Condition B - Exposed live parts on one side and grounded parts on the other side. 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. The specific electrical panel clearance requirements will depend on what area you are looking at, and how much voltage there is going through the panel. Identified Replacement Component Required.. 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. Induction and dielectric heating equipment. Exposed live parts on one side and grounded parts on the other side. These markings shall be of sufficient durability to withstand the environment involved. horizontally shall be provided. 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. 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. For installations other than equipment described in paragraph (h)(2)(v) of this section, a wall, screen, or fence shall be used to enclose an outdoor electrical installation to deter access by persons who are not qualified. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. The disconnecting means shall be capable of being locked in the open position. The conductors and equipment required or permitted by this subpart shall be acceptable only if approved, as defined in 1910.399. 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 could be literally hundreds of machines. The conductive surfaces of cranes and hoists that enter the cell line working zone need not be grounded. They also Secondly, installation can be tricky if one switches from an electric unit to a hybrid gas water heater or vice versa because of the required retrofitting. 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. 0.9 Meter. Group 1. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. 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. 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. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 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. 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. Working with electricity can be dangerous. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. Directorate of Enforcement Programs 0.9 Meter (3 Ft) Clearance When Facing Other Electrical Panels <480V. Location. 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. The disconnecting means shall be located where it is readily accessible to qualified persons. 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. 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. 600 Volts, nominal, or less. [This document was amended on October 24, 2012 to strike information that no longer reflects current OSHA policy.] 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. beyond the front of the electric equipment. Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of 30 inches (762 mm) horizontally shall be provided. Another safety focused agency is the National Fire Protection Association, or NFPA. Auxiliary nonelectrical connections. Application. Clear spaces. Examination. 3. John B. In addition, from time to time we update our guidance in response to new information. Ladder clearance 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. OSHA standards are sets of guidelines and requirements enforced by the Occupational Safety and Health Administration (OSHA) to minimize health and safety risks in US-based workplaces. Closely following the new requirements in the 2002 NEC for motor disconnect locations will help make safety a reality. 2023 Electrical Safety Expert | All Rights Reserved, NEC + OSHA Electrical Panel Clearance Requirements, Understanding NEC Panel Clearance Requirements, OSHA Electrical Panel Clearance Requirements. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. Boxes shall be designed so that no live parts are exposed to accidental contact. Fortunately, the OSHA electrical panel clearance requirements are taken directly from the NEC. Where bare energized parts at any voltage or insulated energized parts above 600 volts are located adjacent to such entrance, they shall be guarded. Each sign and outline lighting system, or feeder circuit or branch circuit supplying a sign or outline lighting system, shall be controlled by an externally operable switch or circuit breaker that will open all ungrounded conductors. Additional lighting fixtures are not required where the working space is illuminated by an adjacent light source. Requirements for working clearances and spaces around electrical equipment, e.g., ladder cable trays. Dear Mr. Schuldt: 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 The employer shall ensure that electrical equipment is free from recognized hazards that are likely to cause death or serious physical harm to employees. The NFPA is focused largely on reducing the risk of fires from occurring so that everyone can remain safe. This letter constitutes OSHA's interpretation of the requirements discussed. The OSHA training requirements for electrical safety. Some facilities will simply place the tape in a square around the panel to show the necessary distance that needs to be kept clear. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. Removable links or removable conductors may be used as the disconnecting means. Doors or covers giving access to uninsulated parts of indoor signs or outline lighting exceeding 600 volts and accessible to other than qualified persons shall either be provided with interlock switches to disconnect the primary circuit or shall be so fastened that the use of other than ordinary tools will be necessary to open them. This NEC working clearance will provide not only the person working on the equipment with room, but also their tools. 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. Your question has been restated below for clarity. Cord connectors may not be laid on the ground unless listed for wet locations. horizontally shall be provided. 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 . 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. The disconnecting means shall open all ungrounded conductors simultaneously and shall be: Disconnecting means for cranes and monorail hoists. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. Having an electrical panel clearance policy in place is very important not only for practical reasons, but also in order to comply with various regulations. Voltage testing should follow lock out/tag out. No provision may be made to open or close this disconnecting means from any other part of the premises. What Constitutes Clearance Around Electrical Panels? The following requirements apply to indoor installations that are accessible to other than qualified persons: The installations shall be made with metal-enclosed equipment or shall be enclosed in a vault or in an area to which access is controlled by a lock; Metal-enclosed switchgear, unit substations, transformers, pull boxes, connection boxes, and other similar associated equipment shall be marked with appropriate caution signs; and. Busbar connectors shall be provided where conductors terminate directly on busbars; Receptacles shall have overcurrent protection installed within the box. 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. Installations accessible to unqualified persons. This letter constitutes OSHA's interpretation of the requirements discussed. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. Durability of markings. 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. 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. A disconnecting means shall be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. All fluidizing lines-would have to be purged in order to prevent plugging of the line. Richard E. Fairfax, Director Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. Application for variances are covered under 29 CFR Part 1905. 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. 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. Since the top of the panelboard is more than 6 1 / 2 feet above the floor, the minimum working space height required for this panelboard is the height of the panelboard. One of the most common questions people have when setting standards in a facility for electrical panel clearance requirements is what OSHA says. Services, feeders, and branch circuits. 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. Cranes and hoists. Lightning protection. When the system is put back into production there is a chance of many more hazards developing that would have to be addressed. Open conductors are prohibited except as part of a listed assembly or festoon lighting installed in accordance with 1910.304(c). Equipment installed underwater shall be identified for the purpose. If anything is found in a spot that is too close to the panel, the items can be moved right away. When employees are trained to work safely, through the requirements, they should be able to anticipate and avoid injury from job related hazards. 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