Egress and working space for rooms containing electrical overcurrent devices, switching devices, or control devices shall be in compliance with the International Fire Code and Section of NFPA 70 Background 15 IFC 6053 Working space and clearance A working space ofnot less than 30 inches (762 mm) in width, 36 The 14 edition of the NEC was approved as an American National Standard on Aug 21, 13, and supersedes all previous editions Because a strong understanding of the NEC is a cornerstone of any safe electrical design, this article will focus on some of the more significant changes proposed and accepted in this code cycleIn the NEC, working space requirements are found primarily in Article 110 NEC applies to electrical equipment operating at 600 volts or less The primary requirement is that both access and working space must be provided and maintained for all electrical equipment (Photo 1)
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Nec 110.26 working space
Nec 110.26 working space-As outlined in NEC Table (A),these are Condition 1 When there are (i) exposed live parts on only one side of the working space, (ii) grounded live parts on the other side of the working space, or (iii) when both sides of the working space are sufficiently insulated Requires 3 8 ft depending on voltage from 1001V to above 75 kV Working space for equipment shall be provided and maintained per subsection (A) to permit ready and safe operation of such equipment The placement of bollards within working space, even if they are removable is prohibited, since they don't permit ready access to
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2) a 30 in wide working space in front of equipment operating at 600V or less;NEC (A)(3), (E) (e) The access and work space shall not be used for storage NEC (B) 3 Outdoor/Water/Moisture – Service Equipment and SubPanels shall not be located where subject to water or moisture on a regular basis or in large quantities, ie where exposed to lawn sprinklers or below a roof scupper NEC (F) 4The wording of the article (and the commentary in the NEC Handbook) definitely seems to suggest that vfd's require working space However, the electrical inspector is allowing them to be buried behind the motors and pumps
The clear working space that is required by the first sentence as described in (A) may be eliminated only where examination, adjustment, servicing and maintenance are not "likely" to occur when energized exposed live parts, etc, are present" , 0549 PM #2 Workspace If equipment may require examination, adjustment, servicing, or maintenance while energized, you must install it in a workspace in accordance with items (1), (2), and (3) of (A) The phrase "while energized" is the root of many debates Code Violation NEC (A) 3 Height of Working Space Has to be 65 feet minimum or at least as high as the equipment "The work space shall be clear and extend from the grade, floor, or platform to a height of m (61/2 ft) or the height of the equipment" NATIONAL ELECTRICAL CODE, 14 Edition
Answer No The National Electrical Code Section (A) Working Space states in part, "Working space for equipment operating at 600 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized " Transformers are not meant to be worked on while energized, therefore the work of the National Electrical Code (NEC) 1) at least a 3ft clearance in front of all electrical equipment;Spaces about Electrical Equipment Access and working space shall be provided and maintained about all electrical equipment to permit ready and safe operation and maintenance of such equipment (1) Depth of Working Space The depth of the working space in the direction of live parts shall not be less than
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NEC (A) (2) states that "the width of the working space in front of the electrical equipment shall be the width of the equipment or 762 mm (30 in), whichever is greater" In addition, this work space shall permit at least a 90degree opening of the panelboard doorArticle (A)(2) Specifies that the width of the working space in front of the electrical equipment shall be the width of the equipment or 30 in (762 mm), whichever is greater The goal, obviously, is to prevent a worker from being unduly crowded when testing or maintaining equipment The width of the working space is a factor Only qualified electricians are permitted to perform maintenance work NEC article (A) ( 1) condition 3 states that exposed live parts on both sides of the working space require minimum clear distance of 4ft NEC does not explain the dead front panel working space requirements between panels
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Width of working space around electrical equipment NEC (A) (2) Working space around electrical equipment must be as wide as the equipment or 30 inches, whichever is greater Height of working space around electrical equipment NEC (A) (3) For installations built before , the height of the working space must be 625 ft Also, storage is not allowed in the required working space, per NEC (B), the panel door must swing open a minimum of 90º, per NEC (A)(2), a panel cannot be located in a clothes closet, bathroom, or on stairs, per NEC (D,E,F), and the area in front of the panel must be illuminated, per (D)NEC Requires access and working space be provided about all electrical equipment to permit ready and safe operation and maintenance of such equipment Our current staff consensus and State historical position is that a removable barrier meets the intent of the requirement in NEC
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Does (A) apply to variable frequency drives controlling hvac related pumps?Article (A)(2)—Specifies that the width of the working space in front of the electrical equipment shall be the width of the equipment or 30 inches (762 mm), whichever is greater The goal is to prevent a worker from being unduly crowded when testing or maintaining equipment The width of the working space is a factor regarding worker(3) Personnel Doors Where equipment rated 10 A or more that contains overcurrent devices, switching devices, or control devices is installed and there is a personnel door (s) intended for entrance to and egress from the working space less than 76 m (25 ft) from the nearest edge of the working space, the door (s) shall open in the
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1
Analysis Section (A) (3) describes the height of the working space and allows for electrical equipment to intrude into the working space for a maximum depth of 6" This can often be seen in equipment rooms that have a wireway protruding outward above or below a panelboardHowever, the language in and (A) needs special evaluation and careful consideration when working on NEC requires working clearance in front of equipment likely to require calibration, testing, or adjustment while energized This means a 30 by 36 inch space (or larger) in front of panels, access panels on HVAC equipment and fused disconnects Does this requirement extend to non
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The working space is defined in all three dimensions depth, width, and height Some of the working space requirements found in Section (NEC05) include (A) Working Space Working space for equipment operating at 600 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance whileVisit http//wwwMikeHoltcom/14code to explore Mike's complete range of 14 NEC training products For over 35 years Mike Holt Enterprises has specializedListen to this PODCAST where Paul Abernathy walks you through all the Working Space and Dedicated Equipment Space Requirements for the National E
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That is, some of the requirements are applicable only where the equipment "is likely to require examination, adjustment, servicing, or maintenance while energized" (A) Working SpaceNEC Table (A) (1) provides the minimum required work space depth for electrical equipment rated volts (to ground) that is likely to be examined or worked on while energized(b) Work Space The working clearance space shall include the zone described in (A) No architectural appurtenance or other equipment shall be located in this zone Exception Structural overhangs or roof extensions shall be permitted in this zone (c) Dedicated Equipment Space The space equal to the width and depth of the equipment, and
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If it is not likely to require examination, adjustment, servicing, or maintenance while energized then (A) 1, 2 and 3 do not apply The mechanical code would require working space on the service side of the equipment but I don't see the disconnect as meeting any of the needs described If you have a room that meets the above requirements, (2) states that these electrical rooms must have an entrance/egress that is at least 24 inches wide and 65 feet tall at EACH end of the working space Working space requirements appear in Table (A) (1) Another addition appearing in here is that the equipment doorsIndustrial control panels (NEC For the depth of the working space we will again refer to Table (A)(1) and base it on the voltage to ground and the conditions specified to determine the distance required, and all enclosure doors or hinged panels must be able to open at least 90 degrees The last
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And 3) minimum headroom clearance of 6 ft or theEXHIBIT The two distinct indoor installation spaces the working space and the dedicated electrical space EXHIBIT Illustrates the working space in front of the panelboard by (A) No equipment, electrical or otherwise, is allowed in the working space EXHIBIT The working space in front of a panelboardCalculations for service equipment (NEC );
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4051 Working Space and Clearances Access and working space shall be provided and maintained around all electrical equipment to permit ready and safe operation and maintenance of such equipment in accordance with this section and Figure 4051 () For SI 1 inch = 254 mm, 1 foot = 3048 mm Equipment, piping and ducts foreign to theWork Space and Guarding The requirements of are conditional, just like the requirements in ; #1 There are some changes in the 17 National Electrical Code with regard to rooms that require doors to have panic hardware or fire exit hardware Since the NEC is not one of the codes I spend a lot of time reading, I'm hoping y'all can help me confirm whether I'm interpreting this correctly (or not) Previous Edition
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I can post the entire NEC (A) if you would like, but referring to (A) should be sufficient as they need to read the applicable sections in (A) themselves (A)(1) and Table (A)(1) addresses the minimum depth of the working space For example, minimum NEC workspace clearances would allow 1000Vdc inverters to be mounted on a wall with no space between them (provided the enclosure door opens 90 degrees), and there is sufficient width (30") to stand in front in the equipment, sufficient headroom (61/2'), and sufficient depth of working space (between 3' and 5 Greetings Mr Design Engineer, Thank you for submitting your question with regards to the proper application of section (2)(a) as it pertains to establishing a compliant and safe single entrance to and egress from large electrical equipment rated 10 amps or more and over 6 feet wide that contain overcurrent devices, or control devices, or switching devices
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Table (A)(1) Working Space VoltagetoGround Condition 1 Condition 2 Condition 3 0–150V 3 ft 3 ft 3 ft 151–600V 3 ft 3½ft 4 ft • Condition 1—Exposed live parts on one side of the working space and no live or grounded parts, including concrete, brick, or tile walls are on the other side of the working spaceProvide sufficient working spaces and clearances for batteries Working space shall be measured from the edge of the battery cabinet, racks, or trays, (NEC 4809, ) Spaces about the ESS shall comply with NEC Working space shall be measured from the edge of the ESS modules, battery cabinets, racks, or trays, (NEC )The requirements in (A) (1) through (A) (3) of the National Electrical Code (NEC) deal with Code prescribed "working space" at electrical equipment—requirements that in most instances are considered by designers, installers and inspectors as eyeball situations;
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110 26 C 2 Large Equipment
(f)(1)(a) The dedicated space above equipment is now defined as a space extending from the floor to a height of 6 feet above the equipment or to the structural ceiling whichever is lowerNo piping, ducts, or equipment foreign to the electrical installation shall be installed in this spaceIn the 1999 National Electrical Code (NEC), Section , Spaces About Electrical Equipment, consists of 1996 Section plus Subsection (f), Dedicated Equipment Space, relocated from 1996 Section 3844 " (f) Dedicated Equipment Space The minimum width of the working space is 30 in or the width of the equipment, whichever is greater, and all doors or panels must be able to open to 90 degrees or more This is the same as the general requirement found in (A) (2)
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Reference National Electrical Code (NEC) Table (A)(1)) Condition 1—Exposed live parts on one side of the working space and no live or grounded parts, including concrete, brick, or tile walls are on the other side of the working spaceAuthor's Comment The working space requirements of don't apply to equipment included in Chapter 8— Communications Circuits 903 (2) Width of Working Space The width of the working space must be a minimum of 30 in, but in no case less than the width of the equipment
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