Clear Height in front of Panel <480V. Entrances to rooms and other guarded locations containing exposed live parts shall be marked with conspicuous warning signs forbidding unqualified persons to enter. 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. Because this cabinet you saw is located near an exit door, let's first look at OSHA's general requirements for exit routes, emergency action plans and fire prevention plans [20 CFR 1910.37-39]. Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Circuit impedance and other characteristics. 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. 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. Directorate of Enforcement Programs 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. July 26, 2004 This receptacle shall be located not more than 1.98 m (6.5 ft) above the floor, platform, or grade level serving the pool. In locations where electric equipment is likely to be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. Control equipment that by its very nature or because of other requirements in this subpart must be adjacent to or within sight of its operating machinery is permitted in the dedicated space. . beyond the front of the electric equipment. A readily accessible disconnecting means shall be provided by which each heating equipment can be isolated from its supply circuit. Electrical Safety Orders. Parts of electric equipment which in ordinary operation produce arcs, sparks, flames, or molten metal shall be enclosed or separated and isolated from all combustible material. 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. If fixed electric equipment is mounted on an energized conductive surface, it shall be bonded to that surface. General. Once again, however, the NFPA 70e electrical panel clearance requirements will match those of the NEC and of OSHA. Cord- and plug-connected lighting fixtures installed within 4.88 m (16 ft) of the water surface of permanently installed pools; and. Footnote(2) NOTE: For SI units: one foot=0.3048 m. Elevation of unguarded live parts. 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. 3. 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. This means once you understand the NEC panel clearance requirements, you will also know those that OSHA puts forth. Other factors which contribute to the practical safeguarding of employees using or likely to come in contact with the equipment. Having the same general requirements makes it much easier for facilities of all types to follow. In addition, from time to time we update our guidance in response to new information. A lighting fixture facing upward shall have the lens adequately guarded to prevent contact by any person. The relevant section of the national electric code here is NEC 110.26. Electrical equipment shall not be used unless the manufacturer's name, trademark, or other descriptive marking by which the organization responsible for the product may be identified is placed on the equipment and unless other markings are provided giving voltage, current, wattage, or other ratings as necessary. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used. X-Ray equipment. The ampere rating of this disconnecting means may not be less than the nameplate current rating of the equipment. Front working space. Examination, installation, and use of equipment -. Approval. Splices. 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. 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. Our interpretations letters explain the requirements, and how they apply to particular circumstances, but they can not create additional employer obligations. Induction heating coils shall be protected by insulation or refractory materials or both. Metal frames and metal parts of rides, concessions, trailers, trucks, or other equipment that contain or support electrical equipment. The manufacturer's name and trademark, other marking giving voltage, current, wattage or other ratings as necessary." 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. 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. 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. Control. The workspace shall be adequate to permit at least a 90-degree opening of doors or hinged panels. Working with electricity can be dangerous. Installation and use. The safety-related work practices under paragraphs 1910.331 through 1910.335 are predicated on compliance with the aforementioned electrical installation requirements. The clearance around the electric panel must be at least 30 inches wide with 3 of front workspace clearance. 0.9 Meter (3 Ft) The width of the workingspace in front of the Panel. In locations where electric equipment would be exposed to physical damage, enclosures or guards shall be so arranged and of such strength as to prevent such damage. 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. The disconnecting means shall be readily accessible and capable of being locked in the open position. For equipment designed for floor mounting, clearance between top surfaces and adjacent surfaces shall be provided to dissipate rising warm air. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus 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). Control panels not located in the same space as the drive machine shall be located in cabinets with doors or panels capable of being locked closed. 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. Keep the fire inside the fireplace. Radiographic and fluoroscopic-type equipment shall be effectively enclosed or shall have interlocks that deenergize the equipment automatically to prevent ready access to live current-carrying parts. At least one entrance not less than 24 inches (610 mm) wide and 6 feet 6 inches (1.98 m) high shall be provided to give access to the working space about electric equipment. 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. 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. Equipment installed underwater shall be identified for the purpose. Lighting fixtures and lighting outlets installed in the area extending between 1.52 m (5 ft) and 3.05 m (10 ft) horizontally from the inside walls of a pool shall be protected by a ground-fault circuit interrupter unless installed 1.52 m (5 ft) above the maximum water level and rigidly attached to the structure adjacent to or enclosing the pool. Warning sign for multiple disconnecting means. What Constitutes Clearance Around Electrical Panels? For installations built on or after August 13, 2007, 1.98 m (6.5 ft), except that where the electrical equipment exceeds 1.98 m (6.5 ft) in height, the minimum headroom may not be less than the height of the equipment. 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 supply circuit disconnecting means is permitted as a heating equipment disconnecting means where the circuit supplies only one piece of equipment. Disconnecting means for runway conductors. 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. 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. 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. Installations covered by paragraph (h) of this section shall comply with all applicable provisions of this subpart, except as follows: Disconnecting means. Soldered splices shall first be spliced or joined to be mechanically and electrically secure without solder and then soldered. Flexible cords and cables shall be continuous without splice or tap between boxes or fittings. Marking. At least one entrance not less than 610 mm (24 in.) Disconnecting means. Although there were no documented injuries to warrant this change, it's obvious that this requirement should enhance safety. 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