph applies to electric equipment operating at 600 volts, nominal, or less to ground. 61, which is incorporated by reference as specified in Sec. Note to paragraph (g)(1)(vii)(A) of this section:A dropped, suspended, or similar ceiling that does not add strength to the building structure is not considered a structural ceiling. If fixed electric equipment is mounted on an energized conductive surface, it shall be bonded to that surface. You must also have a 120vac 15 amp service outlet within 25ft. If you have any further questions, please feel free to contact the Office of General Industry Enforcement at (202) 693-1850. All electrical conductors and equipment shall be approved. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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). 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. 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 insulating materials. Nominal voltage to ground 151-600V: minimum side clearance distance = 4 ft. (1.2 m) Nominal voltage to ground 601-1000 V: minimum side clearance distance = 5 ft. (1.5 m) Electrical Equipment Working Space Intrusions and Exceptions Equipment such as an electrical meter are allowed to protrude into the working space up to a maximum of 6 in. The disconnecting means shall be capable of being locked in the open position. Dedicated space: The space equal to the width and depth of electrical equipment in addition to the space extending from the floor to 6 feet . 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. for information on the final rule. Placed within view of the runway contact conductors. This paragraph applies to X-ray equipment. 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. Clearance distance helps prevent dielectric breakdown between electrodes caused by the ionization of air. Induction heating coils shall be protected by insulation or refractory materials or both. 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. Dayton, Ohio 45420 Question 1: Paragraph 1910.333(a)(1) requires that live parts to which an employee may be exposed must be deenergized before the employee works on or near them, unless the employee can demonstrate that deenergizing introduces additional or increased hazards or is infeasible due to equipment design or operational limitations. 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. In previous NEC editions, transformers didn't require a disconnecting means. 110-26 of the National Electrical Code (NEC): 1) at least a 3-ft clearance in front of all electrical equipment; 2) a 30 in.-wide working space in front of equipment operating at 600V or less; and 3) minimum headroom clearance of 6 ft or the height of the . Services shall be installed in accordance with applicable requirements of this subpart, and, in addition, shall comply with the following: Service equipment may not be installed in a location that is accessible to unqualified persons, unless the equipment is lockable; and. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." It shall be designed so no pole can be operated independently and shall be capable of being locked in the open position. Distances shall be measured from the live parts, if they are exposed, or from the enclosure front or opening, if they are enclosed. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Sincerely, Installations accessible to unqualified persons. The converting apparatus (including the dc line) and high-frequency electric circuits (excluding the output circuits and remote-control circuits) shall be completely contained within enclosures of noncombustible material. Since electrical fires are one of the biggest risks that a facility can face, it should come as no surprise to find that the NFPA has requirements in this area. This paragraph covers the installation of portable wiring and equipment, including wiring in or on all structures, for carnivals, circuses, exhibitions, fairs, traveling attractions, and similar events. The disconnecting means shall be within sight of the equipment served. When looking into electrical panel clearance safety, you need to start by looking at the requirements put in place by the national electric code, or NEC. 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. Disconnecting means for runway conductors. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. This letter constitutes OSHA's interpretation of the requirements discussed. 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. Each disconnecting means required by this subpart for motors and appliances shall be legibly marked to indicate its purpose, unless located and arranged so the purpose is evident. Listed, labeled, or certified equipment shall be installed and used in accordance with instructions included in the listing, labeling, or certification. Conductors shall be racked to provide ready and safe access in underground and subsurface enclosures that persons enter for installation and maintenance. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table K-3. Pan Visit the Electric Power Generation, Transmission and Distribution Standard Page There should be at least three to three-and-a-half feet of clearance in front of all electrical disconnects and breaker panels. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. A variety of possible solutions may be implemented to reduce or eliminate the risk of injury associated with electrical work. Would deenergizing the 110 volt control circuit as described in the scenario above be considered infeasible as delineated in the aforementioned standard? In outdoor pool areas, lighting fixtures, lighting outlets, and ceiling-suspended (paddle) fans may not be installed over the pool or over the area extending 1.52 m (5 ft) horizontally from the inside walls of a pool unless no part of the lighting fixture of a ceiling-suspended (paddle) fan is less than 3.66 m (12 ft) above the maximum water level. Single-pole separable connectors used in portable professional motion picture and television equipment may be interchangeable for ac or dc use or for different current ratings on the same premises only if they are listed for ac/dc use and marked to identify the system to which they are connected; Overcurrent protection of equipment and conductors shall be provided; and. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. By location on a balcony, gallery, or platform so elevated and arranged as to exclude unqualified persons. 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. Lighting outlets and points of control. Deteriorating agents. One of the easiest and most effective ways to make sure that nobody places anything in the area around your electrical panels is to mark the area with floor marking tape. 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. What is the residential electrical panel clearance requirements? A switch or circuit breaker shall be provided by which each resistance welder and its control equipment can be disconnected from the supply circuit. 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. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. Low-Voltage Electrical Safety Orders (Sections 2299 - 2599) Group 2. Headroom. If switches, cutouts, or other equipment operating at 600 volts, nominal, or less, are installed in a room or enclosure where there are exposed live parts or exposed wiring operating at over 600 volts, nominal, the high-voltage equipment shall be effectively separated from the space occupied by the low-voltage equipment by a suitable partition, fence, or screen. Induction and dielectric heating equipment. 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. This paragraph applies to the installation of the electrical components and accessory equipment of electrolytic cells, electrolytic cell lines, and process power supply for the production of aluminum, cadmium, chlorine, copper, fluorine, hydrogen peroxide, magnesium, sodium, sodium chlorate, and zinc. Clear Height in front of Panel >480V. There shall also be a similar means to disconnect the power to all dedicated heating, ventilating, and air-conditioning (HVAC) systems serving the room and to cause all required fire/smoke dampers to close. beyond the front of the electric equipment. The width of Panel or 0.762 Meter which is Greater. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. A means shall be provided to disconnect power to all electronic equipment in an information technology equipment room. All electric equipment, including power supply cords, operating at more than 15 volts and used with fountains shall be protected by ground-fault circuit interrupters. Thank you for your interest in occupational safety and health. Dear Mr. Overby: Type. Electric equipment that depends on the natural circulation of air and convection principles for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment. The area must not only remain completely clear of items at all times, but it also needs to be accessible. We hope you find this information helpful. Flexible cords and cables shall be listed for extra-hard usage. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. Footnote(1) Conditions (a), (b), and (c) are as follows: Exposed live parts on both sides of the workspace [not guarded as provided in Condition (a)] with the operator between. Lightning protection. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably guarded. The provisions of paragraphs (j)(2), (j)(3), and (j)(4) of this section do not apply to equipment on the supply side of the service conductors. 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. Directorate of Compliance Programs, Occupational Safety & Health Administration, Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. 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. Eight (8) to ten (10) hours of start-up time could be required to re-load processing bins, fluidizing lines and processing transitions. Mr. John C. (Jack) Schuldt, Sr. When installing or updating an electrical panel, it is important to make sure that there is plenty of room around the panel for the electrician to safely work. 2. 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. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. ), whichever is greater. 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

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