UL 60947-1
Low-Voltage Switchgear and Controlgear - Part 1: General rules

Edition Number:5SCC Approved:--
Edition Date:2013-07-31DOD Approved: --
Price Code:HANSI Approved: 2019-05-06


    1.1 Scope and object

    This standard applies, when required by the relevant product standard, to switchgear and controlgear hereinafter referred to as "equipment" and intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.

    It does not apply to low-voltage switchgear and controlgear assemblies which are dealt with in IEC 60439.

    NOTE – In certain clauses or subclauses of this standard, the equipment covered by this standard is also referred to as "device", to be consistent with the text of such clauses or subclauses.

    The object of this standard is to state those general rules and requirements which are common to low-voltage equipment as defined in 1.1, including for example:

    – definitions;

    – characteristics;

    – information supplied with the equipment;

    – normal service, mounting and transport conditions;

    – constructional and performance requirements;

    – verification of characteristics and performance.

    Digital inputs and/or digital outputs contained in switchgear and controlgear, and intended to be compatible with programmable controllers (PLCs) are covered by Annex S.

    1.1DV.1 Modification to 1.1 by adding the following:

    1.1DV.1.1 This equipment is intended for installation in accordance with the national installation codes for use in ordinary locations. See Annex dvb, Table dvb.3, Ref. No. 14.

    1.1DV.1.2 “ IEC 60947-2:  Part 2: Circuit-breakers" does not apply. They are covered in Annex dvb, Table dvb.3, Ref. No. 3.

    1.1DV.1.3 “ IEC 60947-3:  Part 3: Switches, disconnectors, switch-disconnectors and fuse combination units” do not apply. They are covered in Annex dvb, Table dvb.3, Ref. No. 1.

    1.1DV.2 Modification to 1.1 by adding 1.1DV.2.1 and 1.1DV.2.2:

    1.1DV.2.1 In Mexico and the United States, with respect to the national installation codes, equipment operating at 600 V and less is considered low-voltage equipment. In Canada, with respect to the national installation codes, equipment operating at more than 750 V is considered high voltage equipment.

    1.1DV.2.2 Enclosed equipment intended for use as service equipment is to comply with the applicable requirements in this standard and with Annex dvb, Table dvb.3, Ref. No. 7. In Mexico, this requirement does not apply.

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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
    • Deviations
    • IEC Foreword
        • 1 General
          • 1.1 Scope and object
          • 1.2 Normative references
        • 2 Definitions
          • 2.1 General terms
          • 2.2 Switching devices
          • 2.3 Parts of switching devices
          • 2.4 Operation of switching devices
          • 2.5 Characteristic quantities
          • 2.6 Tests
          • 2.7 Ports
        • 3 Classification
        • 4 Characteristics
          • 4.1 General
          • 4.2 Type of equipment
          • 4.3 Rated and limiting values for the main circuit
          • 4.4 Utilization category
          • 4.5 Control circuits
          • 4.6 Auxiliary circuits
          • 4.7 Relays and releases
          • 4.8 Co-ordination with short-circuit protective devices (SCPD)
          • 4.9 Switching overvoltages
        • 5 Product information
          • 5.1 Nature of information
          • 5.2 Marking
          • 5.3 Instructions for installation, operation and maintenance
        • 6 Normal service, mounting and transport conditions
          • 6.1 Normal service conditions
          • 6.2 Conditions during transport and storage
          • 6.3 Mounting
        • 7 Constructional and performance requirements
          • 7.1 Constructional requirements
          • 7.1.4DV.1 General
          • 7.1.4DV.2 Isolation devices
          • 7.1.4DV.3 Clamped joint test
          • 7.2 Performance requirements
          • 7.3 Electromagnetic compatibility (EMC)
        • 8 Tests
          • 8.1 Kinds of test
          • 8.2 Compliance with constructional requirements
          • 8.3 Performance
          • 8.3.6DV.1 Breakdown of components test
          • 8.4 Tests for EMC
    • Annex A(informative)Examples of utilization categories for low-voltage switchgear and controlgear
    • Annex B(informative)Suitability of the equipment when conditions for operation in service differ from the normal conditions
    • Annex C (normative)Degrees of protection of enclosed equipment
    • Annex D(informative)Examples of terminals
    • Annex E(informative)Description of a method for adjusting the load circuit
    • Annex F(informative)Determination of short-circuit power-factor or time-constant
    • Annex G(informative)Measurement of creepage distances and clearances
    • Annex H(informative)Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of equipment
    • Annex J(informative)Items subject to agreement between manufacturer and user
    • Annex K
    • Annex L (normative)Terminal marking and distinctive number
    • Annex M(normative)Flammability test
    • Annex N(normative)Requirements and tests for equipment with protective separation
    • Annex O(informative)Environmental aspects
    • Annex P (informative)Terminal lugs for low voltage switchgear and controlgear connected to copper conductors
    • Annex Q(normative)Special tests – Damp heat, salt mist, vibration and shock
    • Annex R(informative)Application of the metal foil for dielectric testing on accessible parts during operation or adjustment
    • Annex S(normative)Digital inputs and outputs
    • Bibliography
    • Annex DVA(informative)
    • ANNEX DVB(normative)Standard references
    • Annex DVC(normative)Secondary Circuits and Circuits Supplied by Battery
    • Annex DVD(normative)Short-Circuit Test Circuit Calibration and Measurement Techniques