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Category: IEEE Stanard

  • IEEE C2-2023 

    1. Switchgear assemblies
      A. General requirements for all switchgear
    2. To minimize movement, all switchgear shall be secured in a manner consistent with conditions
      of service and applicable manufacturer’s instructions.
    3. Cable routed to switchgear shall be supported to minimize forces applied to conductor
      terminals.
    4. Piping containing liquids, or corrosive or hazardous gases, shall not be routed in the vicinity of
      switchgear unless suitable barriers are installed to protect the switchgear from damage in the
      event of a pipe failure.
    5. Switchgear shall not be located where foreign flammable or corrosive gases or liquids routinely
      and normally are discharged. Companion equipment such as transformers and switchgear are
      not considered foreign.
    6. Switchgear should not be installed in a location that is still specifically under active
      construction, especially where welding and burning are required directly overhead. Special
      precautions should be observed to minimize impingement of slag, metal filings, moisture, dust,
      or hot particles.
      EXCEPTION: Switchgear may be installed in a general construction area if suitable temporary protection
      is provided to minimize the risks associated with general construction activities.
    7. Precautions shall be taken to protect energized switchgear from damage when maintenance is
      performed in the area.
    8. Switchgear enclosure surfaces shall not be used as physical support for any item unless
      specifically designed for that purpose.
    9. Enclosure interiors shall not be used as storage areas unless specifically designed for that
      purpose.
    10. Metal instrument cases shall be effectively grounded and enclosed in covers that are metal and
      effectively grounded, or are of insulating material.
      B. Metal-enclosed power switchgear
    11. Switchgear shall not be located within 25 ft (7.6 m) horizontally indoors or 10 ft (3.0 m)
      outdoors of storage containers, vessels, utilization equipment, or devices containing flammable
      liquids or gases.
      EXCEPTION: If an intervening barrier, designed to mitigate the potential effects of flammable liquids or
      gases, is installed, the distances listed above do not apply.
      NOTE: Rule 180B1 is not intended to apply to the power transformer(s) supplying the switchgear.
    12. Enclosed switchgear rooms shall have at least two means of egress, one at each extreme of the
      area, not necessarily in opposite walls. Doors shall swing out and be equipped with panic bars,
      pressure plates, or other devices that are normally latched but open under simple pressure.
      EXCEPTION: One door may be used when required by physical limitations if means are provided for
      unhampered exit during emergencies.
    13. Space shall be maintained in front of switchgear to allow breakers to be removed and turned
      without obstruction.
    14. Space shall be maintained in the rear of the switchgear to allow for door opening to at least
      90 degrees open, or a minimum of 3 ft (900 mm) without obstruction when removable panels
      are used.
    15. Permanently mounted devices, panelboards, etc., located on the walls shall not encroach on the
      space requirements in Rule 180B4.
      180 180B5
      Part 1: Safety Rules for Electric Supply Stations
    16. 69
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    18. 6. Where columns extend into the room beyond the wall surface, the face of the column shall not
    19. encroach on the space requirements in Rule 180B4.
    20. 7. Low-voltage cables or conductors, except those to be connected to equipment within the
    21. compartments rated greater than 1000 V, shall not be routed through the divisions of
    22. switchgear unless installed in rigid metal duct, conduit or isolated by rigid metal barriers.
    23. 8. Low-voltage conductors routed from sections rated greater than 1000 V of switchgear shall
    24. terminate in a low-voltage section before being routed external to the switchgear.
    25. 9. Conductors entering switchgear shall be insulated for the highest operating voltage in that
    26. compartment or be separated from insulated conductors of other voltage ratings.
    27. 10. Switchgear enclosures shall be suitable for the environment in which they are installed.
    28. 11. A safety sign shall be placed in each cubicle containing more than one source (greater than
    29. 1000 V).
    30. NOTE: ANSI Z535.1-2011, ANSI Z535.2-2011, ANSI Z535.3-2011, ANSI Z535.4-2011, and ANSI
    31. Z535.5-2011 contain information regarding safety signs.
    32. 12. The location of control devices shall be readily accessible to personnel. Instruments, relays, and
    33. other devices requiring reading or adjustments should be so placed that work can readily be
    34. performed from the working space.
    35. C. Dead-front power switchboards
    36. Dead-front power switchboards with uninsulated rear connections shall be installed in rooms or
    37. spaces that are capable of being locked, with access limited to qualified personnel.
    38. D. Motor control centers
    39. Motor control centers shall not be connected to systems having higher short-circuit capability
      than the bus bracing can withstand. Where current-limiting fuses are employed on the source
      side of the bus, the bus bracing and breaker-interrupting rating are determined by the peak