UL 2161
Standard for Neon Transformers and Power Supplies

DETAILS
Edition Number:2SCC Approved:--
Edition Date:2016-04-06DOD Approved: --
Price Code:AANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 This standard applies to transformers and power supplies, including those intended to be connected to a Class 2 source of supply, that provide the voltage and ballasting for neon and cold-cathode tubing (electric-discharge tubing) consisting of electrodes and gas such as neon, mercury, helium, argon, and similar gases, enclosed in glass. Neon transformers and power supplies for use in signs and outline lighting are intended to be used in accordance with Article 600 of the National Electrical Code, NFPA 70. Cold-cathode supplies identified for use only in cold-cathode lighting systems are intended to be used in accordance with Article 410 of the National Electrical Code.

    1.2 Neon transformers and power supplies covered by this standard are designated by their construction and intended use as specified in Table 1.1.

    1.3 The following neon supplies are only covered as components for use in an end product that is determined to comply with the Standard for Electric Signs, UL 48:

    a)    Type 1 neon supplies;

    b)    Types 5 and 6 neon supplies when complying with Exception No. 3 to 23.1;

    c)    Types 6, 7, and 8 neon supplies when complying with the Exception to 14.4.1 or the Exception to 14.4.3;

    d)    All types of neon supplies having an isolated output when complying with Exception No. 2 to 23.1; and

    e)     Cold-cathode supplies when complying with Exception No. 5 to 23.1.

    1.4 These requirements do not cover transformers or power supplies intended to supply other forms of electric-discharge lighting sources such as fluorescent and high-intensity-discharge lighting. Requirements for fluorescent supply sources are covered in the Standard for Fluorescent-Lamp Ballasts, UL 935, and the requirements for high-intensity-discharge lighting supply sources are covered in the Standard for High-Intensity-Discharge Lamp Ballasts, UL 1029.

    1.5 These requirements do not cover transformers or power supplies that are intended for use with oil burners. The requirements for oil ignition transformers are covered in the Standard for Low Voltage Transformers – Part 1: General Requirements, UL 5085-1 and the Standard for Low Voltage Transformers – Part 2: General Purpose Transformers, UL 5085-2, and for oil ignition power supplies are covered in the Standard for Power Units Other Than Class 2, UL 1012.

    Table 1.1 - Construction type designation

    Core and/or circuitry

    Primary connections

    Secondary connections

    Type designa-tions

    Completely encloseda

    Any part exposedb

    Wiring terminals or leads

    Power supply cord

    Wiring terminals or leads

    Inte-gral recep-tacles

    Type designa-tion number – see numbered footnotes for definition

    Exposed – not in wiring compartment or through conduit fitting

    Unexposed – in wiring compartment or through conduit fitting

    Exposed – not in wiring compartment or through conduit fitting

    Unexposed – in wiring compartment or through conduit fitting

    no

    yes

    yes

    no

    no

    yes

    no

    no

    1

    yes

    no

    yes

    no

    no

    yes

    no

    no

    2

    yes

    no

    no

    yes

    no

    yes

    no

    no

    3

    yes

    no

    no

    yes

    no

    no

    yes

    no

    4

    yes

    no

    no

    yes

    no

    no

    no

    yes

    5

    yes

    no

    no

    no

    yes

    no

    no

    yes

    6

    yes

    no

    no

    no

    yes

    yes

    no

    no

    7

    yes

    no

    no

    no

    yes

    no

    yes

    no

    8

    a – Enclosed is the containment of electrical parts in a material that complies with 7.1.

    b – Exposed is any current carrying part other than input and output leads or terminals that is not contained in accordance with 7.1.

    Type 1 – Open core-and-coil transformer or open power supply that requires a complete enclosure in the end product.

    Type 2 – Neon supply with the input and output terminals, leads, and connections enclosed in the end product.

    Type 3 – Neon supply with input leads or terminals enclosed and intended for connection to a permanent wiring system, and with secondary leads or terminals required to be enclosed in the end product.

    Type 4 – Neon supply that is fully enclosed including the output and is intended for connection to a permanent wiring system.

    Type 5 – Neon supply that is fully enclosed and intended for connection to a permanent wiring system, and is provided with integral output receptacles.

    Type 6 – Cord-connected neon supply provided with integral output receptacles.

    Type 7 – Cord-connected neon supply with secondary output leads or terminals needing to be enclosed in the end product.

    Type 8 – Cord-connected neon supply with enclosed output leads or terminals.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • PART 1 – ALL NEON SUPPLIES
          • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Reference Publications
          • 4 Units of Measurement
          • 5 Terminology
          • 6 Glossary
          • CONSTRUCTION
          • 7 Enclosures
            • 7.1 General
            • 7.2 Metallic enclosure
            • 7.3 Corrosion protection
            • 7.4 Polymeric enclosure
          • 8 Accessibility Barriers
          • 9 Openings and Open Holes
          • 10 Securement of Parts
          • 11 Sharp Edges
          • 12 Mounting
          • 13 User Accessible Controls
          • 14 Supply Connections (Does Not Include Equipment Grounding)
            • 14.1 Permanently-connected supplies
            • 14.2 Supply terminals
            • 14.3 Supply leads
            • 14.4 Cord- and plug-connected supplies
            • 14.5 Source of supply other than a branch circuit
          • 15 Equipment Grounding
          • 16 Equipment Grounding Means
            • 16.1 General
            • 16.2 Grounding terminal
            • 16.3 Grounding leads
            • 16.4 Grounding, cord-connected neon supplies
          • 17 Bonding
          • 18 Internal Wiring
            • 18.1 General
            • 18.2 Prevention of wire damage
          • 19 Internal Electrical Connections (Other Than Output Circuitry)
          • 20 Output
            • 20.1 Output ratings
            • 20.2 Output terminals
            • 20.3 Output cables
          • 21 Input/Output Isolation
          • 22 Electrical Components
            • 22.1 General
            • 22.2 Switches
            • 22.3 Over-current protection
            • 22.4 Capacitors
            • 22.5 Transformers
            • 22.6 Thermal protective devices
            • 22.7 Printed-wiring boards
            • 22.8 Electrode receptacles
          • 23 Secondary Ground-Fault Protection
          • 24 Spacings
          • 25 Insulation
          • PERFORMANCE
          • 26 General
          • 27 Input Measurement Test
          • 28 Isolated Output Determination Test
          • 29 Output Measurement Tests
            • 29.1 Maximum output voltage
            • 29.2 Maximum output current measurement
          • 30 Temperature Test
          • 31 Dielectric Voltage-Withstand Tests
            • 31.1 General
            • 31.2 Primary and secondary circuits
            • 31.3 Barrier and insulating materials
          • 32 Leakage Current Test
          • 33 Input to Output Isolation Test
          • 34 Grounding Continuity Test
          • 35 Strain and Push-Back Relief Test
          • 36 Switch Loading Tests
            • 36.1 General
            • 36.2 Overload
            • 36.3 Endurance
          • 37 Abnormal Operation Tests
            • 37.1 General
            • 37.2 Output open-circuit
            • 37.3 Abnormal component short- and open-circuit
            • 37.4 Output short-circuit abnormal temperature test
            • 37.5 Output shorted-to-ground abnormal test
          • 38 Printed-Wiring Board Tests
            • 38.1 Abnormal trace-to-trace short-circuit
            • 38.2 Conformal coating
          • 39 Mechanical Tests
            • 39.1 Polymeric mounting means load
            • 39.2 Knockout
          • 40 Wire-Binding Screw Terminal Tests
            • 40.1 Solid-wire tightening
            • 40.2 Performance verification of terminal assemblies on a terminal block
          • 41 Secondary Ground-Fault Parameters Test
          • 42 Secondary Ground-Fault Protection Circuit Abnormal Tests
            • 42.1 General
            • 42.2 Component fault
            • 42.3 Thermal aging
            • 42.4 Overvoltage and undervoltage
            • 42.5 Power supply interruption
            • 42.6 Transient surge
            • 42.7 Humidity
          • MANUFACTURING AND PRODUCTION TESTS
          • 43 Production-Line Grounding Continuity Test
          • 44 Production-Line Dielectric Voltage-Withstand Test
          • MARKINGS
          • 45 General
          • 46 Identification
          • 47 Ratings
          • 48 Cautionary Markings
          • INSTRUCTIONS
          • 49 Installation
        • PART 2 – OUTDOOR NEON SUPPLIES
          • NON-WEATHERPROOF NEON SUPPLIES
          • 50 General
          • 51 Construction – Electrical
          • 52 Performance
          • WEATHERPROOF NEON SUPPLIES
          • 53 General
          • 54 Construction – Mechanical, Corrosion Protection
          • 55 Exclusion of Water
            • 55.1 Enclosures
            • 55.2 Gaskets and bushings
            • 55.3 Openings
          • 56 Construction – Electrical
          • PERFORMANCE
          • 57 Accelerated Aging of Gaskets
          • 58 Water Spray
          • MARKINGS
          • 59 General
    • APPENDIX A