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. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. There would be no additional need to deenergize circuits for other equipment to deenergize a motor and its controller disconnected by an individual disconnecting means which meets paragraph 1910.305(j)(4) requirements. This letter constitutes OSHA's interpretation of the requirements discussed. 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. They bring all the electrical lines into one centralized location so that the main power source can feed them. All fluidizing lines-would have to be purged in order to prevent plugging of the line. other equipment foreign to the electrical installation shall be located in . Exposed conductive surfaces, such as electric equipment housings, cabinets, boxes, motors, raceways and the like that are within the cell line working zone. Where bare energized parts at any voltage or insulated energized parts above 600 volts are located adjacent to such entrance, they shall be guarded. All electrical conductors and equipment shall be approved. Your scenario and questions, and our replies, follow. OSHA Requirements for Electrical Panel Floor Markings 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. In order to remain in compliance with the relevant regulations, you cannot put anything in the space around an electrical panel. Pan 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. 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). For serious, other-than-serious, and posting requirement violations, OSHA issues a fine amount of $14,502 per violation. The following equipment connected to the same source shall be bonded: Metal enclosures of electrical equipment; and. However, other equipment associated with the electrical installation and located above or below the electric equipment may extend not more than 153 mm (6 in.) Identification of disconnecting means and circuits. A disconnecting means shall be provided in the supply circuit. Receptacles and their mating plugs for ungrounded equipment may not have provision for a grounding conductor and shall be of a configuration that prevents their use for equipment required to be grounded. 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. Table S-1 - Minimum Depth of Clear Working Space at Electric Equipment, 600 V or Less. Conductors shall be spliced or joined with splicing devices identified for the use or by brazing, welding, or soldering with a fusible metal or alloy. Cooling. 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. Note that our enforcement guidance may be affected by changes to OSHA rules. For indoor installation, the dedicated space shall comply with the following: The space equal to the width and depth of the equipment and extending from the floor to a height of 1.83 m (6.0 ft) above the equipment or to the structural ceiling, whichever is lower, shall be dedicated to the electrical installation. The portion of an overhead crane or hoist that contacts an energized electrolytic cell or energized attachments shall be insulated from ground. Amusement rides or attractions may not be located under or within 4.57 m (15 ft) horizontally of conductors operating in excess of 600 volts. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. The following hazards are the most frequent causes of electrical injuries: contact with power lines, lack of ground-fault protection, path to ground missing or discontinuous, equipment not used in manner prescribed, and improper use of extension and flexible cords. Working space required by this standard may not be used for storage. Clearance is the shortest distance between two conductive parts Dry arcing distance (or arc distance) The markings required by paragraphs (f)(1) and (f)(2) of this section shall be of sufficient durability to withstand the environment involved. This set of code identifies how much clearance is needed around any type of electrical panel based on a number of different factors. 2. Arcing parts. Electrically driven or controlled irrigation machines -. 0.9 Meter (3 Ft) Clearance When Facing Other Electrical Panels <480V. Suitability of equipment for an identified purpose may be evidenced by listing, labeling, or certification for that identified purpose. In addition, from time to time we update our guidance in response to new information. Driving machines or motion and operation controllers not within sight of the disconnecting means shall be provided with a manually operated switch installed in the control circuit adjacent to the equipment in order to prevent starting. A worker has to be qualified, trained and can demonstrate skills, while exposed to electrical hazards. Lighting fixtures, lighting outlets, and ceiling suspended (paddle) fans. 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. Clearance. 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 doors are used giving access to voltages from 500 to 1000 volts ac or dc, either door locks shall be provided or interlocks shall be installed. July 26, 2004 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. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. Ladder clearance Disconnecting means. 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.) 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. Engineers, electricians, and other professionals work with electricity directly, including working on overhead lines, cable harnesses, and circuit assemblies. The sign shall be clearly legible and shall read WARNING - PARTS OF THE CONTROLLER ARE NOT DEENERGIZED BY THIS SWITCH.. The OSHA training requirements for electrical safety. Switches operated by foot pressure shall be provided with a shield over the contact button to avoid accidental closing of the switch. This paragraph applies to electric wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools and fountains; hydro-massage bathtubs, whether permanently installed or storable; and metallic auxiliary equipment, such as pumps, filters, and similar equipment. OSHA requirements are set by statute, standards and regulations. Where controls are enclosed in cabinets, the doors shall either open at least 90 degrees or be removable. wide and 1.98 m (6.5 ft) high at each end of the working space, except that: Where the location permits a continuous and unobstructed way of exit travel, one means of exit is permitted; or. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Condition B - Exposed live parts on one side and grounded parts on the other side. 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. 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. 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. All Rights Re However, No. 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. Elevators, dumbwaiters, escalators, moving walks, wheelchair lifts, and stairway chair lifts. 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. 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. 10 or smaller conductors may be connected by means of wire binding screws or studs and nuts having upturned lugs or equivalent. Hundreds of motors would be shutoff. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. 7. Cord- and plug-connected equipment. If equipment is exposed to physical damage from vehicular traffic, guards shall be provided to prevent such damage. Walls constructed of concrete, brick, or tile are considered to be grounded surfaces. The 480 volt load circuits are deenergized, but the 110 volt control circuits must remain energized for the following reasons: Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. 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. 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. The disconnecting means shall be readily accessible to the operator, including when the ride is in operation. The disconnecting means shall be within sight of the sign or outline lighting system that it controls. 1910.306 - Specific purpose equipment and installations. A variety of possible solutions may be implemented to reduce or eliminate the risk of injury associated with electrical work. A box or fitting shall be installed at each connection point, outlet, switch point, or junction point. A caution notice is provided adjacent to the line connectors indicating that plug connection must be in the following sequence: Ungrounded conductor connection; and indicating that disconnection is in the reverse order; and. Thank you for your interest in occupational safety and health. Condition C - Exposed live parts on both sides of the work space (not guarded as provided in Condition A) with the operator between. These markings can include floor marking tape, floor signs, and labels. 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. 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. It shall also be protected by a ground-fault circuit interrupter installed in the branch circuit supplying the fixture. 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