wide and 1.98 m (6.5 ft) high shall be provided to give access to the working space about electric equipment. 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. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be guarded. By elevation of 2.44 m (8.0 ft) or more above the floor or other working surface. On elevators with generator field control, the disconnecting means shall be located within sight of the motor controller for the driving motor of the motor-generator set. 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. 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. Unguarded live parts above working space shall be maintained at elevations not less than specified in Table S-3. Entrance and access to workspace. If anything is found in a spot that is too close to the panel, the items can be moved right away. 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. Installations accessible to qualified persons only. Sincerely, The following requirements apply to the entrances to all buildings, rooms, or enclosures containing exposed live parts or exposed conductors operating at over 600 volts, nominal: The entrances shall be kept locked unless they are under the observation of a qualified person at all times; and. Note that our enforcement guidance may be affected by changes to OSHA rules. 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. Disconnecting means. Therapeutic pools in health care facilities are exempt from these provisions. OSHA's electrical standards are designed to protect employees exposed to dangers such as electric shock, electrocution, fires, and explosions. The depth shall be as required in Table K-2. This paragraph applies to the installation of electric equipment and wiring used in connection with cranes, monorail hoists, hoists, and all runways. 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. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] If the disconnect for a piece of HVAC equipment doesn't have any fuses, then can you make the argument the switch will not require maintenance so that 3' clearance isn't required? It is also easy to verify. 1Minimum depth of clear working space in front of electric equipment with a nominal voltage to ground above 25,000 volts may be the same as that for 25,000 volts under Conditions A, B, and C for installations built before April 16, 1981. Cord- and plug-connected equipment. Marking. 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. Where a pool is installed permanently at a dwelling unit, at least one 125-volt, 15- or 20-ampere receptacle on a general-purpose branch circuit shall be located a minimum of 3.05 m (10 ft) and not more than 6.08 m (20 ft) from the inside wall of the pool. Clear spaces. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. 1The minimum elevation may be 2.6 m (8.5 ft) for installations built before August 13, 2007. 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. 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. 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; By placement on a suitable balcony, gallery, or platform so elevated and otherwise located as to prevent access by unqualified persons; or. 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. Electrical is addressed in specific OSHA standards for general industry and maritime. Electrically driven or controlled irrigation machines -. What is the residential electrical panel clearance requirements? A new section, 450.14, requires a disconnecting means for most transformers. The use of single-pole separable connectors shall comply with at least one of the following conditions: Connection and disconnection of connectors are only possible where the supply connectors are interlocked to the source and it is not possible to connect or disconnect connectors when the supply is energized; or. This paragraph applies to equipment operating at 600 volts, nominal, or less. It is just as important to create your own set of policies and procedures to ensure that you are always in compliance with the various regulations. The disconnecting means shall be a switch or circuit breaker, and its rating may not be less than that necessary to accommodate overcurrent protection. See if you can "orient" the disconnect so as to have requisite clearance in front. 508 Carpenter Road If there is anything that would prevent this or make it more dangerous, the chances are that you are in violation of the regulations and could get cited for it during an inspection. Where one entrance to the working space is permitted under the conditions described in paragraph (h)(4)(i)(A) of this section, the entrance shall be located so that the edge of the entrance nearest the switchboards and control panels is at least the minimum clear distance given in Table S-2 away from such equipment. Also, from time to time we update our guidance in response to new information. Permanent ladders or stairways shall be provided to give safe access to the working space around electric equipment installed on platforms, balconies, mezzanine floors, or in attic or roof rooms or spaces. The disconnecting means shall be capable of being locked in the open position. Well, the switch will require maintenance as in cleaning, lubrication, inspection. Specific purpose equipment and installations. 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. High-Voltage Electrical Safety Orders (Sections 2700 - 2989) Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. 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. The following requirements apply to elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. The lighting outlets shall be arranged so that persons changing lamps or making repairs on the lighting system will not be endangered by live parts or other equipment. This is not only important for avoiding getting fined for violating the requirements, but also for ensuring your facility is as safe as possible. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. 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. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. The Ontario Electrical Safety Code ( OESC) deals in detail with permanent and temporary theatrical electrical installations. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. Here's a broad breakdown of space requirements when planning around electrical panels: 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. 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. 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. Assuming you meant "while energized": Disconnecting Means. Voltage testing should follow lock out/tag out. 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. Enclosure, 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. When used outdoors, flexible cords and cables shall also be listed for wet locations and shall be sunlight resistant. Keep the fire inside the fireplace. Protection shall be provided where necessary to avoid damage from condensation leaks and breaks in such foreign systems. Electrolytic cells. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. Clearance. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided; Heating effects under all conditions of use; Classification by type, size, voltage, current capacity, and specific use; and. A simple way to meet electrical panel clearance requirements is to use floor markings. Where rear access is required to work on the deenergized parts on the back of enclosed equipment, a minimum working space 762 mm (30 in.) Even in countries that do not have strict regulations when it comes to electrical panel clearance will often voluntarily choose to follow the recommendations found in NFPA 70e. July 26, 2004 The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. Auxiliary electric equipment, such as motors, transducers, sensors, control devices, and alarms, mounted on an electrolytic cell or other energized surface shall be connected to the premises wiring systems by any of the following means: Multiconductor hard usage or extra hard usage flexible cord; Wire or cable in suitable nonmetallic raceways or cable trays; or. According to the National Electric Code, any electrical panel with 0 to 150 volts should have 36 inches of clearance around it for both the person working on it and their tools. Limit switch. A wall, screen, or fence less than 8 feet (2.44 m) in height is not considered adequate to prevent access unless it has other features that provide a degree of isolation equivalent to an 8-foot (2.44-m) fence. 2932 Hazel Ave. 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. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6 feet of headroom space. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. 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. Durability of markings. 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. 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. 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. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. for information on the final rule. Doors or detachable panels shall be employed for internal access. Carnivals, circuses, fairs, and similar events. 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. Where the driving machine is located in a remote machinery space, a single disconnecting means for disconnecting all ungrounded main power supply conductors shall be provided and be capable of being locked in the open position. We hope you find this information helpful. These markings shall be of sufficient durability to withstand the environment involved. Enclosure for electrical installations. Interlock switches shall be connected in such a manner as to remove all power from the applicator when any one of the access doors or panels is open. Outdoor electric equipment shall be installed in suitable enclosures and shall be protected from accidental contact by unauthorized personnel, or by vehicular traffic, or by accidental spillage or leakage from piping systems. The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 6 feet 3 inches (1.91 m). 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. Breaker panels should be easily accessible and should never be blocked. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. Does it require maintenance while energized? At least one entrance of sufficient area shall be provided to give access to the working space about electric equipment. AC systems supplying fixed and portable electric equipment within the cell line working zone; and. In addition, enclosed please find a copy of 29 CFR 1910.303(g) and 1910.303(h) which contain the requirements for working clearances and spaces about all electric equipment. The overcurrent protective devices, the total impedance, the component short-circuit current ratings, and other characteristics of the circuit to be protected shall be selected and coordinated to permit the circuit protective devices used to clear a fault to do so without the occurrence of extensive damage to the electrical components of the circuit. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. A means shall be provided to disconnect power to all electronic equipment in an information technology equipment room. 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