• UL 1008A : 2

    Current The latest, up-to-date edition.

    TRANSFER SWITCH EQUIPMENT, OVER 1000 VOLTS

    Available format(s):  Hardcopy

    Language(s): 

    Published date:  05-09-2017

    Publisher:  Underwriters Laboratories

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    Table of Contents - (Show below) - (Hide below)

    PREFACE
    INTRODUCTION
    1 Scope
    2 General Requirements
    3 Units of Measurement
    4 Reference Publications
    5 Definitions
    CONSTRUCTION
    6 General
    7 Enclosure
    8 Insulating Material
    9 Mounting of Parts
    10 Guarding and Accessibility of Live Parts
    11 Current-Carrying Parts
    12 Field Wiring Terminals for Control Circu
    13 Internal Wiring
    14 Isolation
    15 Grounding and Bonding
    16 Operating Mechanism
    17 Overcurrent and Ground-Fault Protection
    18 Receptacles
    19 Spacings
    20 Wiring Space
    21 Interlocking
    22 Transfer Switches for Service Equipment Use - Requirements
       for All Countries
    23 Service Equipment for Use in the United States
    24 Service Equipment for Use in Canada
    25 Transfer Switches Comprised of Circuit Breakers in Switchgear
    26 Transfer Switches Comprised of Contactors
    27 Transfer Switches Comprised of Load Interrupter Switches in
       Metal Enclosed Switchgear
    PERFORMANCE
    28 General
    29 Transfer Switches Comprised of Circuit Breakers in Switchgear
    30 Transfer Switches Comprised of Contactors
    31 Transfer Switches Comprised of Load Interrupting Switches
       in Metal Enclosed Switchgear
    32 Other Transfer Switches
    33 Operations Tests
    34 Overvoltage Test
    35 Undervoltage Test
    36 Range of Operating Voltages
    37 Overload Test
    38 Electrical Endurance Test
    39 Temperature Test
    40 Mechanical Endurance Tests
    41 Dielectric Voltage-Withstand Test
    42 Partial Discharge Testing Procedures
    43 Dielectric Voltage-Withstand Test (Repeated)
    44 Withstand Test
    45 Closing Test
    electric Voltage-Withstand Test (Reduced Level)
    49 Switching Capacity Test - Isolating Means
    50 Isolating Means Interlock Integrity Test
    51 Transfer Switch Operator Interlock Integrity Test
    52 Impulse Voltage Withstand Tests
    53 Enclosure Ground Integrity Test
    RATINGS
    54 Ratings
    MANUFACTURING AND PRODUCTION TESTS
    55 Power-Frequency Voltage Withstand Test
    MARKINGS
    56 Markings
    57 Service Equipment Markings
    58 Permanence of Marking
    59 Installation Test Procedures
    60 Transfer Switches for Fire Pump Service
    Annex A (informative) - Standards for Components
    Annex B (normative) - References
    ANNEX C (normative) - Bypass Transfer Switches
    ANNEX D (informative) - French Translations of Markings

    Abstract - (Show below) - (Hide below)

    The revision of ANSI/UL 1008A dated April 30, 2020 includes the following changes in requirements: – Clarification of required frequencies for tests; 33.1.1, 37.4, 41.1, 44.5, 47.2.1, 47.2.3, 49.3, 54.3 – Correction to electrical endurance requirements; Table 7

    Scope - (Show below) - (Hide below)

    These requirements cover automatic, non-automatic, and manual transfer switches, operating at voltages of greater than 1000 Vac, and intended for use in non-hazardous locations in accordance with Annex B, Item 1, the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, CSA C22.1, Part 1, to provide for power as follows: a)Automatic transfer switches for use in emergency systems in: 1)Emergency systems in accordance with the Standard for Emergency Electrical Power Supply for Buildings, CSA C282-15; 2)Health care facilities in accordance with Rule 24-304 of the Canadian Electrical Code (CEC) Part I; 3)Articles 517, Health Care Facilities, and 700, Emergency Systems, of the National Electrical Code, ANSI/NFPA 70 (refer to Annex B, Item 1); and 4)The Health Care Facilities Code, ANSI/NFPA 99, (refer to Annex B, Item 12).

    General Product Information - (Show below) - (Hide below)

    Development Note Also numbered as CSA C22.2.178.3. (09/2017) NEW CHILD REV 1 2020 IS ADDED
    Document Type Standard
    Product Note NEW CHILD REV 1 2020 IS ADDED
    Publisher Underwriters Laboratories
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    UL 4248-17 : 1 FUSEHOLDERS - PART 17: CLASS CF FUSES
    UL 1077 : 7 SUPPLEMENTARY PROTECTORS FOR USE IN ELECTRICAL EQUIPMENT
    UL 98 : 2016 ENCLOSED AND DEAD-FRONT SWITCHES
    UL 5085-2 : 1 LOW VOLTAGE TRANSFORMERS - PART 2: GENERAL PURPOSE TRANSFORMERS
    UL 4248-1 : 1 FUSEHOLDERS - PART 1: GENERAL REQUIREMENTS
    UL 4248-5 : 1 FUSEHOLDERS - PART 5: CLASS G
    CSA C22 NO. 4 : 2016 ENCLOSED AND DEAD-FRONT SWITCHES
    UL 50E : 2 ENCLOSURES FOR ELECTRICAL EQUIPMENT, ENVIRONMENTAL CONSIDERATIONS
    IEEE C37.013 : 1997 AC HIGH-VOLTAGE CIRCUIT BREAKERS RATED ON A SYMMETRICAL CURRENT BASIS
    UL 514A:11ED 2013-02 Metallic Outlet Boxes
    UL 50 : 2015 ENCLOSURES FOR ELECTRICAL EQUIPMENT, NON-ENVIRONMENTAL CONSIDERATIONS
    CSA C22.2 No. 5 : 2013 MOLDED-CASE CIRCUIT BREAKERS, MOLDED-CASE SWITCHES AND CIRCUIT-BREAKER ENCLOSURES
    UL 5085-3 : 1 LOW VOLTAGE TRANSFORMERS - PART 3: CLASS 2 AND CLASS 3 TRANSFORMERS
    CSA C22.2 No. 29 : 2015 PANELBOARDS AND ENCLOSED PANELBOARDS
    C22.1-15 Canadian Electrical Code, Part I (23rd Edition), Safety Standard for Electrical Installations
    IEEE C37.100.1 : 2007 COMMON REQUIREMENTS FOR HIGH VOLTAGE POWER SWITCHGEAR RATED ABOVE 1000 V
    CSA C22.2 No. 0.4 : 2004(R2013) BONDING OF ELECTRICAL EQUIPMENT
    UL 248-8 : 3 LOW-VOLTAGE FUSES - PART 8: CLASS J FUSES
    UL 4248-11 : 1 FUSEHOLDERS - PART 11: TYPE C (EDISON BASE) AND TYPE S PLUG FUSE
    UL 347 : 6 MEDIUM-VOLTAGE AC CONTACTORS, CONTROLLERS, AND CONTROL CENTRES
    IEEE C37.20.2 : 2015 METAL-CLAD SWITCHGEAR
    CSA C22.2 No. 144 : 1991 GROUND FAULT CIRCUIT INTERRUPTERS
    CSA C22.2 No. 0.2 : 2016 INSULATION COORDINATION
    UL 746C : 6 POLYMERIC MATERIALS - USE IN ELECTRICAL EQUIPMENT EVALUATIONS
    CSA C22.2 No. 31 : 2014 SWITCHGEAR ASSEMBLIES
    UL 943 : 5 GROUND-FAULT CIRCUIT-INTERRUPTERS
    UL 4248-12 : 1 FUSEHOLDERS - PART 12: CLASS R
    UL 489 : 2013 MOLDED-CASE CIRCUIT BREAKERS, MOLDED-CASE SWITCHES, AND CIRCUIT-BREAKER ENCLOSURES
    UL 4248-9 : 1 FUSEHOLDERS - PART 9: CLASS K
    UL 969 : 5 MARKING AND LABELING SYSTEMS
    UL 758 : 3 APPLIANCE WIRING MATERIAL
    UL 508 : 1999 INDUSTRIAL CONTROL EQUIPMENT
    UL 514C : 4 NONMETALLIC OUTLET BOXES, FLUSH-DEVICE BOXES, AND COVERS
    UL 5085-1 : 1 LOW VOLTAGE TRANSFORMERS - PART 1: GENERAL REQUIREMENTS
    UL 67 : 2009 PANELBOARDS
    CSA C22.2 No. 65 : 2013 WIRE CONNECTORS
    UL 248-12:3ED 2011-05 Low-Voltage Fuses - Part 12: Class R Fuses
    IEEE C37.20.3 : 2013 METAL-ENCLOSED INTERRUPTER SWITCHGEAR (1 KV-38 KV)
    IEEE C37.20.4 : 2013 INDOOR AC SWITCHES (1 KV TO 38 KV) FOR USE IN METAL-ENCLOSED SWITCHGEAR
    UL 796 : 2011 PRINTED-WIRING BOARDS
    UL 248-4 : 2 LOW-VOLTAGE FUSES - PART 4: CLASS CC FUSES
    IEEE C37.40 : 2003 STANDARD SERVICE CONDITIONS AND DEFINITIONS FOR HIGH-VOLTAGE FUSES, DISTRIBUTION ENCLOSED SINGLE-POLE SWITCHES, FUSE DISCONNECTING SWITCHES, AND ACCESSORIES
    CSA C22.2 No. 0.15 : 2015 ADHESIVE LABELS
    NFPA 99 : 2018 HEALTH CARE FACILITIES CODE
    CSA C22.2 No. 263 : 2015 FIRE PUMP CONTROLLERS
    NFPA 70 : 2017 NATIONAL ELECTRICAL CODE
    UL 248-10 : 3 LOW-VOLTAGE FUSES - PART 10: CLASS L FUSES
    IEEE C37.09 : 1999 TEST PROCEDURE FOR AC HIGH-VOLTAGE CIRCUIT BREAKERS RATED ON A SYMMETRICAL CURRENT BASIS
    CSA C22.2 No. 210 : 2015 APPLIANCE WIRING MATERIAL PRODUCTS
    UL 991 : 3 TESTS FOR SAFETY-RELATED CONTROLS EMPLOYING SOLID-STATE DEVICES
    C22.2 NO. 4248.1-17 Fuseholders Part 1: General requirements (Trinational standard with UL 4248-1 and NMX-J-009/4248/1-ANCE)
    UL 248-1 : 3 LOW-VOLTAGE FUSES - PART 1: GENERAL REQUIREMENTS
    UL 486A : 9ED REV MAY 2001 WIRE CONNECTORS AND SOLDERING LUGS FOR USE WITH COPPER CONDUCTORS
    UL 1059 : 4 TERMINAL BLOCKS
    UL 4248-6 : 1 FUSEHOLDERS - PART 6: CLASS H
    UL 4248-15 : 1 FUSEHOLDERS - PART 15: CLASS T
    UL 4248-4 : 1 FUSEHOLDERS - PART 4: CLASS CC
    CSA C22.2 No. 14 : 2013 INDUSTRIAL CONTROL EQUIPMENT
    CSA C22.2 No. 253 : 2016 MEDIUM-VOLTAGE AC CONTACTORS, CONTROLLERS, AND CONTROL CENTRES
    UL 4248-8 : 1 FUSEHOLDERS - PART 8: CLASS J
    CSA C22.2 No. 144.1 : 2016 GROUND-FAULT CIRCUIT-INTERRUPTERS
    C282-15 Emergency electrical power supply for buildings
    NFPA 20 : 2016 INSTALLATION OF STATIONARY PUMPS FOR FIRE PROTECTION
    UL 248-5 : 2 LOW-VOLTAGE FUSES - PART 5: CLASS G FUSES
    CSA C22.2 No. 94.2 : 2015 ENCLOSURES FOR ELECTRICAL EQUIPMENT, ENVIRONMENTAL CONSIDERATIONS
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