UL 347
Medium-Voltage AC Contactors, Controllers, and Control Centers

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2016-01-29DOD Approved: --
Price Code:CANSI Approved: 2016-01-29
Type:ulcsance

  • SCOPE

    1.1 Scope and object

    This standard is applicable to ac contactors applied at voltages in the range of 1 501V to 15kV, and metal-enclosed contactor-based controllers, control centers, and other control assemblies and associated equipment applied at voltages in the range of 751V to 15kV, designed for operation at frequencies of 50 or 60 Hz on three-phase systems. These requirements cover equipment intended for use in ordinary (non-hazardous) locations and installed in accordance with the applicable local installation codes and standards (see Annex a, Item 1). These requirements, as modified by the applicable national standards for fire pump controllers, also cover fire pump controllers (see Annex a, Item 2).

    This standard also includes requirements for controllers intended for service entrance applications. (See 5.204 and Annex a, Item 3.)

    This standard does not cover:

    a) equipment for use in classified (hazardous) locations as defined in the applicable installation codes or standards;

    b) components contained in contactors and contactor-based controllers for which individual component standards exist; and

    c) auxiliary low voltage control assemblies (see Annex a, Item 4).

    This standard also includes requirements for reduced-voltage solid state controllers. It does not, however, cover equipment consisting solely of electronic or solid state devices, circuits, or systems, nor does it cover electronic variable speed motor controllers (power conversion equipment). This standard does not cover full-voltage controllers using only solid state devices in the main circuit.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • MEDIUM-VOLTAGE AC CONTACTORS, CONTROLLERS, AND CONTROL CENTERS
        • 1 General
          • 1.1 Scope and object
          • 1.2 Normative references, component standards, and general requirements
        • 2 Normal and Special Service Conditions
          • 2.1 Normal service conditions
          • 2.2 Special service conditions
        • 3 Definitions
          • 3.1 General terms
          • 3.2 Assemblies of controlgear
          • 3.3 Parts of assemblies
          • 3.4 Switching devices
          • 3.5 Parts of a controller
          • 3.6 Operation
          • 3.7 Characteristic quantities
          • 3.101 Fuses
          • 3.203 Index of definitions
        • 4 Controller and Control Center Ratings and Characteristics
          • 4.1 Rated maximum voltage (U)
          • 4.2 Rated insulation level (U), (U)
          • 4.3 Rated frequency (f)
          • 4.4 Rated continuous current and temperature rise
          • 4.5 Rated short-time withstand current (I)
          • 4.6 Rated peak and momentary withstand current
          • 4.7 Rated duration of short-circuit (t)
          • 4.8 Rated supply voltage of operating devices and of auxiliary and control circuits (U)
          • 4.9 Rated supply frequency of closing and opening devices and of control circuits
          • 4.10 Rated pressure of compressed gas supply for installation and/or operation
          • 4.101 Rated operational current or rated operational power (I)
          • 4.102 Rated duties
          • 4.103 Rated making and breaking capacities
          • 4.104 Utilization category
          • 4.105 Mechanical endurance (standard and optional)
          • 4.106 Electrical endurance
          • 4.107 Coordination with medium-voltage fuses
          • 4.108 Types and characteristics of automatic change-over devices and automatic acceleration control devices
          • 4.109 Types and characteristics of autotransformers or reactors
          • 4.110 Types and characteristics of the starting resistors for rheostatic motor starters
          • 4.111 Characteristics dependent on starter type
          • 4.112 Rated capacitive switching currents
          • 4.201 Characteristics of Class E2 controllers
          • 4.202 Fault-interrupting rating
          • 4.203 Control center short-circuit rating
          • 4.204 Starting duty of reduced-voltage starters
        • 5 Design and Construction
          • 5.1 Requirements for liquids
          • 5.2 Requirements for gases
          • 5.3 Provisions for protective grounding
          • 5.4 Auxiliary and control equipment
          • 5.5 Dependent power operation
          • 5.6 Stored energy operation
          • 5.7 Independent manual operation
          • 5.8 Operation of releases
          • 5.9 Low- and high-pressure interlocking and monitoring devices
          • 5.10 Markings
          • 5.11 Interlocks
          • 5.12 Position indication
          • 5.13 Degrees of protection (optional)
          • 5.14 Spacings
          • 5.15 Gas and vacuum tightness
          • 5.16 Liquid tightness
          • 5.17 Flammability
          • 5.18 Electromagnetic compatibility
          • 5.19 X-ray emission
          • 5.101 Types of relay or release
          • 5.102 Enclosures
          • 5.201 Latched controllers
          • 5.202 Power circuit isolating means
          • 5.203 Equipment protection
          • 5.204 Service equipment
          • 5.205 Internal wiring
          • 5.206 Terminals and connections
          • 5.207 Bus bar connections
          • 5.208 Connector and grounding kits
          • 5.209 Insulating material
          • 5.210 Wire-bending space for field-installed conductors
          • 5.211 Field-installed accessories (kits)
          • 5.212 Blank spaces, provision for future controllers, and spare controllers
          • 5.213 Insulated bus (optional)
          • 5.214 Controllers – general requirements
        • 6 Type Tests
          • 6.1 General
          • 6.2 Dielectric tests
          • 6.3 Radio interference voltage (RIV) test
          • 6.4 Resistance measurement
          • 6.5 Temperature-rise tests
          • 6.6 Short-time, momentary, and peak withstand current bus tests
          • 6.101 Mechanical tests
          • 6.102 Make and break capacity
          • 6.103 Overload test
          • 6.104 Fault interruption test
          • 6.105 Verification of operating limits and characteristics of overload relays
          • 6.106 Verification of coordination with SCPDs
          • 6.107 Electrical endurance tests
          • 6.108 Motor switching tests
          • 6.109 Capacitive current switching tests
          • 6.201 Switching capacity test – isolating means
          • 6.202 Short-time capability
          • 6.203 Driven rain test
          • 6.204 Mechanical tests of viewing panes
          • 6.205 Enclosure ground integrity test
          • 6.206 Shutter integrity test
          • 6.207 Rod entry test
        • 7 Routine Tests
          • 7.1 Power-frequency voltage withstand test on the main circuit
          • 7.2 Power-frequency voltage withstand test on auxiliary and control circuits
          • 7.3 Measurement of the resistance of the main circuit
          • 7.4 Tightness test (vacuum integrity test)
          • 7.5 Design and visual checks
          • 7.101 Operating tests
          • 7.102 Tests dependent on controller type
          • 7.201 Routine tests – general
    • Annex A (Normative) – References
    • Annex B (Reserved)
    • Annex C (Informative) – Markings required to be translated and suggested French and Spanish translations
    • Annex D (Informative) – Standards for components
    • Annex E (Normative) - Voltage Dividers Used in Medium Voltage Controllers