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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Electrical Panel Equipment Working Space Clearance Distances U S Nec Article 110 26
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
Working Space Requirements For Electrical Panelboards Iaei Magazine
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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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