IEC 60352-7:2002 pdf download

IEC 60352-7:2002 pdf download.Solderless connections -Part 7:
Spring clamp connections – General requirements, test methodsand practical guidance.
4 Requirements
4.1 Workmanship
The connection shall be processed in a careful and workmanlike manner, in accordance with good current practice.
4.2 Tools
Tools, if necessary, shall be used and inspected according to the instructions given by the manufacturer.
4.3 SprIng-clamp terminations
4.3.1 Materials
— Materials for the current-carrying parts:
suitable grades of copper or copper alloy shall be used.
— Materials for the spring-clamp parts:
suitable grades of copper alloy or steel shall be used.
4.3.2 Surface finishes
The contact area of the current-carrying parts shall be plated with tin or tin-alloy.
The surface shall be tree of detrimental contamination or corrosion.
4.4 Design features
Spring-clamp terminations shall be designed so that the spring-clamp parts establish a sufficient force to produce a reliable connection
In a spring-clamp connecting device, each conductor shell be clamped individually. The openings for use of a tool intended to assist the insertion or withdrawal of the conductor shall be clearly distinguishable from the conductors entry hole.
Dimensions
The suitability of a spring clamp connection depends on the dimensions of the termination together with the characteristics of the materials used.
The dimensions shall be chosen so as to be suitable for the wire or the range of wires fOr which the termination is designed
The suitability is verified by applying the test schedules given in clause 5.
4.5 Wires
Wires with solid, stranded and flexible conductors according to IEC 60228 or IEC 601893 shall be used depending on the type of spring-clamp terminations.
4.5.1 Materials
The conductor used shall be made of annealed copper.
4.5.2 Dimensions
Wires with the following dimensions shall be used:
— solid wires of 0,32 mm to 3,7mm nominal diameter (008 mm2 to 10 mm2 cross-section), or
— stranded wires of 008 mm2 to 10 mm2 cross-section, or
— flexible wires of 008 mm2 to 10 mm2 cross-section.
4.5.3 Surface fInishes
The conductor shall be unpiated or plated with tin or tin-alloy.
The conductor surface shall be free of conta,mnatlon and corrosion which degrades
performance.
4.5.4 WIre Insulation
The insulation shall be capable of being readily stripped from the conductor without changing the physical characteristics of the conductor or strands.
4.6 Spring-clamp connections
a) The combination of wire and spring-clamp termination shall be compatible.
b) The wire shall be stripped to the correct length specified by the manufacturer. The stripped part of the conductor shall not be damaged and shall be clean and free from particles of Insulation.
C) The conductor shall be correctly located In the spring-clamp termination at the correct depth specified by the manufacturer.
All strands of the wire shall be within the spring-clamp termination.
5 Tests
5.1 Testing
5.1.1 General
As explained in the introduction, there are two test schedules which shall be applied according to the following conditions:
— spring-clamp connections which conform to all the requirements of clause 4 shall be tested in accordance with and meet the requirements of the basic test schedule, see 5.3.2;
— spring-clamp connections which do not fully conform to all the requirements of clause 4. for example which are made with different wire types and/or termination sizes and/or materials. shall be tested and meet the requirements of the full test schedule given in 5.3.3.
5.1.2 Standard conditions for testing
Unless otherwise specified, all tests shall be carried out under standard conditions for testing as specified In IEC 60512-1.
The ambient temperature and the relative humidity at which the measurements are made shall be stated in the test report.
In case of dispute about test results, the test shall be repeated at one of the referred conditions of IEC 60068-1.
5.1.3 Preconditioning
Where specified, the connections shall be preconditioned under standard conditions for testing For a period of 24 h. In accordance with IEC 60512-1.
5.1.4 Recovery
Where specified, the specimen shall be allowed to recover under standard conditions for testing for a period of 1 h to 2 h, after conditioning.
5.1.5 Mounting of specimen
a) When mounting is required in a test, the specimens shall be mounted using the normal mounting method, unless otherwise specifled
b) Each test specimen shall consist of one spring-clamp connection prepared as required in the test schedules
NOTE When more lest specimens are requited, they may be pail 01 the same tnuitipde spring.cLarnp conisecting devices
5.2 Test methods and test requirements
NOTE As tar as lest m01hods are described in this standard, its atended that Lb. description will be replaced by a reVerence to the appropriate part 01 IEC 60512 as soon as the relevant lest method is included in PEC 60512. 1EC 60512-I-tOO contains a list 01 test methods and the relevant parts 01 the EC 60512 senes.